跳过快速的ViewController主要功能，例如viewDidDisappear

问题描述

在我的代码中，当视图消失时，将发生特定操作.我正在通过 viewDidDisappear()函数进行此操作.我有一个特定的按钮，按下该按钮会转到另一个视图.我想知道如何仅告诉特定按钮跳过 viewDidDisappear()所引起的功能.

我完全知道我可以在 viewDidDisappear()中添加一种'if'语句，但是我想知道是否有一种更有效的方法.

解决方案

viewDidDisappear()是 UIViewController 的生​​命周期回调方法，到目前为止，环境已调用该方法据我所知，没有办法禁用其调用.而且我不认为应该存在-正如我提到的那样，它是 UIViewController 生命周期的一部分，不调用它会破坏合同-请参阅其

因此，您必须(并且应该)使用 if 语句实现所需的目标.

执行以下操作:

  fileprivate var skipDisappearingAnimation = false覆盖func viewDidDisappear(_动画:布尔){super.viewDidDisappear(动画)prepareInterfaceForDisappearing()}fileprivate func prepareInterfaceForDisappearing(){警卫！skipDisappearingAnimation else {//每次重置skipDisappearingAnimation = false返回}//做您通常需要的东西}@objc fileprivate func buttonPressed(_发件人:UIButton){skipDisappearingAnimation = true//向前导航} 

In my code, when a view disappears, a specific action occurs. I am doing it through the viewDidDisappear() function.I have a specific button that when is pressed it goes to another view. I was wondering in what I way I could tell ONLY the function caused by a specific button to skip the viewDidDisappear().

I perfectly know I can add a sort of 'if' statement in the viewDidDisappear() but I was wondering if there was a more efficient method.

解决方案

viewDidDisappear() is a UIViewController's lifecycle callback method that's called by the environment - as far as I know there is no way to disable its calling. And I don't think there should be - as I mentioned, it is a part of UIViewController's lifecycle, not calling it would break the contract - see its documentation.

Therefore you have to (and you should) achieve what you want by using if statement.

Do something like this:

fileprivate var skipDisappearingAnimation = false

override func viewDidDisappear(_ animated: Bool) {
    super.viewDidDisappear(animated)

    prepareInterfaceForDisappearing()
}

fileprivate func prepareInterfaceForDisappearing() {
    guard !skipDisappearingAnimation else {
        // reset each time
        skipDisappearingAnimation = false
        return
    }

    // do the stuff you normally need
}

@objc fileprivate func buttonPressed(_ sender: UIButton) {
    skipDisappearingAnimation = true
    // navigate forward
}

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