如何开始使用MonoTouch的有关我的应用程序通知被关闭/发送到后台？ [英] How to get notified with MonoTouch about my application being closed/sent to background?

问题描述

虽然我觉得这是一个相当琐碎的问题，我找不到任何答案在那里

Although I think this is a fairly trivial question, I could not find any answers out there.

我的问题是：

有没有办法让一个MonoTouch的iPhone应用程序的通知时，我的应用程序被关闭或发送到后台（点击home键的用户）？

Is there a way to get a notification in a MonoTouch iPhone application when my application is being closed or sent to background (by a user clicking the home button)?

我以为 WillTerminate 覆盖好作这一点，但在调试器，它永远不会被调用。

I thought the WillTerminate override was good for this, but in the debugger, it is never called.

推荐答案

有两种方式，当一个应用程序转到得到通知背景：

There are two ways to get notified when an app goes to the background:

一。覆盖适当的方法在你的AppDelegate：

a. Override the appropriate method in your AppDelegate:

public override void DidEnterBackground(UIApplication application)
{
    // App entered background, do some light stuff here, 
    // there is not much time before getting suspended
}

$ b之前多少时间
$ b

乙。通过NSNotificationCenter类新增通知观察家：

b. Add notification observers through the NSNotificationCenter class:

 NSObject observer = NSNotificationCenter.DefaultCenter.AddObserver(
    UIApplication.DidEnterBackgroundNotification, 
    delegate(NSNotification ntf) {

            // Same as above
    });

您可以使用NSObject的对象从的addObserver方法返回删除的观察者，当你不再需要它

You can use the NSObject object returned from the AddObserver method to remove the observer when you no longer need it:

NSNotificationCenter.DefaultCenter.RemoveObserver(observer);

这篇关于如何开始使用MonoTouch的有关我的应用程序通知被关闭/发送到后台？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！