ios - 切换应用程序时会调用 viewWillDisappear/viewDidDisappear 吗？

Question

我想知道 viewWillDisappear: 和 viewDidDisappear: 是否在 iOS 切换应用程序时被调用(例如，用户按下主页按钮)。这会导致 View 从屏幕上消失，但是是否为此调用了回调？

Answer 1

你可以。

我之前使用过的解决方案是在您的应用委托(delegate)中使用 applicationDidEnterBackground: 和 applicationWillEnterForeground:。

在您的应用委托(delegate)中执行此操作。

- (void)applicationDidEnterBackground:(UIApplication *)application {
    [self.window.rootViewController beginAppearanceTransition:NO animated:NO];
    [self.window.rootViewController endAppearanceTransition];
}

- (void)applicationWillEnterForeground:(UIApplication *)application {
    [self.window.rootViewController beginAppearanceTransition:YES animated:NO];
    [self.window.rootViewController endAppearanceTransition];
}

现在你的 viewWillDisappear:、viewDidDisappear:、viewWillAppear: 和 viewDidAppear: View Controller 层次结构的方法当您的应用程序进入后台并返回前台时将被调用。

希望这有用吗？

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编辑 24/11/16(Swift 3 版本)

func applicationDidEnterBackground(_ application: UIApplication) {
    window?.rootViewController?.beginAppearanceTransition(false, animated: false)
    window?.rootViewController?.endAppearanceTransition()
}
   
func applicationWillEnterForeground(_ application: UIApplication) {
    window?.rootViewController?.beginAppearanceTransition(true, animated: false)
    window?.rootViewController?.endAppearanceTransition()
}

---

编辑 2/1/2017(所有窗口)

func applicationDidEnterBackground(_ application: UIApplication) {
    for window in application.windows {
        window.rootViewController?.beginAppearanceTransition(false, animated: false)
        window.rootViewController?.endAppearanceTransition()
    }
}

func applicationWillEnterForeground(_ application: UIApplication) {
    for window in application.windows {
        window.rootViewController?.beginAppearanceTransition(true, animated: false)
        window.rootViewController?.endAppearanceTransition()
    }
}