Question

我创建了AVAudioPlayer，现在我想在用户点击按钮时将其静音。

我在这里尝试过：

player.volume = 1.0  //when first time i initiate my player


- (IBAction)speakerOnOff:(id)sender {
    if (player.volume == 1.0) {

        [player setVolume: 0.0];

        NSLog(@"1volume is:%f",player.volume);
    }else if (player.volume == 0.0) {

        [player setVolume: 1.0];

        NSLog(@"2volume is:%f",player.volume);
    }
}

Answer 1

if (player.volume = 1.0)和if (player.volume = 0.0)至少在两个级别上都是错误的。首先，C不是Pascal - =运算符是一个赋值，可能你的意思是if (player.volume == 1.0)。

二，即使这不是什么好事 - 比较浮点数does not do what you think it does。你最好设置一个布尔标志来指示播放器的状态（并省略else if部分，因为它是多余的）：

- (IBAction)speakerOnOff:(id)sender
{
    static BOOL muted = NO;
    if (muted) {
        [player setVolume:1.0];
    } else {
        [player setVolume:0.0];
    }
    muted = !muted;
}

Answer 2

swift 2+解决方案

    let musicPlayer:AVAudioPlayer = AVAudioPlayer()
    var IsMuted:Bool = false

    if IsMuted == false {
      IsMuted = true
      musicPlayer.volume = 0
    } else {
      IsMuted = false
      musicPlayer.volume = 1
    }

- ＆GT;不要忘记setCategory到AVAudioSessionCategoryAmbient

do {
      try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryAmbient)
      try AVAudioSession.sharedInstance().setActive(true)
    } catch _ {
      return print("couldn't set session")
    }

如何在AVAudioPlayer中静音？

2 个答案: