UIView bottom border

Question

To a UIScrollView  toScrollView  which is the width of the screen   I want to add a gray bottom border  exactly like that of the to-field of the compose view of the iPhone s native Messages app    To achieve this  I followed Cocoa Touch  How To Change UIView  39 s Border Color And Thickness  and just covered the top border with  the custom UINavigationBar and made the toScrollView s x-coordinate -1  amp  width 322 so that the left  amp  right borders are just off screen   This looks fine  but it s sort of a hack  and I was wondering if there s a better way to do this   -  void viewDidLoad        super viewDidLoad           Add UINavigationBar  navigationBar at top      self navigationItem leftBarButtonItem     UIBarButtonItem alloc                                               initWithBarButtonSystemItem UIBarButtonSystemItemCancel                                              target self action  selector cancelAction        UINavigationBar  navigationBar     UINavigationBar alloc                                        initWithFrame CGRectMake 0 0f  0 0f  320 0f  44 0f        navigationBar items    NSArray arrayWithObject self navigationItem           Add UIScrollView  toScrollView below navigationBar      UIScrollView  toScrollView     UIScrollView alloc                                    initWithFrame CGRectMake -1 0f  43 0f  322 0f  45 0f        toScrollView backgroundColor    UIColor whiteColor       toScrollView layer borderColor    UIColor colorWithWhite 0 8f alpha 1 0f  CGColor      toScrollView layer borderWidth   1 0f       self view addSubview toScrollView        self view addSubview navigationBar      covers top of toScrollView

User · Answer

There is also improved code with remove border functionality. Based on confile answer.

import UIKit

enum viewBorder: String {
    case Left = "borderLeft"
    case Right = "borderRight"
    case Top = "borderTop"
    case Bottom = "borderBottom"
}

extension UIView {

    func addBorder(vBorder: viewBorder, color: UIColor, width: CGFloat) {
        let border = CALayer()
        border.backgroundColor = color.CGColor
        border.name = vBorder.rawValue
        switch vBorder {
            case .Left:
                border.frame = CGRectMake(0, 0, width, self.frame.size.height)
            case .Right:
                border.frame = CGRectMake(self.frame.size.width - width, 0, width, self.frame.size.height)
            case .Top:
                border.frame = CGRectMake(0, 0, self.frame.size.width, width)
            case .Bottom:
                border.frame = CGRectMake(0, self.frame.size.height - width, self.frame.size.width, width)
        }
        self.layer.addSublayer(border)
    }

    func removeBorder(border: viewBorder) {
        var layerForRemove: CALayer?
        for layer in self.layer.sublayers! {
            if layer.name == border.rawValue {
                layerForRemove = layer
            }
        }
        if let layer = layerForRemove {
            layer.removeFromSuperlayer()
        }
    }

}

Update: Swift 3

import UIKit

enum ViewBorder: String {
    case left, right, top, bottom
}

extension UIView {

    func add(border: ViewBorder, color: UIColor, width: CGFloat) {
        let borderLayer = CALayer()
        borderLayer.backgroundColor = color.cgColor
        borderLayer.name = border.rawValue
        switch border {
        case .left:
            borderLayer.frame = CGRect(x: 0, y: 0, width: width, height: self.frame.size.height)
        case .right:
            borderLayer.frame = CGRect(x: self.frame.size.width - width, y: 0, width: width, height: self.frame.size.height)
        case .top:
            borderLayer.frame = CGRect(x: 0, y: 0, width: self.frame.size.width, height: width)
        case .bottom:
            borderLayer.frame = CGRect(x: 0, y: self.frame.size.height - width, width: self.frame.size.width, height: width)
        }
        self.layer.addSublayer(borderLayer)
    }

    func remove(border: ViewBorder) {
        guard let sublayers = self.layer.sublayers else { return }
        var layerForRemove: CALayer?
        for layer in sublayers {
            if layer.name == border.rawValue {
                layerForRemove = layer
            }
        }
        if let layer = layerForRemove {
            layer.removeFromSuperlayer()
        }
    }

}

User · Answer

I wrote a general method that will add a border on whichever sides you wish in any UIView   You can define thickness  color  margins and zOrder for each side       view  the view to draw border around  thickness  thickness of the border on the given side  color  color of the border on the given side  margin  space between the border s outer edge and the view s frame edge on the given side   zOrder  defines the order to add the borders to the view   The borders will be added by zOrder from lowest to highest  thus making the highest priority border visible when two borders overlap at the corners            void  drawBorderAroundUIView  UIView    view thicknessLeft  CGFloat  thicknessLeft colorLeft  UIColor   colorLeft marginLeft  CGFloat  marginLeft zOrderLeft  int  zOrderLeft thicknessRight  CGFloat  thicknessRight colorRight  UIColor   colorRight marginRight  CGFloat  marginRight zOrderRight  int  zOrderRight thicknessTop  CGFloat  thicknessTop colorTop  UIColor   colorTop marginTop  CGFloat  marginTop zOrderTop  int  zOrderTop thicknessBottom  CGFloat  thicknessBottom colorBottom  UIColor   colorBottom marginBottom  CGFloat  marginBottom zOrderBottom  int  zOrderBottom        make margins be the outside edge and make positive margin represent a smaller rectangle     marginBottom   -1   marginBottom - thicknessBottom      marginTop   -1   marginTop - thicknessTop      marginLeft   -1   marginLeft - thicknessLeft      marginRight   -1   marginRight - thicknessRight         get reference points for corners     CGPoint upperLeftCorner   CGPointZero      CGPoint lowerLeftCorner   CGPointMake upperLeftCorner x  upperLeftCorner y   view frame size height       CGPoint upperRightCorner   CGPointMake upperLeftCorner x   view frame size width  upperLeftCorner y          left     CALayer  leftBorder    CALayer layer       leftBorder frame   CGRectMake upperLeftCorner x - thicknessLeft - marginLeft  upperLeftCorner y - thicknessTop - marginTop  thicknessLeft  view frame size height   marginTop   marginBottom   thicknessBottom   thicknessTop       leftBorder backgroundColor   colorLeft CGColor         right     CALayer  rightBorder    CALayer layer       rightBorder frame   CGRectMake upperRightCorner x   marginRight  upperRightCorner y - thicknessTop - marginTop  thicknessRight  view frame size height   marginTop   marginBottom   thicknessBottom   thicknessTop       rightBorder backgroundColor   colorRight CGColor         top     CALayer  topBorder    CALayer layer       topBorder frame   CGRectMake upperLeftCorner x - thicknessLeft - marginLeft  upperLeftCorner y - thicknessTop - marginTop  view frame size width   marginLeft   marginRight   thicknessLeft   thicknessRight  thicknessTop       topBorder backgroundColor   colorTop CGColor         bottom     CALayer  bottomBorder    CALayer layer       bottomBorder frame   CGRectMake upperLeftCorner x - thicknessLeft - marginLeft  lowerLeftCorner y   marginBottom  view frame size width   marginLeft   marginRight   thicknessLeft   thicknessRight  thicknessBottom       bottomBorder backgroundColor   colorBottom CGColor         define dictionary keys to be used for adding borders in order of zOrder     NSString  borderDK     border       NSString  zOrderDK     zOrder          storing borders in dictionaries in preparation to add them in order of zOrder     NSDictionary  leftBorderDictionary    NSDictionary dictionaryWithObjectsAndKeys leftBorder  borderDK   NSNumber numberWithInt zOrderLeft   zOrderDK  nil       NSDictionary  rightBorderDictionary    NSDictionary dictionaryWithObjectsAndKeys rightBorder  borderDK   NSNumber numberWithInt zOrderRight   zOrderDK  nil       NSDictionary  topBorderDictionary    NSDictionary dictionaryWithObjectsAndKeys topBorder  borderDK   NSNumber numberWithInt zOrderTop   zOrderDK  nil       NSDictionary  bottomBorderDictionary    NSDictionary dictionaryWithObjectsAndKeys bottomBorder  borderDK   NSNumber numberWithInt zOrderBottom   zOrderDK  nil        NSMutableArray  borders    NSMutableArray arrayWithObjects leftBorderDictionary  rightBorderDictionary  topBorderDictionary  bottomBorderDictionary  nil          add borders in order of zOrder  lowest - gt  highest    Thus the highest zOrder will be added last so it will be on top      while  borders count                  look for the next lowest zOrder border to add         NSDictionary  nextBorderToLayDown    borders objectAtIndex 0           for  int indexOfBorder   0  indexOfBorder  lt  borders count  indexOfBorder                          NSDictionary  borderAtIndex    borders objectAtIndex indexOfBorder               if    borderAtIndex objectForKey zOrderDK  intValue   lt    nextBorderToLayDown objectForKey zOrderDK  intValue                                 nextBorderToLayDown   borderAtIndex                                    add the border to the view          view layer addSublayer  nextBorderToLayDown objectForKey borderDK             borders removeObject nextBorderToLayDown

User · Answer

extension UIView      func addBottomLine color  UIColor  height  CGFloat         let bottomView   UIView frame  CGRect x  0  y  self frame height - 1  width  self frame width  height  height       bottomView translatesAutoresizingMaskIntoConstraints   false     bottomView autoresizingMask    flexibleWidth     bottomView backgroundColor   color     self addSubview bottomView

User · Answer

Here is a more generalized Swift extension to create border for any UIView subclass    import UIKit  extension UIView           func addTopBorderWithColor color  UIColor  width  CGFloat        let border   CALayer       border backgroundColor   color CGColor     border frame   CGRectMake 0  0  self frame size width  width      self layer addSublayer border         func addRightBorderWithColor color  UIColor  width  CGFloat        let border   CALayer       border backgroundColor   color CGColor     border frame   CGRectMake self frame size width - width  0  width  self frame size height      self layer addSublayer border         func addBottomBorderWithColor color  UIColor  width  CGFloat        let border   CALayer       border backgroundColor   color CGColor     border frame   CGRectMake 0  self frame size height - width  self frame size width  width      self layer addSublayer border         func addLeftBorderWithColor color  UIColor  width  CGFloat        let border   CALayer       border backgroundColor   color CGColor     border frame   CGRectMake 0  0  width  self frame size height      self layer addSublayer border          Swift 3  extension UIView       func addTopBorderWithColor color  UIColor  width  CGFloat            let border   CALayer           border backgroundColor   color cgColor         border frame   CGRect x  0  y  0  width  self frame size width  height  width          self layer addSublayer border             func addRightBorderWithColor color  UIColor  width  CGFloat            let border   CALayer           border backgroundColor   color cgColor         border frame   CGRect x  self frame size width - width  y  0  width  width  height  self frame size height          self layer addSublayer border             func addBottomBorderWithColor color  UIColor  width  CGFloat            let border   CALayer           border backgroundColor   color cgColor         border frame   CGRect x  0  y  self frame size height - width  width  self frame size width  height  width          self layer addSublayer border             func addLeftBorderWithColor color  UIColor  width  CGFloat            let border   CALayer           border backgroundColor   color cgColor         border frame   CGRect x  0  y  0  width  width  height  self frame size height          self layer addSublayer border

User · Answer

Swift 4 extension with border width and color  Works great    IBDesignable final class SideBorders  UIView    IBInspectable var topColor  UIColor   UIColor clear  IBInspectable var topWidth  CGFloat   0   IBInspectable var rightColor  UIColor   UIColor clear  IBInspectable var rightWidth  CGFloat   0   IBInspectable var bottomColor  UIColor   UIColor clear  IBInspectable var bottomWidth  CGFloat   0   IBInspectable var leftColor  UIColor   UIColor clear  IBInspectable var leftWidth  CGFloat   0  override func draw   rect  CGRect        let topBorder   CALayer       topBorder backgroundColor   topColor cgColor     topBorder frame   CGRect x  0  y  0  width  self frame size width  height  topWidth      self layer addSublayer topBorder       let rightBorder   CALayer       rightBorder backgroundColor   rightColor cgColor     rightBorder frame   CGRect x  self frame size width - rightWidth  y  0  width  rightWidth  height  self frame size height      self layer addSublayer rightBorder       let bottomBorder   CALayer       bottomBorder backgroundColor   bottomColor cgColor     bottomBorder frame   CGRect x  0  y  self frame size height - bottomWidth  width  self frame size width  height  bottomWidth      self layer addSublayer bottomBorder       let leftBorder   CALayer       leftBorder backgroundColor   leftColor cgColor     leftBorder frame   CGRect x  0  y  self frame size height - leftWidth  width  self frame size width  height  leftWidth      self layer addSublayer leftBorder

User · Answer

Swift 4 3  You can use this solution beneath  It works on UIBezierPaths which are lighter than layers  causing quick startup times  It is easy to use  see instructions beneath   class ResizeBorderView  UIView       var color   UIColor white     var lineWidth  CGFloat   1     var edges    UIRectEdge             didSet               setNeedsDisplay                       override func draw   rect  CGRect            if edges contains  top     edges contains  all               let path   UIBezierPath               path lineWidth   lineWidth             color setStroke               UIColor blue setFill               path move to  CGPoint x  0  y  0   lineWidth   2               path addLine to  CGPoint x  self bounds width  y  0   lineWidth   2               path stroke                     if edges contains  bottom     edges contains  all               let path   UIBezierPath               path lineWidth   lineWidth             color setStroke               UIColor blue setFill               path move to  CGPoint x  0  y  self bounds height - lineWidth   2               path addLine to  CGPoint x  self bounds width  y  self bounds height - lineWidth   2               path stroke                     if edges contains  left     edges contains  all               let path   UIBezierPath               path lineWidth   lineWidth             color setStroke               UIColor blue setFill               path move to  CGPoint x  0   lineWidth   2  y  0               path addLine to  CGPoint x  0   lineWidth   2  y  self bounds height               path stroke                     if edges contains  right     edges contains  all               let path   UIBezierPath               path lineWidth   lineWidth             color setStroke               UIColor blue setFill               path move to  CGPoint x  self bounds width - lineWidth   2  y  0               path addLine to  CGPoint x  self bounds width - lineWidth   2  y  self bounds height               path stroke                        Set your UIView s class to ResizeBorderView Set the color and line width by using yourview color and yourview lineWidth in your viewDidAppear method Set the edges  example  yourview edges     right   left     all   for all Enjoy quick start and resizing borders

User · Answer

Swift   Create UIView extension  private var bottomLineColorAssociatedKey   UIColor    black private var topLineColorAssociatedKey   UIColor    black private var rightLineColorAssociatedKey   UIColor    black private var leftLineColorAssociatedKey   UIColor    black extension UIView     IBInspectable var bottomLineColor  UIColor       get           if let color   objc getAssociatedObject self   amp bottomLineColorAssociatedKey  as  UIColor               return color           else               return  black                 set           objc setAssociatedObject self   amp bottomLineColorAssociatedKey  newValue   OBJC ASSOCIATION RETAIN           IBInspectable var bottomLineWidth  CGFloat       get           return self bottomLineWidth           set           DispatchQueue main async               self addBottomBorderWithColor color  self bottomLineColor  width  newValue                     IBInspectable var topLineColor  UIColor       get           if let color   objc getAssociatedObject self   amp topLineColorAssociatedKey  as  UIColor               return color           else               return  black                 set           objc setAssociatedObject self   amp topLineColorAssociatedKey  newValue   OBJC ASSOCIATION RETAIN           IBInspectable var topLineWidth  CGFloat       get           return self topLineWidth           set           DispatchQueue main async               self addTopBorderWithColor color  self topLineColor  width  newValue                     IBInspectable var rightLineColor  UIColor       get           if let color   objc getAssociatedObject self   amp rightLineColorAssociatedKey  as  UIColor               return color           else               return  black                 set           objc setAssociatedObject self   amp rightLineColorAssociatedKey  newValue   OBJC ASSOCIATION RETAIN           IBInspectable var rightLineWidth  CGFloat       get           return self rightLineWidth           set           DispatchQueue main async               self addRightBorderWithColor color  self rightLineColor  width  newValue                     IBInspectable var leftLineColor  UIColor       get           if let color   objc getAssociatedObject self   amp leftLineColorAssociatedKey  as  UIColor               return color           else               return  black                 set           objc setAssociatedObject self   amp leftLineColorAssociatedKey  newValue   OBJC ASSOCIATION RETAIN           IBInspectable var leftLineWidth  CGFloat       get           return self leftLineWidth           set           DispatchQueue main async               self addLeftBorderWithColor color  self leftLineColor  width  newValue                    func addTopBorderWithColor color  UIColor  width  CGFloat        let border   CALayer       border name    topBorderLayer      removePreviouslyAddedLayer name  border name            border backgroundColor   color cgColor     border frame   CGRect x  0  y   0 width  self frame size width  height  width      self layer addSublayer border      self addObserver self  forKeyPath   keyPath UIView bounds   options   new  context  UnsafeMutableRawPointer bitPattern  1111       func addRightBorderWithColor color  UIColor  width  CGFloat        let border   CALayer       border name    rightBorderLayer      removePreviouslyAddedLayer name  border name            border backgroundColor   color cgColor     border frame   CGRect x  self frame size width - width  y  0  width   width  height  self frame size height      self layer addSublayer border       self addObserver self  forKeyPath   keyPath UIView bounds   options   new  context  UnsafeMutableRawPointer bitPattern  2222       func addBottomBorderWithColor color  UIColor  width  CGFloat        let border   CALayer       border name    bottomBorderLayer      removePreviouslyAddedLayer name  border name            border backgroundColor   color cgColor     border frame   CGRect x  0  y  self frame size height - width width   self frame size width height  width      self layer addSublayer border      self addObserver self  forKeyPath   keyPath UIView bounds   options   new  context  UnsafeMutableRawPointer bitPattern  3333      func addLeftBorderWithColor color  UIColor  width  CGFloat        let border   CALayer       border name    leftBorderLayer      removePreviouslyAddedLayer name  border name            border backgroundColor   color cgColor     border frame   CGRect x 0  y 0 width   width  height   self frame size height      self layer addSublayer border      self addObserver self  forKeyPath   keyPath UIView bounds   options   new  context  UnsafeMutableRawPointer bitPattern  4444      override open func observeValue forKeyPath keyPath  String   of object  Any   change   NSKeyValueChangeKey   Any    context  UnsafeMutableRawPointer          if let objectView   object as  UIView          objectView     self          keyPath     keyPath UIView bounds            switch context           case UnsafeMutableRawPointer bitPattern  1111               for border in self layer sublayers                         if border name     topBorderLayer                        border frame   CGRect x  0  y   0 width  self frame size width  height  border frame height                                          case UnsafeMutableRawPointer bitPattern  2222               for border in self layer sublayers                         if border name     rightBorderLayer                         border frame   CGRect x  self frame size width - border frame width  y  0  width   border frame width  height  self frame size height                                          case UnsafeMutableRawPointer bitPattern  3333               for border in self layer sublayers                         if border name     bottomBorderLayer                        border frame   CGRect x  0  y  self frame size height - border frame height width   self frame size width height  border frame height                                          case UnsafeMutableRawPointer bitPattern  4444               for border in self layer sublayers                         if border name     leftBorderLayer                       border frame   CGRect x 0  y 0 width   border frame width  height   self frame size height                                          default              break                   func removePreviouslyAddedLayer name   String        if self layer sublayers  count    0  gt  0           self layer sublayers  forEach               if  0 name    name                    0 removeFromSuperlayer                                          Objective C  Create category class of UIView  UIView Border h   import  lt UIKit UIKit h gt   import  lt Foundation Foundation h gt   interface UIView  Border     property  nonatomic  IBInspectable UIColor  topLineColor   property  nonatomic  IBInspectable CGFloat topLineWidth   property  nonatomic  IBInspectable UIColor  bottomLineColor   property  nonatomic  IBInspectable CGFloat bottomLineWidth   property  nonatomic  IBInspectable UIColor  rightLineColor   property  nonatomic  IBInspectable CGFloat rightLineWidth   property  nonatomic  IBInspectable UIColor  leftLineColor   property  nonatomic  IBInspectable CGFloat leftLineWidth   -  void addBottomBorderWithColor   UIColor    color andWidth  CGFloat  borderWidth   -  void addLeftBorderWithColor   UIColor    color andWidth  CGFloat  borderWidth   -  void addRightBorderWithColor   UIColor    color andWidth  CGFloat  borderWidth   -  void addTopBorderWithColor   UIColor    color andWidth  CGFloat  borderWidth    end   UIView Border m  static void  topBorderContext    amp topBorderContext  static void  bottomBorderContext    amp bottomBorderContext  static void  leftBorderContext    amp leftBorderContext  static void  rightBorderContext    amp rightBorderContext  static char bottomLineColorKey topLineColorKey rightLineColorKey leftLineColorKey   implementation UIView Utility   dynamic borderColor borderWidth cornerRadius bottomLineWidth topLineWidth rightLineWidth leftLineWidth   - void setBorderColor  UIColor   borderColor       self layer setBorderColor borderColor CGColor      - void setBorderWidth  CGFloat borderWidth       self layer setBorderWidth borderWidth      - void setCornerRadius  CGFloat cornerRadius       self layer setCornerRadius cornerRadius        for Bottom Line -  UIColor   bottomLineColor       return objc getAssociatedObject self   amp bottomLineColorKey     -  void setBottomLineColor  UIColor   bottomLineColor       objc setAssociatedObject self   amp bottomLineColorKey                               bottomLineColor  OBJC ASSOCIATION RETAIN NONATOMIC     - void setBottomLineWidth  CGFloat bottomLineWidth        self addBottomBorderWithColor  self bottomLineColor  andWidth bottomLineWidth        for top Line -  UIColor   topLineColor       return objc getAssociatedObject self   amp topLineColorKey     -  void setTopLineColor  UIColor   topLineColor       objc setAssociatedObject self   amp topLineColorKey                               topLineColor  OBJC ASSOCIATION RETAIN NONATOMIC     -  void setTopLineWidth  CGFloat topLineWidth       self addTopBorderWithColor  self topLineColor  andWidth topLineWidth        for right Line -  UIColor   rightLineColor       return objc getAssociatedObject self   amp rightLineColorKey     - void setRightLineColor  UIColor   rightLineColor       objc setAssociatedObject self   amp rightLineColorKey                               rightLineColor  OBJC ASSOCIATION RETAIN NONATOMIC     - void setRightLineWidth  CGFloat rightLineWidth       self addRightBorderWithColor  self rightLineColor  andWidth rightLineWidth        for left Line - UIColor   leftLineColor       return objc getAssociatedObject self   amp leftLineColorKey     - void setLeftLineColor  UIColor   leftLineColor      objc setAssociatedObject self   amp leftLineColorKey                               leftLineColor  OBJC ASSOCIATION RETAIN NONATOMIC     - void setLeftLineWidth  CGFloat leftLineWidth       self addLeftBorderWithColor  self leftLineColor  andWidth leftLineWidth      -  void addTopBorderWithColor  UIColor   color andWidth  CGFloat  borderWidth       dispatch async dispatch get main queue               CALayer  border    CALayer layer           border name     topBorderLayer            self removePreviouslyAddedLayer border name           border backgroundColor   color CGColor          border frame   CGRectMake 0  0  self frame size width  borderWidth            self layer addSublayer border            self addObserver self forKeyPath    bounds  options NSKeyValueObservingOptionNew context topBorderContext              -  void addBottomBorderWithColor  UIColor   color andWidth  CGFloat  borderWidth       dispatch async dispatch get main queue               CALayer  border    CALayer layer           border name     bottomBorderLayer            self removePreviouslyAddedLayer border name           border backgroundColor   color CGColor          border frame   CGRectMake 0  self frame size height - borderWidth  self frame size width  borderWidth            self layer addSublayer border            self addObserver self forKeyPath    bounds  options NSKeyValueObservingOptionNew context bottomBorderContext              -  void addLeftBorderWithColor  UIColor   color andWidth  CGFloat  borderWidth       dispatch async dispatch get main queue               CALayer  border    CALayer layer           border name     leftBorderLayer            self removePreviouslyAddedLayer border name           border backgroundColor   color CGColor          border frame   CGRectMake 0  0  borderWidth  self frame size height            self layer addSublayer border            self addObserver self forKeyPath    bounds  options NSKeyValueObservingOptionNew context leftBorderContext              -  void addRightBorderWithColor  UIColor   color andWidth  CGFloat  borderWidth       dispatch async dispatch get main queue               CALayer  border    CALayer layer           border name     rightBorderLayer            self removePreviouslyAddedLayer border name           border backgroundColor   color CGColor          border frame   CGRectMake self frame size width - borderWidth  0  borderWidth  self frame size height            self layer addSublayer border            self addObserver self forKeyPath    bounds  options NSKeyValueObservingOptionNew context rightBorderContext             -  void observeValueForKeyPath  NSString   keyPath ofObject  id object change  NSDictionary   change context  void   context       if  context    topBorderContext            for  CALayer  border in self layer sublayers                if   border name isEqualToString   topBorderLayer                       border setFrame CGRectMake 0  0  self frame size width  border frame size height                                  else if  context    bottomBorderContext            for  CALayer  border in self layer sublayers                if   border name isEqualToString   bottomBorderLayer                       border setFrame CGRectMake 0  self frame size height - border frame size height  self frame size width  border frame size height                                  else if  context    leftBorderContext            for  CALayer  border in self layer sublayers                if   border name isEqualToString   leftBorderLayer                       border setFrame CGRectMake 0  0  border frame size width  self frame size height                                  else if  context    rightBorderContext            for  CALayer  border in self layer sublayers                if   border name isEqualToString   rightBorderLayer                       border setFrame CGRectMake self frame size width - border frame size width  0  border frame size width  self frame size height                                  else            super observeValueForKeyPath keyPath ofObject object change change context context           -  void removePreviouslyAddedLayer  NSString   name       if  self layer sublayers count  gt  0            for  CALayer  layer in self layer sublayers                if   layer name isEqualToString name                      layer removeFromSuperlayer                                     end   Usage  -      Select any control from storyboard  then show attribute inspector  Right side  You will see below image Example  Note   Border only appear at run time    Now You can set any side of border colour and width

User · Answer

The most complete answer  https   github com oney UIView-Border  let rectangle   UIView frame  CGRect x  100  y  100  width  100  height  60   rectangle backgroundColor   UIColor grayColor   view addSubview rectangle  rectangle borderTop   Border size  3  color  UIColor orangeColor    offset  UIEdgeInsets top  0  left  -10  bottom  0  right  -5   rectangle borderBottom   Border size  6  color  UIColor redColor    offset  UIEdgeInsets top  0  left  10  bottom  10  right  0   rectangle borderLeft   Border size  2  color  UIColor blueColor    offset  UIEdgeInsets top  10  left  -10  bottom  0  right  0   rectangle borderRight   Border size  2  color  UIColor greenColor    offset  UIEdgeInsets top  10  left  10  bottom  0  right  0

User · Answer

Swift 5 1  Use with two extension  method return CALayer  so you would reuse it to update frames   enum Border  Int       case top   0     case bottom     case right     case left    extension UIView       func addBorder for side  Border  withColor color  UIColor  borderWidth  CGFloat  - gt  CALayer          let borderLayer   CALayer          borderLayer backgroundColor   color cgColor         let xOrigin  CGFloat    side     right   frame width - borderWidth   0         let yOrigin  CGFloat    side     bottom   frame height - borderWidth   0          let width  CGFloat    side     right    side     left    borderWidth   frame width        let height  CGFloat    side     top    side     bottom    borderWidth   frame height         borderLayer frame   CGRect x  xOrigin  y  yOrigin  width  width  height  height         layer addSublayer borderLayer         return borderLayer          extension CALayer       func updateBorderLayer for side  Border  withViewFrame viewFrame  CGRect            let xOrigin  CGFloat    side     right   viewFrame width - frame width   0          let yOrigin  CGFloat    side     bottom   viewFrame height - frame height   0           let width  CGFloat    side     right    side     left    frame width   viewFrame width         let height  CGFloat    side     top    side     bottom    frame height   viewFrame height          frame   CGRect x  xOrigin  y  yOrigin  width  width  height  height

User · Answer

If you use constraints  and so don t have the frame sizes  then you can add a border view with the required constraints      MARK  - Add a border to one side of a view  public enum BorderSide       case top  bottom  left  right    extension UIView       public func addBorder side  BorderSide  color  UIColor  width  CGFloat            let border   UIView           border translatesAutoresizingMaskIntoConstraints   false         border backgroundColor   color         self addSubview border           let topConstraint   topAnchor constraint equalTo  border topAnchor          let rightConstraint   trailingAnchor constraint equalTo  border trailingAnchor          let bottomConstraint   bottomAnchor constraint equalTo  border bottomAnchor          let leftConstraint   leadingAnchor constraint equalTo  border leadingAnchor          let heightConstraint   border heightAnchor constraint equalToConstant  width          let widthConstraint   border widthAnchor constraint equalToConstant  width            switch side           case  top              NSLayoutConstraint activate  leftConstraint  topConstraint  rightConstraint  heightConstraint           case  right              NSLayoutConstraint activate  topConstraint  rightConstraint  bottomConstraint  widthConstraint           case  bottom              NSLayoutConstraint activate  rightConstraint  bottomConstraint  leftConstraint  heightConstraint           case  left              NSLayoutConstraint activate  bottomConstraint  leftConstraint  topConstraint  widthConstraint                       Then set it something like the below  myButton addBorder side   left  color  UIColor lightGray  width  1     inspired by this answer

User · Answer

Instead of using a UIView  as  ImreKel  nyi suggests  you can use a CALayer      Add a bottomBorder  CALayer  bottomBorder    CALayer layer    bottomBorder frame   CGRectMake 0 0f  43 0f  toScrollView frame size width  1 0f    bottomBorder backgroundColor    UIColor colorWithWhite 0 8f                                                   alpha 1 0f  CGColor    toScrollView layer addSublayer bottomBorder

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Swift 3 version of Confile s answer   import UIKit  extension UIView       func addTopBorderWithColor color  UIColor  width  CGFloat            let border   CALayer           border backgroundColor   color cgColor         border frame   CGRect x  0  y  0  width  self frame size width  height  width          self layer addSublayer border             func addRightBorderWithColor color  UIColor  width  CGFloat            let border   CALayer           border backgroundColor   color cgColor         border frame   CGRect x  self frame size width - width  y  0  width  width  height  self frame size height          self layer addSublayer border             func addBottomBorderWithColor color  UIColor  width  CGFloat            let border   CALayer           border backgroundColor   color cgColor         border frame   CGRect x  0  y  self frame size height - width  width  self frame size width  height  width          self layer addSublayer border             func addLeftBorderWithColor color  UIColor  width  CGFloat            let border   CALayer           border backgroundColor   color cgColor         border frame   CGRect x  0  y  0  width  width  height  self frame size height          self layer addSublayer border            Usage when using auto layout   class CustomView  UIView        override func awakeFromNib             super awakeFromNib              override func layoutSubviews             addBottomBorderWithColor color  UIColor white  width  1

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Or  the most performance-friendly way is to overload drawRect  simply like that    interface TPActionSheetButton   UIButton   property  assign  BOOL drawsTopLine   property  assign  BOOL drawsBottomLine   property  assign  BOOL drawsRightLine   property  assign  BOOL drawsLeftLine   property  strong  nonatomic  UIColor   lineColor    end   implementation TPActionSheetButton  -  void  drawRect  CGRect rect       CGContextRef ctx   UIGraphicsGetCurrentContext         CGContextSetLineWidth ctx  0 5f     UIScreen mainScreen  scale        CGFloat red  green  blue  alpha       self lineColor getRed  amp red green  amp green blue  amp blue alpha  amp alpha       CGContextSetRGBStrokeColor ctx  red  green  blue  alpha        if self drawsTopLine            CGContextBeginPath ctx           CGContextMoveToPoint ctx  CGRectGetMinX rect   CGRectGetMinY rect            CGContextAddLineToPoint ctx  CGRectGetMaxX rect   CGRectGetMinY rect            CGContextStrokePath ctx             if self drawsBottomLine            CGContextBeginPath ctx           CGContextMoveToPoint ctx  CGRectGetMinX rect   CGRectGetMaxY rect            CGContextAddLineToPoint ctx  CGRectGetMaxX rect   CGRectGetMaxY rect            CGContextStrokePath ctx             if self drawsLeftLine            CGContextBeginPath ctx           CGContextMoveToPoint ctx  CGRectGetMinX rect   CGRectGetMinY rect            CGContextAddLineToPoint ctx  CGRectGetMinX rect   CGRectGetMaxY rect            CGContextStrokePath ctx             if self drawsRightLine            CGContextBeginPath ctx           CGContextMoveToPoint ctx  CGRectGetMaxX rect   CGRectGetMinY rect            CGContextAddLineToPoint ctx  CGRectGetMaxX rect   CGRectGetMaxY rect            CGContextStrokePath ctx               super drawRect rect       end

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Solution for Swift 4  let bottomBorder   CALayer           bottomBorder frame   CGRect x  0 0  y  calendarView frame size height-1  width  calendarView frame width  height  1 0          bottomBorder backgroundColor    colorLiteral red  0 8039215803  green  0 8039215803  blue  0 8039215803  alpha  1          calendarView layer addSublayer bottomBorder    BackgroundColor lightGray  Change color if you need

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Swift 4  Based on  https   stackoverflow com a 32821607 9980800  UIView Border  extension UIView      enum ViewBorder  String         case left  right  top  bottom        func add Border border  ViewBorder  withColor color  UIColor   UIColor lightGray  andWidth width  CGFloat   1 0         let borderView   UIView       borderView backgroundColor   color     borderView translatesAutoresizingMaskIntoConstraints   false     self addSubview borderView      NSLayoutConstraint activate getConstrainsFor forView  borderView  WithBorderType  border  andWidth  width          private func getConstrainsFor forView borderView  UIView  WithBorderType border  ViewBorder  andWidth width  CGFloat  - gt   NSLayoutConstraint         let height   borderView heightAnchor constraint equalToConstant  width      let widthAnchor   borderView widthAnchor constraint equalToConstant  width      let leading   borderView leadingAnchor constraint equalTo  self leadingAnchor      let trailing   borderView trailingAnchor constraint equalTo  self trailingAnchor      let top   borderView topAnchor constraint equalTo  self topAnchor      let bottom   borderView bottomAnchor constraint equalTo  self bottomAnchor       switch border        case  bottom          return  bottom  leading  trailing  height       case  top          return  top  leading  trailing  height       case  left          return  top  bottom  leading  widthAnchor       case  right          return  top  bottom  trailing  widthAnchor               Usage -  class ViewController  UIViewController     IBOutlet weak var sampleView  UIView  override func viewDidLoad         super viewDidLoad          Do any additional setup after loading the view  typically from a nib      sampleView add Border   bottom     override func didReceiveMemoryWarning         super didReceiveMemoryWarning          Dispose of any resources that can be recreated

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Swift 4 Based on https   stackoverflow com a 32513578 5391914 import UIKit enum ViewBorder  String       case Left    quot borderLeft quot      case Right    quot borderRight quot      case Top    quot borderTop quot      case Bottom    quot borderBottom quot     extension UIView            func addBorder vBorders   ViewBorder   color  UIColor  width  CGFloat            vBorders forEach   vBorder in             let border   CALayer               border backgroundColor   color cgColor             border name   vBorder rawValue             switch vBorder               case  Left                  border frame   CGRect x  0  y  0  width  width  height  self frame size height              case  Right                  border frame   CGRect x self frame size width - width  y  0  width  width  height  self frame size height              case  Top                  border frame   CGRect x  0  y  0  width  self frame size width  height  width              case  Bottom                  border frame   CGRect x  0  y  self frame size height - width   width  self frame size width  height  width                            self layer addSublayer border

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Implemented in a category as below   UIButton Border h    interface UIButton  Border   -  void addBottomBorderWithColor   UIColor    color andWidth  CGFloat  borderWidth   -  void addLeftBorderWithColor   UIColor    color andWidth  CGFloat  borderWidth   -  void addRightBorderWithColor   UIColor    color andWidth  CGFloat  borderWidth   -  void addTopBorderWithColor   UIColor    color andWidth  CGFloat  borderWidth    end   UIButton Border m    implementation UIButton  Border   -  void addTopBorderWithColor  UIColor   color andWidth  CGFloat  borderWidth       CALayer  border    CALayer layer       border backgroundColor   color CGColor       border frame   CGRectMake 0  0  self frame size width  borderWidth        self layer addSublayer border      -  void addBottomBorderWithColor  UIColor   color andWidth  CGFloat  borderWidth       CALayer  border    CALayer layer       border backgroundColor   color CGColor       border frame   CGRectMake 0  self frame size height - borderWidth  self frame size width  borderWidth        self layer addSublayer border      -  void addLeftBorderWithColor  UIColor   color andWidth  CGFloat  borderWidth       CALayer  border    CALayer layer       border backgroundColor   color CGColor       border frame   CGRectMake 0  0  borderWidth  self frame size height        self layer addSublayer border      -  void addRightBorderWithColor  UIColor   color andWidth  CGFloat  borderWidth       CALayer  border    CALayer layer       border backgroundColor   color CGColor       border frame   CGRectMake self frame size width - borderWidth  0  borderWidth  self frame size height        self layer addSublayer border       end

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You don t have to add a layer for each border  just use a bezier path to draw them once   CGRect rect   self bounds   CGPoint destPoint 4     CGPointZero       CGPoint  0  rect size height        CGPoint  rect size width  rect size height        CGPoint  rect size width  0     BOOL position 4      top   left   bottom   right    UIBezierPath  path    UIBezierPath new    path moveToPoint destPoint 3     for  int i   0  i  lt  4    i        if  position i              path addLineToPoint destPoint i          else            path moveToPoint destPoint i             CAShapeLayer  borderLayer    CAShapeLayer new   borderLayer frame   self bounds  borderLayer path    path CGPath  borderLayer lineWidth      borderWidth    1    UIScreen mainScreen  scale  borderLayer strokeColor    borderColor CGColor  borderLayer fillColor      UIColor clearColor  CGColor    self layer addSublayer borderLayer

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Swift 4  If you need a really adaptive solution  for all screen sizes   then this is it         Extends UIView with shortcut methods      author Alexander Volkov    version 1 0    extension UIView            Adds bottom border to the view with given side margins                 - Parameters            - color  the border color           - margins  the left and right margin           - borderLineSize  the size of the border     func addBottomBorder color  UIColor   UIColor red  margins  CGFloat   0  borderLineSize  CGFloat   1            let border   UIView           border backgroundColor   color         border translatesAutoresizingMaskIntoConstraints   false         self addSubview border          border addConstraint NSLayoutConstraint item  border                                                  attribute   height                                                  relatedBy   equal                                                  toItem  nil                                                  attribute   height                                                  multiplier  1  constant  borderLineSize           self addConstraint NSLayoutConstraint item  border                                                attribute   bottom                                                relatedBy   equal                                                toItem  self                                                attribute   bottom                                                multiplier  1  constant  0           self addConstraint NSLayoutConstraint item  border                                                attribute   leading                                                relatedBy   equal                                                toItem  self                                                attribute   leading                                                multiplier  1  constant  margins           self addConstraint NSLayoutConstraint item  border                                                attribute   trailing                                                relatedBy   equal                                                toItem  self                                                attribute   trailing                                                multiplier  1  constant  margins

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You can add a separate UIView with 1 point height and gray background color to self view and position it right below toScrollView      EDIT  Unless you have a good reason  want to use some services of UIView which are not offered by CALayer   you should use CALayer as  MattDiPasquale suggests  UIView has a greater overhead  which might not be a problem in most cases  but still  the other solution is more elegant

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The problem with these extension methods is that when the UIView UIButton later adjusts it s size  you have no chance to change the CALayer s size to match the new size  Which will leave you with a misplaced border  I found it was better to subclass my UIButton  you could of course subclass other UIViews as well   Here is some code   enum BorderedButtonSide       case Top  Right  Bottom  Left     class BorderedButton   UIButton        private var borderTop  CALayer      private var borderTopWidth  CGFloat      private var borderRight  CALayer      private var borderRightWidth  CGFloat      private var borderBottom  CALayer      private var borderBottomWidth  CGFloat      private var borderLeft  CALayer      private var borderLeftWidth  CGFloat        func setBorder side  BorderedButtonSide    color  UIColor    width  CGFloat             let border   CALayer           border backgroundColor   color CGColor          switch side           case  Top              border frame   CGRect x  0  y  0  width  frame size width  height  width              borderTop  removeFromSuperlayer               borderTop   border             borderTopWidth   width         case  Right              border frame   CGRect x  frame size width - width  y  0  width  width  height  frame size height              borderRight  removeFromSuperlayer               borderRight   border             borderRightWidth   width         case  Bottom              border frame   CGRect x  0  y  frame size height - width  width  frame size width  height  width              borderBottom  removeFromSuperlayer               borderBottom   border             borderBottomWidth   width         case  Left              border frame   CGRect x  0  y  0  width  width  height  frame size height              borderLeft  removeFromSuperlayer               borderLeft   border             borderLeftWidth   width                    layer addSublayer border             override func layoutSubviews             super layoutSubviews           borderTop  frame   CGRect x  0  y  0  width  frame size width  height  borderTopWidth           borderRight  frame   CGRect x  frame size width - borderRightWidth   y  0  width  borderRightWidth   height  frame size height          borderBottom  frame   CGRect x  0  y  frame size height - borderBottomWidth   width  frame size width  height  borderBottomWidth           borderLeft  frame   CGRect x  0  y  0  width  borderLeftWidth   height  frame size height

[ios] UIView bottom border?

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