ios - UIKit 错误？ viewWillAppear 在应该调用时未调用

Question

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Answer 1

似乎是一个 iOS 错误。不确定它是否对您的真实应用程序有帮助，但在您的 VC2 演示文稿中从 Current Context 更改为 Over Current Context 实际上有效并且在我看来视觉上看起来是一样的.

文档似乎表明 Over Current Context 是 UIModalPresentationFullScreen 的替代方法，但它显然也在使用当前上下文，所以我认为真正的区别在于您的情况只会是在 VC2 出现后 VC1 没有被移除。

When presenting a view controller using the UIModalPresentationFullScreen style, UIKit normally removes the views of the underlying view controller after the transition animations finish. You can prevent the removal of those views by specifying the UIModalPresentationOverCurrentContext style instead. You might use that style when the presented view controller has transparent areas that let underlying content show through.

Docs on View Controller Programming