How do I use Safe Area Layout programmatically

Question

Since I don t use storyboards to create my views  I was wondering if there s the  Use Safe Area Guides  option programmatically or something like that    I ve tried to anchor my views to   view safeAreaLayoutGuide  but they keep overlapping the top notch in the iPhone X simulator

User · Answer

Use constraints with visual format and you get respect for the safe area for free.

class ViewController: UIViewController {

    var greenView = UIView()

    override func viewDidLoad() {
        super.viewDidLoad()
        greenView.backgroundColor = .green
        view.addSubview(greenView)
    }
    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()

        greenView.translatesAutoresizingMaskIntoConstraints = false
        let views : [String:Any] = ["greenView":greenView]
        view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-[greenView]-|", options: [], metrics: nil, views: views))
        view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-[greenView]-|", options: [], metrics: nil, views: views))
    }
}

User · Answer

Here is sample code  Ref from  Safe Area Layout Guide   If you create your constraints in code use the safeAreaLayoutGuide property of UIView to get the relevant layout anchors  Let   s recreate the above Interface Builder example in code to see how it looks   Assuming we have the green view as a property in our view controller   private let greenView   UIView     We might have a function to set up the views and constraints called from viewDidLoad   private func setupView       greenView translatesAutoresizingMaskIntoConstraints   false   greenView backgroundColor    green   view addSubview greenView      Create the leading and trailing margin constraints as always using the layoutMarginsGuide of the root view    let margins   view layoutMarginsGuide  NSLayoutConstraint activate       greenView leadingAnchor constraint equalTo  margins leadingAnchor       greenView trailingAnchor constraint equalTo  margins trailingAnchor        Now  unless you are targeting iOS 11 and later  you will need to wrap the safe area layout guide constraints with  available and fall back to top and bottom layout guides for earlier iOS versions   if  available iOS 11         let guide   view safeAreaLayoutGuide   NSLayoutConstraint activate      greenView topAnchor constraintEqualToSystemSpacingBelow guide topAnchor  multiplier  1 0      guide bottomAnchor constraintEqualToSystemSpacingBelow greenView bottomAnchor  multiplier  1 0          else      let standardSpacing  CGFloat   8 0    NSLayoutConstraint activate      greenView topAnchor constraint equalTo  topLayoutGuide bottomAnchor  constant  standardSpacing      bottomLayoutGuide topAnchor constraint equalTo  greenView bottomAnchor  constant  standardSpacing            Result        Here is Apple Developer Official Documentation for Safe Area Layout Guide  Safe Area is required to handle user interface design for iPhone-X  Here is basic guideline for How to design user interface for iPhone-X using Safe Area Layout

User · Answer

Use UIWindow or UIView s safeAreaInsets  bottom  top  left  right      available iOS 11 0        height - UIApplication shared keyWindow  safeAreaInsets bottom     On iPhoneX    UIApplication shared keyWindow  safeAreaInsets top    44    UIApplication shared keyWindow  safeAreaInsets bottom   34     Other devices    UIApplication shared keyWindow  safeAreaInsets top    0    UIApplication shared keyWindow  safeAreaInsets bottom   0     example let window   UIApplication shared keyWindow  let viewWidth   window frame size width let viewHeight   window frame size height - window safeAreaInsets bottom let viewFrame   CGRect x  0  y  0  width  viewWidth  height  viewHeight  let aView   UIView frame  viewFrame  aView backgroundColor    red view addSubview aView  aView autoresizingMask     flexibleWidth   flexibleHeight

User · Answer

I m actually using an extension for it and controlling if it is ios 11 or not   extension UIView      var safeTopAnchor  NSLayoutYAxisAnchor       if  available iOS 11 0             return self safeAreaLayoutGuide topAnchor           return self topAnchor        var safeLeftAnchor  NSLayoutXAxisAnchor       if  available iOS 11 0            return self safeAreaLayoutGuide leftAnchor           return self leftAnchor        var safeRightAnchor  NSLayoutXAxisAnchor       if  available iOS 11 0            return self safeAreaLayoutGuide rightAnchor           return self rightAnchor        var safeBottomAnchor  NSLayoutYAxisAnchor       if  available iOS 11 0             return self safeAreaLayoutGuide bottomAnchor           return self bottomAnchor

User · Answer

SafeAreaLayoutGuide is UIView property       The top of the safeAreaLayoutGuide indicates the unobscured top edge   of the view  e g  not behind        the status bar or navigation bar  if present   Similarly for the other edges    Use safeAreaLayoutGuide for avoid our objects clipping overlapping from rounded corners  navigation bars  tab bars  toolbars  and other ancestor views   We can create safeAreaLayoutGuide object  amp  set object constraints respectively   Constraints for Portrait   Landscape is -               self edgesForExtendedLayout       Optional our as per your view ladder          let newView   UIView           newView backgroundColor    red         self view addSubview newView          newView translatesAutoresizingMaskIntoConstraints   false         if  available iOS 11 0                   let guide   self view safeAreaLayoutGuide             newView trailingAnchor constraint equalTo  guide trailingAnchor  isActive   true             newView leadingAnchor constraint equalTo  guide leadingAnchor  isActive   true             newView topAnchor constraint equalTo  guide topAnchor  isActive   true             newView heightAnchor constraint equalToConstant  100  isActive   true                    else               NSLayoutConstraint item  newView  attribute   top  relatedBy   equal  toItem  view  attribute   top  multiplier  1 0  constant  0  isActive   true             NSLayoutConstraint item  newView  attribute   leading  relatedBy   equal  toItem  view  attribute   leading  multiplier  1 0  constant  0  isActive   true             NSLayoutConstraint item  newView  attribute   trailing  relatedBy   equal  toItem  view  attribute   trailing  multiplier  1 0  constant  0  isActive   true              newView heightAnchor constraint equalToConstant  100  isActive   true             UILayoutGuide  safeAreaLayoutGuide

User · Answer

I m using this instead of add leading and trailing margin constraints to the layoutMarginsGuide   UILayoutGuide  safe   self view safeAreaLayoutGuide  yourView translatesAutoresizingMaskIntoConstraints   NO   NSLayoutConstraint activateConstraints                                                safe trailingAnchor constraintEqualToAnchor yourView trailingAnchor                                               yourView leadingAnchor constraintEqualToAnchor safe leadingAnchor                                               yourView topAnchor constraintEqualToAnchor safe topAnchor                                               safe bottomAnchor constraintEqualToAnchor yourView bottomAnchor                                                  Please also check the option for lower version of ios 11 from Krunal s answer

User · Answer

This extension helps you to constraint a UIVIew to its superview and superview safeArea    extension UIView           Constraints a view to its superview     func constraintToSuperView             guard let superview   superview else   return           translatesAutoresizingMaskIntoConstraints   false          topAnchor constraint equalTo  superview topAnchor  isActive   true         leftAnchor constraint equalTo  superview leftAnchor  isActive   true         bottomAnchor constraint equalTo  superview bottomAnchor  isActive   true         rightAnchor constraint equalTo  superview rightAnchor  isActive   true               Constraints a view to its superview safe area     func constraintToSafeArea             guard let superview   superview else   return           translatesAutoresizingMaskIntoConstraints   false          topAnchor constraint equalTo  superview safeAreaLayoutGuide topAnchor  isActive   true         leftAnchor constraint equalTo  superview safeAreaLayoutGuide leftAnchor  isActive   true         bottomAnchor constraint equalTo  superview safeAreaLayoutGuide bottomAnchor  isActive   true         rightAnchor constraint equalTo  superview safeAreaLayoutGuide rightAnchor  isActive   true

User · Answer

You can use view safeAreaInsets as explained here https   www raywenderlich com 174078 auto-layout-visual-format-language-tutorial-2  code sample  taken from raywenderlich com    override func viewSafeAreaInsetsDidChange       super viewSafeAreaInsetsDidChange      if  allConstraints isEmpty       NSLayoutConstraint deactivate allConstraints      allConstraints removeAll          let newInsets   view safeAreaInsets   let leftMargin   newInsets left  gt  0   newInsets left   Metrics padding   let rightMargin   newInsets right  gt  0   newInsets right   Metrics padding   let topMargin   newInsets top  gt  0   newInsets top   Metrics padding   let bottomMargin   newInsets bottom  gt  0   newInsets bottom   Metrics padding    let metrics          horizontalPadding   Metrics padding       iconImageViewWidth   Metrics iconImageViewWidth       topMargin   topMargin       bottomMargin   bottomMargin       leftMargin   leftMargin       rightMargin   rightMargin      let views   String  Any         iconImageView   iconImageView     appNameLabel   appNameLabel     skipButton   skipButton     appImageView   appImageView     welcomeLabel   welcomeLabel     summaryLabel   summaryLabel     pageControl   pageControl   let iconVerticalConstraints   NSLayoutConstraint constraints    withVisualFormat   V  -topMargin- iconImageView 30       metrics  metrics    views  views  allConstraints    iconVerticalConstraints  let topRowHorizontalFormat         H  -leftMargin- iconImageView iconImageViewWidth  - appNameLabel - skipButton -rightMargin-

User · Answer

Safe area extension For Objective-C   implementation UIView  SafeArea   -  NSLayoutAnchor   safeTopAnchor       if   available iOS 11 0               return self safeAreaLayoutGuide topAnchor        else           return self topAnchor             -  NSLayoutAnchor   safeBottomAnchor       if   available iOS 11 0                return self safeAreaLayoutGuide bottomAnchor        else           return self bottomAnchor             end

User · Answer

Swift 4 2 and 5 0  Suppose you wan to add Leading  Trailing  Top and Bottom constraints on viewBg  So  you can use the below code   let guide   self view safeAreaLayoutGuide viewBg trailingAnchor constraint equalTo  guide trailingAnchor  isActive   true viewBg leadingAnchor constraint equalTo  guide leadingAnchor  isActive   true viewBg topAnchor constraint equalTo  guide topAnchor  isActive   true viewBg bottomAnchor constraint equalTo  guide bottomAnchor  isActive   true

User · Answer

For those of you who use SnapKit  just like me  the solution is anchoring your constraints to view safeAreaLayoutGuide like so   yourView snp makeConstraints    make  in     if  available iOS 11 0                 Bottom guide         make bottom equalTo view safeAreaLayoutGuide snp bottomMargin            Top guide         make top equalTo view safeAreaLayoutGuide snp topMargin            Leading guide         make leading equalTo view safeAreaLayoutGuide snp leadingMargin            Trailing guide         make trailing equalTo view safeAreaLayoutGuide snp trailingMargin          else           make edges equalToSuperview

[ios] How do I use Safe Area Layout programmatically?

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