iOS 11 Layout guidance about safe Area for iPhone x

Question

My application already in app store, yesterday i have updated my Xcode version to 9 and works fine except iPhone x. UI got collapsed.

1.Here I have Created Two UIView(both are fixed height) named as Header and Tab bar and I have hidden my NavigationBar entire app.

2.Added extension to UIViewController for making Header and Tab bar

func addHeaderTab(currentViewController:UIViewController,content:String, isMenu:Bool){
        let noView = TopHeaderView()
        noView.tag = 12345
        noView.isMenu = isMenu
        noView.translatesAutoresizingMaskIntoConstraints = false
        currentViewController.view .addSubview(noView)
        if isMenu{
            noView.menuBtn .setImage(UIImage(named: "Small"), for: .normal)
            noView.logoImg.isHidden = false

        }else{
            noView.menuBtn .setImage(UIImage(named: "arrow_small"), for: .normal)
            noView.logoImg.isHidden = true
        }
        noView.titleLbl.text = content
        noView.delegate = (currentViewController as! menuOpen)

        NSLayoutConstraint(item: noView, attribute: .leading, relatedBy: .equal, toItem: currentViewController.view, attribute: .leading, multiplier: 1.0, constant: 0.0).isActive = true

        NSLayoutConstraint(item: noView, attribute: .trailing, relatedBy: .equal, toItem: currentViewController.view, attribute: .trailing, multiplier: 1.0, constant: 0.0).isActive = true

        NSLayoutConstraint(item: noView, attribute: .top, relatedBy: .equal, toItem: currentViewController.view, attribute: .top, multiplier: 1.0, constant: 0.0).isActive = true

        NSLayoutConstraint(item: noView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .height, multiplier: 1.0, constant: 64).isActive = true

    }

and calling this every Viewcontroller like below :

self.addHeaderTab(currentViewController: self, content:"நிகழ்ச்சி நிரல்" , isMenu: true)

Like that Tab bar also i have done but all the device working expect iPhone x.

See My screen shot :

i have studied about https://developer.apple.com/ios/human-interface-guidelines/overview/iphone-x/

but am not clear with their document.

Help would be appreciated, Thanks in advance.

Answer 1

With iOS11 (and the appearance of iPhoneX) Apple introduced the Safe Area Layout Guide to adapt your views to the iPhoneX.

The Safe Area is the area of the screen that is not overlapped by the notch or the home indicator.

To avoid the issue you are experiencing you have to change your noView's top constraint for iOS11:

if #available(iOS 11, *) {
   let guide = view.safeAreaLayoutGuide
   NSLayoutConstraint.activate([
      noView.topAnchor.constraint(equalTo: guide.topAnchor)
   ])
} else {
   NSLayoutConstraint.activate([
      noView.topAnchor.constraint(equalTo: currentViewController.topLayoutGuide.bottomAnchor)
   ])
}
NSLayoutConstraint.activate([
   noView.leadingAnchor.constraint(equalTo: currentViewController.view.leadingAnchor),
   noView.trailingAnchor.constraint(equalTo: currentViewController.view.trailingAnchor),
   noView.heightAnchor.constraint(equalToConstant: 65)
])

Unfortunately that is not all. Because now your noView moves down on iPhone X, but the status bar does not have a red background anymore. You have add a red background color behind the status bar:

You could make things a lot easier by using a UINavigationController (with a red navigation bar):

With this approach you don't have to set any constraints! The systems does all the adjustments for you automatically.

Answer 2

In Objective-C for top and bottom margin when on iPhone-X

if (@available(iOS 11, *)) {

    NSLayoutConstraint *bottomConstraint   = [NSLayoutConstraint constraintWithItem:self.childView
                                                                          attribute:NSLayoutAttributeBottom
                                                                          relatedBy:NSLayoutRelationEqual
                                                                             toItem:self.parentView.safeAreaLayoutGuide
                                                                          attribute:NSLayoutAttributeBottom
                                                                         multiplier:1.0
                                                                           constant:0];


    NSLayoutConstraint *topConstraint   = [NSLayoutConstraint constraintWithItem:self.childView
                                                                   attribute:NSLayoutAttributeTop
                                                                   relatedBy:NSLayoutRelationEqual
                                                                      toItem:self.parentView.safeAreaLayoutGuide
                                                                   attribute:NSLayoutAttributeTop
                                                                  multiplier:1.0
                                                                    constant:0];


} else {

    NSLayoutConstraint *bottomConstraint   = [NSLayoutConstraint constraintWithItem:self.childView
                                                                      attribute:NSLayoutAttributeBottom
                                                                      relatedBy:NSLayoutRelationEqual
                                                                         toItem:self.parentView
                                                                      attribute:NSLayoutAttributeBottom
                                                                     multiplier:1.0
                                                                       constant:0];


    NSLayoutConstraint *topConstraint   = [NSLayoutConstraint constraintWithItem:self.childView
                                                                   attribute:NSLayoutAttributeTop
                                                                   relatedBy:NSLayoutRelationEqual
                                                                      toItem:self.parentView
                                                                   attribute:NSLayoutAttributeTop
                                                                  multiplier:1.0
                                                                    constant:0];

}