如何使AVAudioPlayer中的音频静音? [英] How to mute audio in AVAudioPlayer?

问题描述

我已经创建了AVAudioPlayer，现在我想在用户单击按钮时将其静音.

I have created AVAudioPlayer, Now I want to mute it when user click button.

这是我尝试过的:

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);
    }
}

推荐答案

if (player.volume = 1.0)和if (player.volume = 0.0)至少在两个级别上是错误的.首先，C不是Pascal-=运算符是一个赋值，可能是您指的是if (player.volume == 1.0).

if (player.volume = 1.0) and if (player.volume = 0.0) are erroneous at least on two levels. First, C is not Pascal - the = operator is an assignment, probably you meant if (player.volume == 1.0) instead.

两个，即使这样也没什么用-比较浮点数不执行任何操作您认为确实如此.您最好设置一个布尔型标志以指示播放器的状态(并省略else if部分，因为它是多余的):

Two, even this wouldn't be any good - comparing floating-point numbers does not do what you think it does. You better set a Boolean flag to indicate the state of the player (and omit the else if part since it's redundant):

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

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