如何在Xamarin iOS中使用applicationDidBecomeActive？

Question

如何在Xamarin iOS中做到这一点？

从后台打开应用程序时未调用ViewDidAppear

下面的链接在AppDelegate中提到了Xamarin的OnActivated方法，但是我如何订阅ViewController，以便它知道该应用何时来自后台？

https://forums.xamarin.com/discussion/10594/where-is-applicationdidbecomeactive-in-xamarin-ios

Answer 1

    NSObject notificationObserver = NSNotificationCenter.DefaultCenter.AddObserver (UIApplication.DidBecomeActiveNotification, DoStuff);

    private void DoStuff (NSNotification a_notification)
    {
        // DO STUFF HERE
    }