Question

在使用我的应用程序时收到短信，我希望任何打开的键盘都被解雇。如何在app app delegate中的applicationWillResignActive中执行此操作？

Answer 1

像answer中的示例一样实现代码。让您的视图控制器注册UIApplicationWillResignActiveNotification。当通知触发时，请致电resignFirstResponder。这样就可以避免UIApplicationDelegate和视图控制器之间的紧密耦合。假设您的视图控制器有一个名为UITextField的{{1}}：

textField

Answer 2

对于Swift 5实现，请尝试

override func viewDidLoad() {
    super.viewDidLoad()
    let notificationCenter = NotificationCenter.default
    notificationCenter.addObserver(self, selector: #selector(appMovedToBackground), name: UIApplication.willResignActiveNotification, object: nil)
}

@objc func appMovedToBackground() {
    print("App moved to background!")
}

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applicationWillResignActive解除键盘iPhone

2 个答案: