Question

我正在尝试使用会在iPhone上触发音频警报的WatchKit应用程序。我已经设置了触发器，每5秒钟重复一次。在iPhone上，我有在后台播放短音频wav文件的逻辑。即使应用程序最小化并播放音频，它也可以正常工作。我已经在iphone上单独测试过，工作正常。

无效的步骤是手表上的触发器告诉父Iphone应用播放音频。除了2秒钟的音频警报可能被缩短了0.5秒之外，它大部分都有效。它起到了第一部分的啁啾，被切断了。每当我触发它时，它都会对整个wav声音进行剪切啁啾。

来自父应用程序的回复很好，我想知道一旦回复所有后台处理完全被切断。

我在应用程序中启用了音频的后台模式。

如何让手表触发应用在后台播放整个音频提示？

// WatchApp InterfaceController 
- (void)pingIphone {
    [WKInterfaceController openParentApplication:@{@"requestString":@"findphone"} reply:^(NSDictionary *replyInfo, NSError *error) {
        NSLog(@"\nReply info: %@\nError: %@",replyInfo, error);
    }];
}

//  Iphone AppDelegate
- (void)application:(UIApplication *)application handleWatchKitExtensionRequest:(NSDictionary *)userInfo reply:(void(^)(NSDictionary *replyInfo))reply {
    NSString * request = [userInfo objectForKey:@"requestString"];

    NSDictionary * replyContent = @{@"state":(application.applicationState == UIApplicationStateBackground ? @"back" : @"not back")};

    if ([request isEqualToString:@"findphone"]){
            ViewController *vc = [[ViewController alloc] init];
            [vc pingIphone];
    }

    reply(replyContent);
}

// Iphone ViewController
@property (strong, nonatomic)  AVQueuePlayer *player;

- (void)viewDidLoad {
    [super viewDidLoad];

    // get device's default audio level on start
    AudioSessionInitialize(NULL, NULL, NULL, NULL);
    AudioSessionSetActive(true);

    Float32 volume;
    UInt32 dataSize = sizeof(Float32);
    AudioSessionGetProperty (
                          kAudioSessionProperty_CurrentHardwareOutputVolume,
                         &dataSize,
                         &volume
                         );

    [[AVAudioSession sharedInstance] setActive:YES error:nil];
    [[AVAudioSession sharedInstance] addObserver:self forKeyPath:@"outputVolume" options:NSKeyValueObservingOptionNew context:nil];
}


(void)pingIphone {
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

    if([userDefaults boolForKey:@"vibrate_bool"] == YES){
        AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);
    }

    for(int i = 0; i < 5; i++){
        [_player insertItem:[AVPlayerItem playerItemWithURL:[[NSBundle mainBundle] URLForResource:@"alarm" withExtension:@"wav"]] afterItem:nil];
    }

    //NSLog(@"volume: %f",[userDefaults floatForKey:@"volume"]);
    if (!(_player.rate > 0 && !_player.error)) {
        [self startAudio];
    }
}

- (void)startAudio {
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];

    [[AVAudioSession sharedInstance] setDelegate: self];
    NSError *setCategoryError = nil;
    [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error: &setCategoryError];

    NSString* path = [[NSBundle mainBundle] pathForResource:@"alarm"  ofType:@"wav"];

    _player = [[AVQueuePlayer alloc] init];

    for(int i = 0; i < 5; i++){
        [_player insertItem:[AVPlayerItem playerItemWithURL:[NSURL fileURLWithPath:path]] afterItem:nil];
    }

    _player.volume = [userDefaults floatForKey:@"volume"];
    [_player play];


    if (setCategoryError)
        NSLog(@"Error setting category! %@", setCategoryError);
}

Answer 1

听起来你的应用程序被操作系统杀死了。请查看此答案以获取一些建议：https://stackoverflow.com/a/29848521/3704092

是的，如果您不使用后台任务，则在致电reply()后处理结束。

handleWatchKitExtensionRequest在iphone

1 个答案: