ios - 在后台运行声音并播放音乐

Question

我正在构建一个正在运行的应用程序，它通过音频通知用户他们需要每隔几分钟开始运行或开始步行。即使使用 AVAudioPlayer 锁定屏幕，我也能够让声音在后台运行。

这是我所拥有的片段:

View Controller .h

@property (nonatomic, strong) AVAudioPlayer *audioWalk;

View Controller .m

- (void)viewDidLoad{
    [super viewDidLoad];
    // Walk Audio File
    NSString *soundFile2 = [[NSBundle mainBundle] pathForResource:@"Walk" ofType:@"wav"];
    audioWalk = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:soundFile2] error:nil];

    // Load the audio into memory
    [audioWalk prepareToPlay];

    // Permit the timer to run in the background
    bgTask = 0;
    UIApplication  *app = [UIApplication sharedApplication];
    bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
        [app endBackgroundTask:bgTask];
    }];

    // Prevent the application from going to sleep while it is running
    [UIApplication sharedApplication].idleTimerDisabled = YES;

    // Starts recieving remote control events and is the first responder
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    [self becomeFirstResponder];

    // Plays audio
    [audioWarmup play];

}

我试图弄清楚如何在不中断后台播放的音乐的情况下播放我的音频。此外，声音需要在后台和屏幕锁定时播放。任何帮助将非常感激!

Answer 1

我能够修复它。这是我在下面所做的。此解决方案允许音频文件在后台运行，即使在锁定屏幕的情况下，也不会中断或暂停来自其他应用程序(尤其是音乐)的音频。

- (void)viewDidLoad{
    [super viewDidLoad];

    // Play audio even if lock screen is on, the with options allows audio from other applications to play without interruption
    [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback withOptions:AVAudioSessionCategoryOptionMixWithOthers error: nil];
    [[AVAudioSession sharedInstance] setActive: YES error:nil];

    // Walk Audio File
    NSString *soundFile2 = [[NSBundle mainBundle] pathForResource:@"Walk" ofType:@"wav"];
    audioWalk = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:soundFile2] error:nil];

    // Load the audio into memory
    [audioWalk prepareToPlay];

    // Permit the timer to run in the background
    bgTask = 0;
    UIApplication  *app = [UIApplication sharedApplication];
    bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
        [app endBackgroundTask:bgTask];
    }];

    // Prevent the application from going to sleep while it is running
    [UIApplication sharedApplication].idleTimerDisabled = YES;

    // Starts receiving remote control events and is the first responder
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    [self becomeFirstResponder];

    // Plays audio
    [audioWarmup play];

}