Question 67088 in IOS Swift Question posted in
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Correct way to get the screen size on iOS, after UIScreen.main deprecation – Ios swift

I always used UIScreen.main.bounds.size to get the screen size on iOS and worked fine.

Now (in iOS 16, I believe) when I try to access the screen size with the "main" instance of UIScreen a warning is displayed:

"main’ will be deprecated in a future version of iOS: Use a UIScreen instance
found through context instead: i.e, view.window.windowScene.screen

So my question is:
What is the correct way to get the screen size? for simplicity let’s imagine we are on the iPhone with, consequently, only one screen available. Thank you

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2

Answers


  1. 0

    From a ViewController:

    let screenSize = self.view.window?.windowScene?.screen.bounds.size
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  2. 0

    Per Apple discussion on UIScreen.main deprecation:

    Apple discourages the use of this symbol. Use a UIScreen instance
    found through context instead. For example, reference the screen that
    displays a view through the screen property on the window scene
    managing the window containing the view.

    Here is an extension to find the UIScreen instance through context:

    extension UIViewController {
  func screen() -> UIScreen? {
    var parent = self.parent
    var lastParent = parent
    
    while parent != nil {
      lastParent = parent
      parent = parent!.parent
    }
    
    return lastParent?.view.window?.windowScene?.screen
  }
}

    For reference, this is the same UIScreen instance associated with the windowScene in the SceneDelegate:

      func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

    guard let windowScene = (scene as? UIWindowScene) else { return }
    
    window = UIWindow(frame: windowScene.coordinateSpace.bounds)
    window?.windowScene = windowScene
    window?.rootViewController = ViewController()
    window?.makeKeyAndVisible()
    
    let screen = windowScene.screen
    
    configureNavigationBar()
  }
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