UILocalNotification根本不起作用 [英] UILocalNotification isn't working at all

问题描述

我在使用UILocalNotification时遇到了一些令人烦恼的问题.

I'm having some really irritating problems with UILocalNotification.

在完成我即将完成的应用程序的过程中，我注意到无论尝试如何，都无法获得本地通知.

While finishing up an app that I've nearly completed, I noticed that I couldn't get local notifications to work, no matter what I tried.

因此，我决定不浪费时间，而是回到基础知识，看看是否可以使它们完全正常工作.

So instead of wasting time, I decided to go back to basics and see if I could get them working at all.

我创建了一个新的基于XCode视图的应用程序，并用以下内容替换了-viewDidLoad:

I created a new XCode view-based application, and replaced -viewDidLoad with this:

- (void)viewDidLoad
{
    UILocalNotification * theNotification = [[UILocalNotification alloc] init];
    theNotification.alertBody = @"Alert text";
    theNotification.alertAction = @"Ok";
    theNotification.fireDate = [NSDate dateWithTimeIntervalSinceNow:10];

    [[UIApplication sharedApplication] scheduleLocalNotification:theNotification];
}

但是，这也什么都不做.
我希望在启动应用程序10秒钟后看到通知，但什么也没出现.
另外，我在iPhone和模拟器上都对此进行了测试.

However, that also doesn't do anything at all.
I expected to see a notification 10 seconds after launching the app, but nothing appears.
Also, I tested this on both my iPhone and the simulator.

我在这里错过了一些非常关键的东西吗? (我已经搜索了Apple文档，却找不到发生这种情况的任何原因)

Am I missing something really crucial here? (I've searched through the Apple documentation and couldn't find anything as to why this is happening)

谢谢

推荐答案

UILocalNotification仅在应用程序未运行(或在后台运行)时自动显示.如果应用程序正在运行并且触发了本地通知，则会调用UIApplicationDelegate的- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification方法，并且系统不会显示任何内容(也不会播放声音).如果要显示通知，请在委托方法中自己创建一个UIAlertView.

UILocalNotifications are only displayed automatically if the app is not running (or running in background). If the app is running and a local notification fires, UIApplicationDelegate’s - (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification method gets called and the system doesn’t display anything (nor does it play a sound). If you want to display the notification, create an UIAlertView yourself in the delegate method.

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