How to Apply Gradient to background view of iOS Swift App

Question

I m trying to apply a gradient as the background color of a View  main view of a storyboard   The code runs  but nothing changes  I m using xCode Beta 2 and Swift   Here s the code   class Colors     let colorTop   UIColor red  192 0 255 0  green  38 0 255 0  blue  42 0 255 0  alpha  1 0    let colorBottom   UIColor red  35 0 255 0  green  2 0 255 0  blue  2 0 255 0  alpha  1 0     let gl  CAGradientLayer    init         gl   CAGradientLayer       gl colors     colorTop  colorBottom      gl locations     0 0  1 0          then in the view controller     let colors   Colors      func refresh             view backgroundColor   UIColor clearColor           var backgroundLayer   colors gl         backgroundLayer frame   view frame         view layer insertSublayer backgroundLayer  atIndex  0

User · Answer

Here s a variation for setting this up in a reusable Util class file  In your Xcode project    Create a new Swift class call it UI Util swift  and populate it as follows   import Foundation import UIKit  class UI Util        static func setGradientGreenBlue uiView  UIView             let colorTop    UIColor red  15 0 255 0  green  118 0 255 0  blue  128 0 255 0  alpha  1 0  cgColor         let colorBottom   UIColor red  84 0 255 0  green  187 0 255 0  blue  187 0 255 0  alpha  1 0  cgColor          let gradientLayer   CAGradientLayer           gradientLayer colors     colorTop  colorBottom          gradientLayer locations     0 0  1 0          gradientLayer frame   uiView bounds          uiView layer insertSublayer gradientLayer  at  0                Now you can call the function from any ViewController like so   class AbcViewController  UIViewController        override func viewDidLoad             super viewDidLoad                           UI Util setGradientGreen uiView  self view                           Thanks to katwal-Dipak s answer for the function code

User · Answer

It s easy           MARK  - Gradient extension CAGradientLayer       enum Point           case topLeft         case centerLeft         case bottomLeft         case topCenter         case center         case bottomCenter         case topRight         case centerRight         case bottomRight         var point  CGPoint               switch self               case  topLeft                  return CGPoint x  0  y  0              case  centerLeft                  return CGPoint x  0  y  0 5              case  bottomLeft                  return CGPoint x  0  y  1 0              case  topCenter                  return CGPoint x  0 5  y  0              case  center                  return CGPoint x  0 5  y  0 5              case  bottomCenter                  return CGPoint x  0 5  y  1 0              case  topRight                  return CGPoint x  1 0  y  0 0              case  centerRight                  return CGPoint x  1 0  y  0 5              case  bottomRight                  return CGPoint x  1 0  y  1 0                                    convenience init start  Point  end  Point  colors   CGColor   type  CAGradientLayerType            self init           self startPoint   start point         self endPoint   end point         self colors   colors         self locations    0   lt colors count  map NSNumber init          self type   type           Use like this -  let fistColor   UIColor white let lastColor   UIColor black let gradient   CAGradientLayer start   topLeft  end   topRight  colors   fistColor cgColor  lastColor cgColor   type   radial  gradient frame   yourView bounds yourView layer addSublayer gradient

User · Answer

I wanted to add a gradient to a view  and then anchor it using auto-layout       class GradientView  UIView        private let gradient  CAGradientLayer             let layer   CAGradientLayer           let topColor  UIColor   UIColor red 0 98  green 0 96  blue 0 93  alpha 0 5          let bottomColor  UIColor   UIColor white         layer colors    topColor cgColor  bottomColor cgColor          layer locations    0 1          return layer              init             super init frame   zero          gradient frame   frame         layer insertSublayer gradient  at  0             required init  coder aDecoder  NSCoder            fatalError  init coder   has not been implemented              override func layoutSubviews             super layoutSubviews           gradient frame   bounds

User · Answer

One thing I noticed is you can t add a gradient to a UILabel without clearing the text  One simple workaround is to use a UIButton and disable user interaction

User · Answer

This code will work with Swift 3 0  class GradientView  UIView        override open class var layerClass  AnyClass           get              return CAGradientLayer classForCoder                        required init  coder aDecoder  NSCoder            super init coder  aDecoder          let gradientLayer   self layer as  CAGradientLayer         let color1   UIColor white withAlphaComponent 0 1  cgColor as CGColor         let color2   UIColor white withAlphaComponent 0 9  cgColor as CGColor         gradientLayer locations    0 60  1 0          gradientLayer colors    color2  color1

User · Answer

The Colors you re providing to gradient must be of type CGColor  So set your array of CGColor to gl colors   The correct code is    class Colors       var gl CAGradientLayer       init             let colorTop   UIColor red  192 0   255 0  green  38 0   255 0  blue  42 0   255 0  alpha  1 0  cgColor         let colorBottom   UIColor red  35 0   255 0  green  2 0   255 0  blue  2 0   255 0  alpha  1 0  cgColor          self gl   CAGradientLayer           self gl colors    colorTop  colorBottom          self gl locations    0 0  1 0

User · Answer

Xcode 11     Swift 5 1    You can design your own Gradient View as follow    IBDesignable public class Gradient  UIView        IBInspectable var startColor    UIColor    black   didSet   updateColors           IBInspectable var endColor      UIColor    white   didSet   updateColors           IBInspectable var startLocation  Double     0 05   didSet   updateLocations           IBInspectable var endLocation    Double     0 95   didSet   updateLocations           IBInspectable var horizontalMode   Bool    false   didSet   updatePoints           IBInspectable var diagonalMode     Bool    false   didSet   updatePoints           override public class var layerClass  AnyClass   CAGradientLayer self        var gradientLayer  CAGradientLayer   layer as  CAGradientLayer        func updatePoints             if horizontalMode               gradientLayer startPoint   diagonalMode    init x  1  y  0     init x  0  y  0 5              gradientLayer endPoint     diagonalMode    init x  0  y  1     init x  1  y  0 5            else               gradientLayer startPoint   diagonalMode    init x  0  y  0     init x  0 5  y  0              gradientLayer endPoint     diagonalMode    init x  1  y  1     init x  0 5  y  1                      func updateLocations             gradientLayer locations    startLocation as NSNumber  endLocation as NSNumber            func updateColors             gradientLayer colors    startColor cgColor  endColor cgColor            override public func traitCollectionDidChange   previousTraitCollection  UITraitCollection             super traitCollectionDidChange previousTraitCollection          updatePoints           updateLocations           updateColors

User · Answer

To add gradient into layer  add   let layer   CAGradientLayer   layer frame   CGRect x  64  y  64  width  120  height  120  layer colors    UIColor red cgColor  UIColor blue cgColor  view layer addSublayer layer

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SwiftUI  You can use the LinearGradient struct as the first element in a ZStack  As the  bottom  of the ZStack  it will serve as the background color  AngularGradient and RadialGradient are also available   import SwiftUI  struct ContentView  View       var body  some View           ZStack               LinearGradient gradient  Gradient colors    red   blue    startPoint   top  endPoint   bottom                   edgesIgnoringSafeArea  all                 Put other content here  it will appear on top of the background gradient

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I made an UIView extension to apply a basic gradient to any view  extension UIView       func layerGradient             let layer   CAGradientLayer   CAGradientLayer           layer frame size   self frame size         layer frame origin   CGPointMake 0 0 0 0          layer cornerRadius   CGFloat frame width   20           let color0   UIColor red 250 0 255  green 250 0 255  blue 250 0 255  alpha 0 5  CGColor         let color1   UIColor red 200 0 255  green 200 0 255  blue  200 0 255  alpha 0 1  CGColor         let color2   UIColor red 150 0 255  green 150 0 255  blue  150 0 255  alpha 0 1  CGColor         let color3   UIColor red 100 0 255  green 100 0 255  blue  100 0 255  alpha 0 1  CGColor         let color4   UIColor red 50 0 255  green 50 0 255  blue 50 0 255  alpha 0 1  CGColor         let color5   UIColor red 0 0 255  green 0 0 255  blue 0 0 255  alpha 0 1  CGColor         let color6   UIColor red 150 0 255  green 150 0 255  blue 150 0 255  alpha 0 1  CGColor          layer colors    color0 color1 color2 color3 color4 color5 color6          self layer insertSublayer layer  atIndex  0

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Extend UIView with this custom class     GradientView swift  import UIKit  class GradientView  UIView           Default Colors     var colors  UIColor     UIColor redColor    UIColor blueColor         override func drawRect rect  CGRect                Must be set when the rect is drawn         setGradient colors 0   color2  colors 1              func setGradient color1  UIColor  color2  UIColor             let context   UIGraphicsGetCurrentContext           let gradient   CGGradientCreateWithColors CGColorSpaceCreateDeviceRGB     color1 CGColor  color2 CGColor    0  1                Draw Path         let path   UIBezierPath rect  CGRectMake 0  0  frame width  frame height           CGContextSaveGState context          path addClip           CGContextDrawLinearGradient context  gradient  CGPointMake frame width   2  0   CGPointMake frame width   2  frame height   CGGradientDrawingOptions            CGContextRestoreGState context             override func layoutSubviews                 Ensure view has a transparent background color  not required          backgroundColor   UIColor clearColor                Usage  gradientView colors    UIColor blackColor   colorWithAlphaComponent 0 8   UIColor clearColor       Result

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Xcode 11   Swift 5 If anybody is looking for a quick and easy way to add a gradient to a view  extension UIView            func addGradient colors   UIColor      blue   white   locations   NSNumber     0  2   startPoint  CGPoint   CGPoint x  0 0  y  1 0   endPoint  CGPoint   CGPoint x  1 0  y  1 0   type  CAGradientLayerType    axial                    let gradient   CAGradientLayer                    gradient frame size   self frame size         gradient frame origin   CGPoint x  0 0  y  0 0              Iterates through the colors array and casts the individual elements to cgColor            Alternatively  one could use a CGColor Array in the first place or do this cast in a for-loop         gradient colors   colors map   0 cgColor                    gradient locations   locations         gradient startPoint   startPoint         gradient endPoint   endPoint                     Insert the new layer at the bottom-most position            This way we won t cover any other elements         self layer insertSublayer gradient  at  0            Examples on how to use the extension     Testing view addGradient               Two Colors view addGradient colors    init rgb  0x75BBDB    black   locations   0  3               Full Blown view addGradient colors    init rgb  0x75BBDB    black   locations   0  3   startPoint  CGPoint x  0 0  y  1 5   endPoint  CGPoint x  1 0  y  2 0   type   axial    Optionally  use the following to input hex numbers  init rgb  0x75BBDB  extension UIColor      convenience init red  Int  green  Int  blue  Int           self init red  CGFloat red    255 0  green  CGFloat green    255 0  blue  CGFloat blue    255 0  alpha  1 0           convenience init rgb  Int           self init             red   rgb  gt  gt  16   amp  0xFF             green   rgb  gt  gt  8   amp  0xFF             blue  rgb  amp  0xFF

User · Answer

Try This   It s working for me     var gradientView   UIView frame  CGRect x  0  y  0  width  320  height  35     let gradientLayer CAGradientLayer   CAGradientLayer     gradientLayer frame size   self gradientView frame size   gradientLayer colors       UIColor white cgColor UIColor red withAlphaComponent 1  cgColor       Use diffrent colors   gradientView layer addSublayer gradientLayer      You can add starting and end point of gradient color       gradientLayer startPoint   CGPoint x  0 0  y  1 0      gradientLayer endPoint   CGPoint x  1 0  y  1 0      For more detail description refer Best Answer or you can follow CAGradientLayer From Apple  Hopes This is help for some one

User · Answer

if you want to use HEX instead of RGBA  just drag a new empty  swift and add below mentioned code        import UIKit      extension UIColor           convenience init rgba  String                var red    CGFloat   0 0             var green  CGFloat   0 0             var blue   CGFloat   0 0             var alpha  CGFloat   1 0              if rgba hasPrefix                        let index     advance rgba startIndex  1                  let hex       rgba substringFromIndex index                  let scanner   NSScanner string  hex                  var hexValue  CUnsignedLongLong   0                 if scanner scanHexLongLong  amp hexValue                        switch  count hex                         case 3                          red     CGFloat  hexValue  amp  0xF00   gt  gt  8          15 0                         green   CGFloat  hexValue  amp  0x0F0   gt  gt  4          15 0                         blue    CGFloat hexValue  amp  0x00F                 15 0                     case 4                          red     CGFloat  hexValue  amp  0xF000   gt  gt  12        15 0                         green   CGFloat  hexValue  amp  0x0F00   gt  gt  8         15 0                         blue    CGFloat  hexValue  amp  0x00F0   gt  gt  4         15 0                         alpha   CGFloat hexValue  amp  0x000F                15 0                     case 6                          red     CGFloat  hexValue  amp  0xFF0000   gt  gt  16      255 0                         green   CGFloat  hexValue  amp  0x00FF00   gt  gt  8       255 0                         blue    CGFloat hexValue  amp  0x0000FF              255 0                     case 8                          red     CGFloat  hexValue  amp  0xFF000000   gt  gt  24    255 0                         green   CGFloat  hexValue  amp  0x00FF0000   gt  gt  16    255 0                         blue    CGFloat  hexValue  amp  0x0000FF00   gt  gt  8     255 0                         alpha   CGFloat hexValue  amp  0x000000FF            255 0                     default                          print  Invalid RGB string  number of characters after     should be either 3  4  6 or 8                                           else                       println  Scan hex error                                   else                   print  Invalid RGB string  missing     as prefix                             self init red red  green green  blue blue  alpha alpha                similarly  drag another empty  swift file and add below mentioned code       class Colors       let colorTop   UIColor rgba     8968CD   CGColor     let colorBottom   UIColor rgba    5D478B   CGColor      let gl  CAGradientLayer      init             gl   CAGradientLayer           gl colors     colorTop  colorBottom          gl locations     0 0  1 0            after that in view controller  under class instantiate your  Color  class like this   let colors   Colors     add a new function    func refresh             view backgroundColor   UIColor clearColor           var backgroundLayer   colors gl         backgroundLayer frame   view frame         view layer insertSublayer backgroundLayer  atIndex  0          state that function in viewDidLoad   refresh     you re done     using HEX is way too easy if compared to RGBA   D

User · Answer

Just Specify the Frame of the View  where you want to show the gradient color   let firstColor    UIColor red  69 255  green  90 255  blue  195 255  alpha  1 0  CGColor   let secondColor   UIColor red  230 255  green  44 255  blue  75 255  alpha  1 0  CGColor      let gradientLayer   CAGradientLayer       gradientLayer colors     firstColor  secondColor      gradientLayer locations     0 0  1 0      gradientLayer frame   CGRectMake 0  0  375  64    You can mention frame here      self view layer addSublayer gradientLayer

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Swift 3 - Uses only textures and SKSpriteNode  doesn t require UIView  import Foundation import SpriteKit  class GradientSpriteNode   SKSpriteNode       convenience init size  CGSize  colors   UIColor   locations   CGFloat                 let texture   GradientSpriteNode texture size  size  colors  colors  locations  locations          self init texture  texture  color SKColor clear  size  texture size               private override init texture  SKTexture   color  SKColor  size  CGSize            super init texture  texture  color  color  size  size             required init  coder aDecoder  NSCoder            fatalError  init coder   has not been implemented              private static func texture size  CGSize  colors   UIColor   locations   CGFloat   - gt  SKTexture               UIGraphicsBeginImageContext size          let context   UIGraphicsGetCurrentContext            let gradient   CGGradient colorsSpace  CGColorSpaceCreateDeviceRGB    colors  colors map  0 cgColor  as CFArray  locations  locations           context drawLinearGradient gradient  start  CGPoint x  size width   2  y  0   end  CGPoint x  size width   2  y  size height   options  CGGradientDrawingOptions            let image   UIGraphicsGetImageFromCurrentImageContext           UIGraphicsEndImageContext           return SKTexture image  image              Usage   let gradient   GradientSpriteNode          size  CGSize width  100  height  100           colors   UIColor red  UIColor blue           locations   0 0  1 0   addChild gradient

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Swift 4  Add a view outlet   IBOutlet weak var gradientView  UIView   Add gradient to the view  func setGradient         let gradient  CAGradientLayer   CAGradientLayer       gradient colors    UIColor red cgColor  UIColor blue cgColor      gradient locations    0 0   1 0      gradient startPoint   CGPoint x  0 0  y  1 0      gradient endPoint   CGPoint x  1 0  y  1 0      gradient frame   gradientView layer frame     gradientView layer insertSublayer gradient  at  0

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For those wanting an Objective C version of the answer  Tested and works on iOS13     Done here so that constraints have completed and the frame is correct  -  void  viewDidLayoutSubviews         super viewDidLayoutSubviews       UIColor  colorTop    UIColor colorWithRed  CGFloat 192 0 255 0 green  38 0 255 0 blue  42 0 255 0 alpha 1 0       UIColor  colorBottom    UIColor colorWithRed  35 0 255 0 green  2 0 255 0 blue  2 0 255 0 alpha  1 0       CAGradientLayer  gl    CAGradientLayer new        gl setColors    id  colorTop CGColor    id  colorBottom CGColor          gl setLocations    0 0f   1 0f        self view backgroundColor    UIColor clearColor       CALayer  backgroundLayer   gl      backgroundLayer frame   self view frame       self view layer insertSublayer backgroundLayer atIndex 0

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Easy to use extension on swift 3  extension CALayer       func addGradienBorder colors  UIColor     UIColor red UIColor blue   width CGFloat   1            let gradientLayer   CAGradientLayer           gradientLayer frame    CGRect origin   zero  size  self bounds size          gradientLayer startPoint   CGPoint x 0 0  y 0 5          gradientLayer endPoint   CGPoint x 1 0  y 0 5          gradientLayer colors   colors map   0 cgColor            let shapeLayer   CAShapeLayer           shapeLayer lineWidth   width         shapeLayer path   UIBezierPath rect  self bounds  cgPath         shapeLayer fillColor   nil         shapeLayer strokeColor   UIColor black cgColor         gradientLayer mask   shapeLayer          self addSublayer gradientLayer            use to your view  example  yourView addGradienBorder color  UIColor black  opacity  0 1  offset  CGSize width 2   height  5   radius  3  viewCornerRadius  3 0

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I mixed the Rohit Sisodia and MGM answers     MARK  - Gradient  public enum CAGradientPoint       case topLeft     case centerLeft     case bottomLeft     case topCenter     case center     case bottomCenter     case topRight     case centerRight     case bottomRight     var point  CGPoint           switch self           case  topLeft              return CGPoint x  0  y  0          case  centerLeft              return CGPoint x  0  y  0 5          case  bottomLeft              return CGPoint x  0  y  1 0          case  topCenter              return CGPoint x  0 5  y  0          case  center              return CGPoint x  0 5  y  0 5          case  bottomCenter              return CGPoint x  0 5  y  1 0          case  topRight              return CGPoint x  1 0  y  0 0          case  centerRight              return CGPoint x  1 0  y  0 5          case  bottomRight              return CGPoint x  1 0  y  1 0                     extension CAGradientLayer        convenience init start  CAGradientPoint  end  CAGradientPoint  colors   CGColor   type  CAGradientLayerType            self init           self frame origin   CGPoint zero         self startPoint   start point         self endPoint   end point         self colors   colors         self locations    0   lt colors count  map NSNumber init          self type   type          extension UIView        func layerGradient startPoint CAGradientPoint  endPoint CAGradientPoint  colorArray  CGColor   type CAGradientLayerType             let gradient   CAGradientLayer start   topLeft  end   topRight  colors  colorArray  type  type          gradient frame size   self frame size         self layer insertSublayer gradient  at  0            To Use write -          btnUrdu layer cornerRadius   25         btnUrdu layer masksToBounds   true          btnUrdu layerGradient startPoint   centerRight  endPoint   centerLeft  colorArray   UIColor appBlue cgColor  UIColor appLightBlue cgColor   type   axial    Output

User · Answer

I have these extensions    IBDesignable class GradientView  UIView        IBInspectable var firstColor  UIColor   UIColor red      IBInspectable var secondColor  UIColor   UIColor green       IBInspectable var vertical  Bool   true      lazy var gradientLayer  CAGradientLayer             let layer   CAGradientLayer           layer colors    firstColor cgColor  secondColor cgColor          layer startPoint   CGPoint zero         return layer                MARK  -      required init  coder aDecoder  NSCoder            super init coder  aDecoder           applyGradient              override init frame  CGRect            super init frame  frame           applyGradient              override func prepareForInterfaceBuilder             super prepareForInterfaceBuilder           applyGradient              override func layoutSubviews             super layoutSubviews           updateGradientFrame                MARK  -      func applyGradient             updateGradientDirection           layer sublayers    gradientLayer             func updateGradientFrame             gradientLayer frame   bounds            func updateGradientDirection             gradientLayer endPoint   vertical   CGPoint x  0  y  1    CGPoint x  1  y  0            IBDesignable class ThreeColorsGradientView  UIView        IBInspectable var firstColor  UIColor   UIColor red      IBInspectable var secondColor  UIColor   UIColor green      IBInspectable var thirdColor  UIColor   UIColor blue       IBInspectable var vertical  Bool   true           didSet               updateGradientDirection                        lazy var gradientLayer  CAGradientLayer             let layer   CAGradientLayer           layer colors    firstColor cgColor  secondColor cgColor  thirdColor cgColor          layer startPoint   CGPoint zero         return layer                MARK  -      required init  coder aDecoder  NSCoder            super init coder  aDecoder           applyGradient              override init frame  CGRect            super init frame  frame           applyGradient              override func prepareForInterfaceBuilder             super prepareForInterfaceBuilder           applyGradient              override func layoutSubviews             super layoutSubviews           updateGradientFrame                MARK  -      func applyGradient             updateGradientDirection           layer sublayers    gradientLayer             func updateGradientFrame             gradientLayer frame   bounds            func updateGradientDirection             gradientLayer endPoint   vertical   CGPoint x  0  y  1    CGPoint x  1  y  0            IBDesignable class RadialGradientView  UIView         IBInspectable var outsideColor  UIColor   UIColor red      IBInspectable var insideColor  UIColor   UIColor green      override func awakeFromNib             super awakeFromNib            applyGradient              func applyGradient             let colors    insideColor cgColor  outsideColor cgColor  as CFArray         let endRadius   sqrt pow frame width 2  2    pow frame height 2  2           let center   CGPoint x  bounds size width   2  y  bounds size height   2          let gradient   CGGradient colorsSpace  nil  colors  colors  locations  nil          let context   UIGraphicsGetCurrentContext            context  drawRadialGradient gradient   startCenter  center  startRadius  0 0  endCenter  center  endRadius  endRadius  options  CGGradientDrawingOptions drawsBeforeStartLocation             override func draw   rect  CGRect            super draw rect            if TARGET INTERFACE BUILDER             applyGradient            endif           Usage

User · Answer

Use below code     extension UIView   func applyGradient colours   UIColor   - gt  Void    let gradient  CAGradientLayer   CAGradientLayer    gradient frame   self bounds  gradient colors   colours map    0 cgColor    gradient startPoint   CGPoint x   0 0  y   0 5   gradient endPoint   CGPoint x  1 0  y  0 5   self layer insertSublayer gradient  at  0         call this function like       self mainView applyGradient colours    green   blue

User · Answer

There is a library called Chameleon  https   github com viccalexander Chameleon  which one can use for gradient colors  It even has styles of gradient to implement   This is how you can add it in swift 4 podfile  pod  ChameleonFramework Swift    git     https   github com ViccAlexander Chameleon git    branch     wip swift4   import ChameleonFramework  let colors  UIColor        UIColor flatPurpleColorDark       UIColor flatWhiteColor     view backgroundColor   GradientColor  TopToBottom  frame  view frame  colors  colors

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For swift to apply CAGradientLayer to any object  Horizontal and vertical   func makeGradientColor  for  object   AnyObject   startPoint   CGPoint   endPoint   CGPoint  - gt  CAGradientLayer       let gradient  CAGradientLayer   CAGradientLayer        gradient colors     UIColor red  59 0 255 0  green  187 0 255 0  blue  182 0 255 0  alpha  1 00  cgColor    UIColor red  57 0 255 0  green  174 0 255 0  blue  236 0 255 0  alpha  1 00  cgColor       gradient locations    0 0   1 0       gradient startPoint   startPoint     gradient endPoint   endPoint     gradient frame   CGRect x  0 0  y  0 0  width  object frame size width  height  object frame size height      return gradient     How to use  let start   CGPoint   CGPoint x  0 0  y  1 0  let end   CGPoint   CGPoint x  1 0  y  1 0  let gradient  CAGradientLayer   self makeGradientColor for  vwTop  startPoint  start  endPoint  end  vwTop layer insertSublayer gradient  at  0   let start1   CGPoint   CGPoint x  1 0  y  1 0  let end1   CGPoint   CGPoint x  1 0  y  0 0  let gradient1  CAGradientLayer   self makeGradientColor for  vwTop  startPoint  start1  endPoint  end1  vwBottom layer insertSublayer gradient1  at  0    You can check output here

User · Answer

In Swift3 try this    func addGradient         let gradient CAGradientLayer   CAGradientLayer       gradient frame size   self viewThatHoldsGradient frame size     gradient colors    UIColor white cgColor UIColor white withAlphaComponent 0  cgColor    Or any colors     self viewThatHoldsGradient layer addSublayer gradient

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Here s a swift extension where you can pass any amount of arbitrary colors  It will remove any previous gradients before inserting one and it will return the newly inserted gradient layer for further manipulation if needed       extension UIView                 Given an Array of CGColor  it will          - Remove all sublayers of type CAGradientLayer          - Create and insert a new CAGradientLayer        - Parameters           - colors  An Array of CGColor with the colors for the gradient fill       - Returns  The newly created gradient CAGradientLayer             func layerGradient colors c  CGColor  - gt CAGradientLayer           self layer sublayers   self layer sublayers  filter      0 is CAGradientLayer           let layer   CAGradientLayer   CAGradientLayer           layer frame size   self frame size         layer frame origin   CGPointZero         layer colors   c         self layer insertSublayer layer  atIndex  0          return layer

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Cleaner code that lets you pass any UIColor to an instance of the GradientLayer class   class GradientLayer        let gradientLayer  CAGradientLayer     let colorTop  CGColor     let colorBottom  CGColor      init colorTop  UIColor  colorBottom  UIColor            self colorTop   colorTop CGColor         self colorBottom   colorBottom CGColor         gradientLayer   CAGradientLayer           gradientLayer colors    colorTop  colorBottom          gradientLayer locations    0 0  1 0

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And if you need to change the direction of the gradient you have to use startPoint and endPoint   let gradient  CAGradientLayer   CAGradientLayer    gradient colors    UIColor blue cgColor  UIColor red cgColor  gradient locations    0 0   1 0  gradient startPoint   CGPoint x  0 0  y  1 0  gradient endPoint   CGPoint x  1 0  y  1 0  gradient frame   CGRect x  0 0  y  0 0  width  self view frame size width  height  self view frame size height   self view layer insertSublayer gradient  at  0

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If you have view Collection  Multiple View  do this     func setGradientBackground         let v UIView     for v in viewgradian       here viewgradian is your view Collection Outlet name               let layer CALayer         var arr    AnyObject            for layer in v layer sublayers                       arr append layer                     let colorTop   UIColor red  216 0 255 0  green  240 0 255 0  blue  244 0 255 0  alpha  1 0  cgColor         let colorBottom   UIColor red  255 0 255 0  green  255 0 255 0  blue  255 0 255 0  alpha  1 0  cgColor         let gradientLayer   CAGradientLayer           gradientLayer colors     colorBottom  colorTop          gradientLayer startPoint   CGPoint x  1 0  y  0 0          gradientLayer endPoint   CGPoint x  0 0  y  1 0          gradientLayer frame   v bounds         v layer insertSublayer gradientLayer  at  0

User · Answer

Just modifying the above mentioned answer   func setGradientBackground         let colorTop    UIColor red  255 0 255 0  green  149 0 255 0  blue  0 0 255 0  alpha  1 0  cgColor     let colorBottom   UIColor red  255 0 255 0  green  94 0 255 0  blue  58 0 255 0  alpha  1 0  cgColor                      let gradientLayer   CAGradientLayer       gradientLayer colors    colorTop  colorBottom      gradientLayer locations    0 0  1 0      gradientLayer frame   self view bounds                  self view layer insertSublayer gradientLayer  at 0     Then call this method within viewWillAppear override func viewWillAppear   animated  Bool        setGradientBackground       super viewWillAppear animated

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