Ios4 如何在按下按钮时播放MP3？

有人能给我一个例子代码，告诉我如何用按键播放声音吗

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我想使用AVAudioPlayer播放MP3文件，类似的内容应该会让您开始。将其添加到视图控制器，然后将按钮连接到interface builder中的playAudio操作

在你的头上

#import <AVFoundation/AVFoundation.h>

@interface ClassName {
    ...
    AVAudioPlayer *audioPlayer;
}
@property (nonatomic, retain) AVAudioPlayer *audioPlayer;

- (IBAction) playAudio;

//ViewController.h，写下面的代码
@界面ViewController:UIViewController
//将属性分配给玩家
@属性（非原子，保留）AVAudioPlayer*玩家；
//然后在ViewDidLoad方法中写入ViewController.m文件
N错误*声音错误；
NSString*path=[[NSBundle mainBundle]pathForResource:@“soundFileName”的类型：@“mp3”]；/。mp3播放器文件
NSURL*文件=[[NSURL alloc]initFileURLWithPath:path]//路径
_player=[[AVAudioPlayer alloc]initWithContentsOfURL:文件错误：&soundError]//玩家对象
如果（_player==nil）
{
NSLog（@“播放器因%@”而为空，soundError）；
}
其他的
{
[玩家玩]；
_播放器。音量=1.0；
[_playersetdelegate:self]；
}
//对于停止播放器，您可以使用
//[玩家停止]//要停止此行时，请取消对其注释。

请参见[如何在iPhone上以编程方式播放MP3？]（）。

@synthesize audioPlayer;

- (IBAction) playAudio {
    NSURL *url = [[NSBundle mainBundle] URLForResource:@"audio" withExtension: @"m4a"];
    if (!url){NSLog(@"file not found"); return;}
    NSError *error;
    self.audioPlayer = [[[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error] autorelease];
    [audioPlayer play]
}

//ViewController.h ,write below code
@interface ViewController : UIViewController<AVAudioRecorderDelegate,AVAudioPlayerDelegate>

//assign property to player
 @property(nonatomic,retain) AVAudioPlayer *player;

//then write in ViewController.m file in ViewDidLoad Method

NSError *soundError;
NSString *path=[[NSBundle mainBundle]pathForResource:@"soundFileName" ofType:@"mp3"]; //.mp3 file for player
NSURL *file=[[NSURL alloc]initFileURLWithPath:path]; //path
_player=[[AVAudioPlayer alloc]initWithContentsOfURL:file error:&soundError]; //player Object

if(_player == nil)
{
    NSLog(@"player is empty because of %@",soundError);
}
else
{
    [_player play];
    _player.volume=1.0;
    [_player setDelegate:self];

}

// for stop player you can use 
    // [_player stop]; //uncomment this line when you wants to stop it.