启动和停止声音（提供代码）iOS

Question

我只有一个声音，它通过服务器通过http播放。 但是它可以通过我的服务器成功播放，但声音似乎并没有停止。 我试图将其编码为停止，但是我没有运气。 感谢帮助

- (IBAction)oneSound:(id)sender; {
    if (ButtonAlReadyClicked == 1) 
    {
        ButtonAlReadyClicked = 2;

        [sender setBackgroundImage:[UIImage imageNamed:@"m2.png"] forState:UIControlStateNormal];

    }
    else if (ButtonAlReadyClicked == 2) 
    {
        ButtonAlReadyClicked = 1;

        [sender setBackgroundImage:[UIImage imageNamed:@"m1.png"] forState:UIControlStateNormal];

    }  
    if (player && player.playing) {
        [player stop];
        [player release];
        player = nil;
        return;
    }    

    AVPlayer *player = [[AVPlayer playerWithURL:[NSURL URLWithString:@"http://www.mysite.com/hi.mp3"]] retain];

    [player play];

}

我得到的错误是'错误：使用未声明的标识符'player'[3]

Answer 1

if (player …行始终返回false，因为您将player作为本地变量，而不是实例ivar。将一个player ivar添加到您的.h文件中，然后将您初始化的那个保存到该文件中，而不是保存到本地播放器中。

Answer 2

您需要在.h文件中声明一个名为player和实例化播放器的变量，单击该按钮即可。 出现错误的原因是，在尝试访问变量及其属性后，声明了player变量。

- (IBAction)oneSound:(id)sender {
    if (player == nil) {
        player = [[AVPlayer playerWithURL:[NSURL URLWithString:@"http://www.mysite.com/hi.mp3"]] retain];
        [player play];
        ButtonAlReadyClicked = 1;
        [self oneSound:sender];
        return;
    }
    if (ButtonAlReadyClicked == 1) {
        ButtonAlReadyClicked = 2;
        [sender setBackgroundImage:[UIImage imageNamed:@"m2.png"] forState:UIControlStateNormal];
    }
    else if (ButtonAlReadyClicked == 2) 
    {
        ButtonAlReadyClicked = 1;
        [sender setBackgroundImage:[UIImage imageNamed:@"m1.png"] forState:UIControlStateNormal];
    }  
    if (player && player.playing) {
        [player stop];
        [player release];
        player = nil;
        return;
    }    

}