如何在iPhone的后台播放音频? [英] How to Play Audio in background in IPhone?

问题描述

我正在尝试在设置的特定时间播放音频文件.为此，我在info.plist的"UIBackgroundModes"中添加了音频，在didEnterBackground中的backgroundtaskidentifier中添加了音频.它可以在模拟器中工作，但不能在设备中工作.解决这个问题.

I'm trying to play audio file at particular time which i have set.for that I have added audio in "UIBackgroundModes" in info.plist and backgroundtaskidentifier in didEnterBackground.Its working in simulator but not in device.Can anyone help to solve this.

预先感谢...

推荐答案

您可以使用以下方法查看此参考应用音频流和背景.

You can check out this reference app with streaming and backgrounding of audio.

带有声音的本地通知示例. 更多详细信息.. >

Example of a local notification w/ attached sound. More detail here.

- (void)applicationDidEnterBackground:(UIApplication *)application {
    NSLog(@"Application entered background state.");
    // bgTask is instance variable
    NSAssert(self->bgTask == UIInvalidBackgroundTask, nil);

    bgTask = [application beginBackgroundTaskWithExpirationHandler: ^{
        dispatch_async(dispatch_get_main_queue(), ^{
            [application endBackgroundTask:self->bgTask];
            self->bgTask = UIInvalidBackgroundTask;
        });
    }];

    dispatch_async(dispatch_get_main_queue(), ^{
        while ([application backgroundTimeRemaining] > 1.0) {
            NSString *friend = [self checkForIncomingChat];
            if (friend) {
                UILocalNotification *localNotif = [[UILocalNotification alloc] init];
                if (localNotif) {
                    localNotif.alertBody = [NSString stringWithFormat:
                        NSLocalizedString(@"%@ has a message for you.", nil), friend];
                    localNotif.alertAction = NSLocalizedString(@"Read Message", nil);
                    localNotif.soundName = @"alarmsound.caf";
                    localNotif.applicationIconBadgeNumber = 1;
                    [application presentLocalNotificationNow:localNotif];
                    [localNotif release];
                    friend = nil;
                    break;
                }
            }
        }
        [application endBackgroundTask:self->bgTask];
        self->bgTask = UIInvalidBackgroundTask;
    });

}

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