edgesForExtendedLayout ignored on iOS9 when using

问题:

iOS9 seems to ignore destination view controller's edgesForExtendedLayout when implementing custom animation using UIViewControllerAnimatedTransitioning, therefore the content ends up below the navigation bar. Any idea why this is happening?

I've hosted an example at https://github.com/nmarkovic04/CustomAnimationTest. Running it on 8.4 and 9.1 shows the difference but you can most likely try any other 8.x and 9.x version.

Running on XCode 7, Swift 2.0.

回答1:

this in ViewDidLoad fixes it can you confirm pls :]

self.edgesForExtendedLayout = .Top self.extendedLayoutIncludesOpaqueBars = true

回答2:

You have to setup proper toViewController's frame. transitionContext.finalFrame(for:) will help you. This is my animateTransition(using:) function for fade in/out animation. That one line setting up frame will also fix your shared project.

func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {

        if let toViewController = transitionContext.viewController(forKey: .to) {

            transitionContext.containerView.addSubview(toViewController.view)
            toViewController.view.frame = transitionContext.finalFrame(for: toViewController)
            toViewController.view.alpha = 0.0

            UIView.animate(withDuration: 0.5,
                           animations: {
                            toViewController.view.alpha = 1.0},
                           completion: { finished in
                            transitionContext.completeTransition(!transitionContext.transitionWasCancelled)})
        }
    }

回答3:

Just setting this:

  self.edgesForExtendedLayout = UIRectEdgeTop;

Resolved the issue for me.

回答4:

I know this is awful, but in viewDidLoad() i solved with this:

var frame = self.view.frame
frame.origin.y = 64 //The height of status bar + navigation bar
self.view.frame = frame

For me the problem comes out the first time my view controller is seen, when i rotate the device the problem is gone.