当我恢复应用程序时 iOS 崩溃：“applicationDidBecomeActive:]: unrecognized selector sent to instance”

我有一个观察者检查应用程序何时变为活动状态并调用applicationDidBecomeActive. 当我删除该代码时，没有任何崩溃，但我需要该代码。

我调用addActiveObserverinViewDidAppear和removeActiveObserverin ViewDidDisappear，但是当我在每个上设置断点时，只会ViewDidAppear被击中。

当我点击主页按钮然后再次点击应用程序时，出现以下崩溃：

applicationDidBecomeActive:]: unrecognized selector sent to instance

viewDidAppear/ viewDidDisappear:

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    addActiveObserver()
}
override func viewDidDisappear(_ animated: Bool) {
    super.viewDidDisappear(animated)
    removeActiveObserver()
}

addActiveObserver / removeActiveObserver

func addActiveObserver() {
    NotificationCenter.default.addObserver(
        self,
        selector: #selector(UIApplicationDelegate.applicationDidBecomeActive(_:)),
        name: NSNotification.Name.UIApplicationDidBecomeActive,
        object: nil)
}
func removeActiveObserver() {
    NotificationCenter.default.removeObserver(self,
                                      name:NSNotification.Name.UIApplicationDidBecomeActive,
                                      object:nil)
}

applicationDidBecomeActive：

func applicationDidBecomeActive(_ notification: Notification) {
    // Do work
}