如何在 swift 4 中访问应用程序委托中的视图控制器功能

Question

Xcode 给我错误“实例成员 'pauseGame322' 不能在类型 'ViewController' 上使用；您是否打算改用此类型的值？”

func applicationWillTerminate(_ application: UIApplication) {
    // Called when the application is about to terminate. Save data if  appropriate. See also applicationDidEnterBackground:.
    ViewController.pauseGame322(ViewController)
}

Answer 1

尝试在视图控制器中添加观察者

NotificationCenter.default.addObserver(self,
selector: #selector(applicationWillTerminate),
name: UIApplication.willTerminateNotification,
object: nil)

回调

@objc func applicationWillTerminate() {
    
     self.pauseGame322()
    
}