我正在子类化 UINavigationController 并覆盖 supportedInterfaceOrientations 方法。在该方法中，我委托(delegate)给 visibleViewController.supportedInterfaceOrientations。
但是，当我以模态方式呈现 UIImagePickerController 时，visibleViewController 为 nil .
iOS 10 中发生了一些变化，导致 visibleViewController 返回 nil。
如果我更改代码以使用 presentedViewController，它会正确返回 UIImagePickerController 。
这是正确的更改吗？为什么会发生这种变化？
最佳答案
听起来你可以使用 setOverrideTraitCollection(_:forChildViewController:) — —
(我想你可以用 UIImagePickerController 实现类似的东西):
func setOverrideTraitCollection(_ collection: UITraitCollection?,
forChildViewController childViewController: UIViewController)
Normally, traits are passed unmodified from the parent view controller to its child view controllers. When implementing a custom container view controller, you can use this method to change the traits of any embedded child view controllers to something more appropriate for your layout. Making such a change alters other view controller behaviors associated with that child. For example, modal presentations behave differently in a horizontally compact versus horizontally regular environment. You might also make such a change to force the same set of traits on the child view controller regardless of the actual trait environment.
↪︎ Video Presentation from WWDC 2016 : Making Apps Adaptive, Part 1 and 2
Apple 有 recommended使用较新的 API UITraitCollection 和 UITraitEnvironment在尝试适应 supportedInterfaceOrientations 前进...
关于ios - 如何在导航 Controller iOS 10 中正确覆盖 supportedInterfaceOrientations？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40002314/