如何检测swift ios xcode中何时更改UIView大小？ [英] How to detect when UIView size is changed in swift ios xcode?

问题描述

我正在使用UIScrollView中的CATiledLayer尝试一些东西。

I am trying some stuffs out with CATiledLayer inside UIScrollView.

不知何故，UIScrollView中UIView的大小变为大数。我需要找出导致此调整大小的确切原因。

Somehow, the size of UIView inside the UIScrollView gets changed to a large number. I need to find out exactly what is causing this resize.

有没有办法检测UIView的大小（帧，边界） ）或者UIScrollView的contentSize是否已调整大小？

Is there a way to detect when the size of UIView(either frame, bounds) or the contentSize of UIScrollView is resized?

我试过

override var frame: CGRect {
    didSet {
        println("frame changed");
    }
}

在UIView子类中，

inside UIView subclass,

但它仅在应用程序启动时调用一次，但之后会调整UIView的大小。

but it is only called once when the app starts, although the size of UIView is resized afterwards.

推荐答案

每当边界发生变化时，将调用

viewWillLayoutSubviews（）和 viewDidLayoutSubviews（）。在视图控制器中。

viewWillLayoutSubviews() and viewDidLayoutSubviews() will be called whenever the bounds change. In the view controller.

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