ios如何在后台运行闹钟声音

Question

我正在开发闹钟应用程序。在同时报警播放声音，如果应用程序是开放的（前景）的时间则执行

- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification 

方法&报警声成功播放。

但在播放闹钟声时，如果我的应用程序处于不活动/背景状态，则不会调用上述方法。

所以有什么办法可以让我在后台播放闹钟声音。现在，当我的应用程序在后台时，只有通知到达&没有声音/歌曲正在播放。

下面是我的代码

-(void)application:(UIApplication *)application didReceiveLocalNotification(UILocalNotification *)notification 
{ 
     musicPlayer = [MPMusicPlayerController applicationMusicPlayer]; 

     [musicPlayer setQueueWithItemCollection:collection]; 
     [musicPlayer play]; 

     [self showReminder:@"Alarm ON!"]; 
} 

- (void)showReminder:(NSString *)text 
{ 
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Alarm" 
                 message:text delegate:self 
               cancelButtonTitle:nil 
               otherButtonTitles:@"Snooze",@"Ok",nil]; 
    [alertView show]; 

} 

我只是想知道，当应用程序处于非活动状态/背景也显示警告，停止/暂停闹钟怎么能播放歌曲。

请帮帮我。

Answer 1

对于前景： -application:didReceiveLocalNotification:

背景： -application:handleActionWithIdentifier:forLocalNotification:completionHandler:

但Apple建议，

Note: An alarm is not intended to serve as a UILocalNotification. An alarm requires you to create an event or reminder that is visible in the user’s Calendar or Reminders app. A UILocalNotification is better suited for general purposes that don’t involve the Calendar database.

Apple Documentation about Configuring Alarms

Answer 2

下面是我的代码，你的mabey试试吧！

- (void)applicationDidEnterBackground:(UIApplication *)application{ 
musicPlayer = [MPMusicPlayerController applicationMusicPlayer]; 

    [musicPlayer setQueueWithItemCollection:collection]; 
    [musicPlayer play]; 

    [self showReminder:@"Alarm ON!"]; 
}