该应用程序有一个动画,当应用程序进入后台或前台时停止,并在应用程序再次激活时重新启动。
在不使用观察者的情况下如何做到这一点?我在其他线程中读到这种方式不是一个好习惯,应用程序可能会崩溃。
override func viewDidLoad() {
super.viewDidLoad()
myView.startAnimations()
let notificationCenter = NotificationCenter.default
notificationCenter.addObserver(self, selector: #selector(appMovedToBackground), name: UIApplication.didEnterBackgroundNotification, object: nil)
notificationCenter.addObserver(self, selector: #selector(appMovedToForeground), name: UIApplication.willEnterForegroundNotification, object: nil)
notificationCenter.addObserver(self, selector: #selector(appBecomeActive), name: UIApplication.didBecomeActiveNotification, object: nil)
}
override func viewWillAppear(_ animated: Bool) {
myView.startAnimations()
}
override func viewDidDisappear(_ animated: Bool) {
myView.stopAnimations()
}
@objc func appMovedToBackground() {
myView.stopAnimations()
}
@objc func appMovedToForeground() {
myView.stopAnimations()
}
@objc func appBecomeActive() {
myView.startAnimations()
}
(使用“appMovedToForeground”的修复进行编辑)