我正在為Swift編寫的iOS游戲。我試圖找到一種方法來檢測應用程序何時進入后臺模式或由于其他原因而中斷，例如電話，但找不到任何東西。我該怎么做？
3 回答
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TA貢獻1802條經驗 獲得超10個贊
編輯/更新：Xcode 10?Swift 4.2
您可以將觀察者添加到視圖控制器中 UIApplication.willResignActiveNotification
NotificationCenter.default.addObserver(self, selector: #selector(willResignActive), name: UIApplication.willResignActiveNotification, object: nil)
并向您的視圖控制器添加選擇器方法，該方法將在您的應用收到該通知時執行：
@objc func willResignActive(_ notification: Notification) {
// code to execute
}
達令說
TA貢獻1821條經驗 獲得超6個贊
在Swift 4和iOS 12中：要觀察應用程序進入后臺事件，請將此代碼添加到您的viewDidLoad（）方法中。
let notificationCenter = NotificationCenter.default
notificationCenter.addObserver(self, selector: #selector(appMovedToBackground), name: UIApplication.didEnterBackgroundNotification, object: nil)
@objc func appMovedToBackground() {
// do whatever event you want
}
您必須使用UIApplication.didEnterBackgroundNotification。如果要觀察應用程序是否進入前臺事件，請使用UIApplication.willEnterForegroundNotification
因此，完整的代碼將是：
override func viewDidLoad() {
super.viewDidLoad()
let notificationCenter = NotificationCenter.default
notificationCenter.addObserver(self, selector: #selector(appMovedToBackground), name: UIApplication.didEnterBackgroundNotification, object: nil)
notificationCenter.addObserver(self, selector: #selector(appCameToForeground), name: UIApplication.willEnterForegroundNotification, object: nil)
// Do any additional setup after loading the view.
}
@objc func appMovedToBackground() {
print("app enters background")
}
@objc func appCameToForeground() {
print("app enters foreground")
}
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