Question

我广告使用以下代码从网上下载AMR文件并按AVAudioPlayer播放，但所有时间都出现unrecongnize selector sent to instance错误。

这是开始下载和播放的方法：

- (IBAction)DisplayAudioPlayView:(id)sender 
{    
    [self InitializePlayer];   
}

-(void) InitializePlayer
{
    // Get the file path to the doa audio to play.
    NSString *filePath = [[ServerInteraction instance] getAudio:audioData.ID];

    // Convert the file path to a URL.
    NSURL *fileURL = [[NSURL alloc] initFileURLWithPath: filePath];

    //Initialize the AVAudioPlayer.
    audioPlayer=  [AVPlayer playerWithURL:fileURL] ;
    audioPlayer.delegate= self; //THIS LINE CAUSE ERROR//

    // Preloads the buffer and prepares the audio for playing.
    [audioPlayer prepareToPlay];
    audioPlayer.currentTime = 0;

    [audioPlayer play]
}

修改

基于@Michael建议我更改我的代码，post我将代码更改为：

NSURL *fileURL = [[NSURL alloc] initWithString: @"http://www.domain1.com/mysound.mp3"];

//Initialize the AVAudioPlayer.
audioPlayer=  [AVPlayer playerWithURL:fileURL];
[audioPlayer play];

现在它播放了声音，但是当我使用http://maindomain.com/mysound.amr时，它没有播放声音。

Answer 1

检查以下几点：

不再支持AMR（对于≥iOS4.3，请参阅supported audio formats in the Apple iOS SDK Documentation）。
您想使用AVPlayer（音频和视频）还是只想要音频？仅用于音频AVAudioPlayer。以下代码段显示了如何处理它。
如果您想使用AVAudioPlayer，您的自我实例是否会实现AVAudioPlayerDelegate Protocol？
您的自我实例是否实现了AVAudioPlayerDelegate Protocol？

您是否正确添加并链接了AVAudioFoundation框架（#import <AVFoundation/AVFoundation.h>）？

- (void)viewDidLoad
{
    [super viewDidLoad];
    NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"audio" ofType:@"m4a"]];

    NSError *error = noErr;
    self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
    if (error)
    {
        NSLog(@"Error in audioPlayer: %@", [error localizedDescription]);
    }
    else 
    {
        self.audioPlayer.delegate = self;
        [self.audioPlayer prepareToPlay];
    }
}

- (void)playAudio
{
    [self.audioPlayer play];
}

AVAudioPlayer不播放AMR文件

1 个答案: