在 ViewController 中播放时从 SKScene 静音 AVAudioPlayer

Posted 2023-02-23

【中文标题】在 ViewController 中播放时从 SKScene 静音 AVAudioPlayer

【英文标题】：muting AVAudioPlayer from SKScene while its playing in ViewController

【发布时间】：2014-02-25 08:41:19

【问题描述】：

我有一个 AVAudioPlayer 设置为在 ViewController.m 中无限循环。 我的问题是我将如何从 SKScene 中静音 AVAudioPlayer

//ViewController.m

- (void)viewDidLoad

    [super viewDidLoad];

    NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"Space theme2"  ofType:@"mp3"]];
    _music = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
    [_music prepareToPlay];
    [_music setVolume:0.5];
    _music.numberOfLoops = -1;
    [_music play];

所以 AVAudioPlayer 正在 ViewController.m 中播放，需要在 SKScene 中静音/取消静音。

//SKScene.m

if ([node.name isEqualToString:@"Mute"]) 
    //Mute Music "[_music setVolume:0.0]; isn't doing anything"
    self.Mute.position = CGPointMake(-100, self.Mute.position.y);
    self.Unmute.position = CGPointMake(160, self.Unmute.position.y);

if ([node.name isEqualToString:@"Unmute"]) 
    //Unmute Music [_music setVolume:0.5]; isn't doing anything"
    self.Mute.position = CGPointMake(160, self.Mute.position.y);
    self.Unmute.position = CGPointMake(-100, self.Unmute.position.y);

感谢任何帮助

【参考方案1】：

通过使用NSNotificationCenter：

//ViewController.m

- (void)awakeFromNib 
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(stopMusic:)
                                                 name:@"StopMusic"
                                               object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(playMusic:)
                                                 name:@"PlayMusic"
                                               object:nil];


- (void)viewDidLoad

    [super viewDidLoad];

    NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"Space theme2"  ofType:@"mp3"]];
    _music = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
    [_music prepareToPlay];
    [_music setVolume:0.5];
    _music.numberOfLoops = -1;
    [_music play];


- (void)stopMusic:(NSNotification*)notification 
    [_music stop];


- (void)playMusic:(NSNotification*)notification 
    [_music play];


- (void) dealloc

    // If you don't remove yourself as an observer, the Notification Center
    // will continue to try and send notification objects to the deallocated
    // object.
    [[NSNotificationCenter defaultCenter] removeObserver:self];

.

// Scene.m:

if ([node.name isEqualToString:@"Mute"]) 
    [[NSNotificationCenter defaultCenter]
         postNotificationName:@"StopMusic" object:self];
    self.Mute.position = CGPointMake(-100, self.Mute.position.y);
    self.Unmute.position = CGPointMake(160, self.Unmute.position.y);

if ([node.name isEqualToString:@"Unmute"]) 
    [[NSNotificationCenter defaultCenter]
         postNotificationName:@"PlayMusic" object:self];
    self.Mute.position = CGPointMake(160, self.Mute.position.y);
    self.Unmute.position = CGPointMake(-100, self.Unmute.position.y);

【讨论】：

非常感谢，很好的回答！

【参考方案2】：

您可以使用 NSNotification 或委托方法。您可以查看here 和here。