循环.wav文件

Question

我正在为iPhones制作一个报警应用程序，并希望继续循环音频，直到按钮再次被按下。到目前为止，它所做的只是播放音频一次时，按下。下面是代码：

-(IBAction)PlayAudioButton:(id)sender {

AudioServicesPlaySystemSound(PlaySoundID);

}

- (void)viewDidLoad {

NSURL *SoundURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"Sound" ofType:@"wav"]];

AudioServicesCreateSystemSoundID((__bridge CFURLRef)SoundURL, &PlaySoundID);

[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}

有什么建议吗？

Answer 1

使用AVAudioPlayer播放声音。您必须将AVFoundation.framework添加到您的项目中，才能使其工作。首先声明一个AVAudioPlayer对象。必须将其声明为具有strong属性的属性。

@property (strong, nonatomic) AVAudioPlayer *audioPlayer;

或作为具有__strong属性的实例变量

@interface Class : SuperClass //or @implementation Class
{
    AVAudioPlayer __strong *audioPlayer;
}

然后，为了加载和播放文件，

- (void)viewDidLoad
{
    NSString *audioFilePath = [[NSBundle mainBundle] pathForResource:@"Sound" ofType:@"wav"];
    NSURL *audioFileURL = [NSURL fileURLWithString:audioFilePath];
    audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:audioFileURL error:nil];
    audioPlayer.numberOfLoops = -1; //plays indefinitely
    [audioPlayer prepareToPlay];
}


- (IBAction)PlayAudioButton:(id)sender
{
    if ([audioPlayer isPlaying])
        [audioPlayer pause]; //or "[audioPlayer stop];", depending on what you want
    else
        [audioPlayer play];
}

当你想停止播放声音时，打电话

[audioPlayer stop];