ios - 如何在后台连续播放闹钟声音

Question

我正在开发一个应用程序，我想在其中播放闹钟。一旦我收到本地通知，闹钟就会在后台响起，并在我按下按钮时停止。

这是我的代码

NSDate *pickerDate = [self.timePicker date];
NSCalendar *calendar = [NSCalendar autoupdatingCurrentCalendar];
NSDateComponents *timeComponents = [calendar components:( NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit )
    fromDate:pickerDate];

NSDateComponents *dateComponents = [calendar components:( NSYearCalendarUnit | NSMonthCalendarUnit |  NSDayCalendarUnit )
    fromDate:pickerDate];

NSDateComponents *dateComps = [[NSDateComponents alloc] init];
[dateComps setDay:[dateComponents day]];
[dateComps setMonth:[dateComponents month]];
[dateComps setYear:[dateComponents year]];
[dateComps setHour:[timeComponents hour]];
[dateComps setHour:[timeComponents hour]];
NSLog(@"set hour component %ld",(long)[timeComponents hour]); // Notification will fire in one minute

[dateComps setMinute:[timeComponents minute]];
NSLog(@"set setMinute component %ld",(long)[timeComponents minute]);
[dateComps setSecond:[timeComponents second]];
NSDate *itemDate = [calendar dateFromComponents:dateComps];

UILocalNotification *localNotification = [[UILocalNotification alloc] init]; //Create the localNotification object
[localNotification setFireDate:itemDate]; 
//Set the date when the alert will be launched using the date adding the time the user selected on the timer

[localNotification setAlertAction:@"Open"]; //The button's text that launches the application and is shown in the alert
[localNotification setAlertBody:@"Wake up"]; //Set the message in the notification from the textField's text
localNotification.soundName = UILocalNotificationDefaultSoundName;
[localNotification setHasAction: YES]; //Set that pushing the button will launch the application
[localNotification setApplicationIconBadgeNumber:[[UIApplication sharedApplication] applicationIconBadgeNumber]+1];
//Set the Application Icon Badge Number of the application's icon to the current Application Icon Badge Number plus 1
[localNotification setUserInfo:[NSDictionary dictionaryWithObject:@"Alarm1" forKey:@"uid"]];
if (isRepeat) {
    localNotification.repeatInterval = NSDayCalendarUnit;
}

[[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
//Schedule the notification with the system

使用上面的代码，声音只播放 30 秒。我想让它连续播放。我搜索了很多但找不到。

谢谢

Answer 1

这是做不到的，我这么说的意思是当应用程序处于后台时，你不能像你在收到通知时所说的那样在后台播放声音。苹果推送和本地通知都不支持，只能添加提示音，不会一直播放。

如果你想在后台播放声音，只有当声音开始在前台播放而不是你在后台播放时才能完成，因为它只会使用 AVAudioPlayer Session PlayBack 在后台继续播放。

如果你认为你可以添加定时器，但定时器在后台也不起作用。