How to get safeAreaInsets in viewWillTransitionToSize (iPhone X)

user_6452683 0
Viewed 2321

I’m trying to update the viewWillTransition(to size: with coordinator:) method for iPhoneX. But I can’t get the destinations of the safeAreaInsets values. Please help!

override func viewWillTransition(to size: CGSize,
        with coordinator: UIViewControllerTransitionCoordinator) {

    super.viewWillTransition(to: size, with: coordinator)

    if #available(iOS 11.0, *) {
        if let window = UIApplication.shared.keyWindow { 
            let insets = window.safeAreaInsets
            contentFrame = CGRect(x:insets.left, y:insets.top,
                width:size.width - insets.left - insets.right,
                height:size.height - insets.top - insets.bottom)
        }
    } else {
        contentFrame = CGRect(x:0,y:0,width:size.width, height:size.height)
    }
    self.updateViews()
}
iphone-x swift ios
2 Answers

I got the valid solution at Stackoverflow Japan.

It's just getting the insets in the UIViewControllerTransitionCoordinator.animate(alongsideTransition:completion:) closure like below:

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransition(to: size, with: coordinator)

    coordinator.animate(alongsideTransition: { (context) in
        ...

        let insets = ...safeAreaInsets

        ...
    }, completion: nil)
}
user_64526830

I also have this issue. After experimenting and I found a nice workaround without waiting for transition to finish.

  1. have a view (let's call it SizeListenerView) that anchor to the safe area, so that we only need to listen to this view's size change

In SizeListenerView

    override var bounds: CGRect {
        didSet {
            // now you can access the bounds here
        }
    }
user_23617520
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