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iosswiftcocoa-touchuiviewuiscrollview

How to detect when UIView size is changed in swift ios xcode?

I am trying some stuffs out with CATiledLayer inside UIScrollView.

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.

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

I tried 

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

inside UIView subclass,

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

Solution

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