UIView确实出现了吗? [英] UIView did appear?

问题描述

我想知道，当屏幕上显示了特定的UIView时，是否有办法获取委托?

I'm wondering, is there a way to get a delegate or something, when a particular UIView has been shown on the screen ?

推荐答案

快速版本.在您的UIView类中:

Swift version. Inside your UIView class just:

override func willMove(toWindow newWindow: UIWindow?) {
    super.willMove(toWindow: newWindow)

    if newWindow == nil {
        // UIView disappear
    } else {
        // UIView appear
    }
}

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