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我使用 uibuttons 创建了一个网格视图，现在需要在单击时选择和取消选择按钮。一切正常，但是当我尝试在单击按钮时播放声音时，应用程序通过在控制台中打印以下消息而崩溃：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIButton prepareToPlay]: unrecognized selector sent to instance 0x7526a20'

为了播放声音，我在 .h 文件中获取了 AVAudioPlayer claas 的对象并在视图中初始化它确实加载方法并在按钮单击时播放它，这是我的代码 .h 文件

#import <UIKit/UIKit.h>
#import <AVFoundation/AVAudioPlayer.h>
#import <AudioUnit/AudioUnit.h>

@interface PlayViewController : UIViewController<AVAudioPlayerDelegate>
{
    IBOutlet UIButton *resetBtn;
    UIButton *btn[25];
    AVAudioPlayer *tapSound;

}
-(IBAction)reserBtnClkd;
@property(nonatomic,retain) AVAudioPlayer *tapSound;

@end
in .m file
- (void)viewDidLoad
{
    [super viewDidLoad];
    [self.view setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"background.png"]]];
     NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSString *path=[[NSBundle mainBundle] pathForResource:@"button-3" ofType:@"wav"];
    AVAudioPlayer *Tapsound=[[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
    self.tapSound=Tapsound;
    [Tapsound release];
    [pool release];
    [self setTheIcons];
    resetBtn.layer.cornerRadius=6.0;
    resetBtn.backgroundColor=[UIColor colorWithRed:90/255.00 green:33.00/255.00 blue:179.00/255.00 alpha:1];
    resetBtn.titleLabel.font=[UIFont fontWithName:@"Helvetica" size:22];
    [resetBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
}

#pragma mark
#pragma mark<Creating The Grid View Of Icons>
#pragma mark

-(void) setTheIcons
{
    int x=11;
    int y=55;

    for(int i=1;i<=25;i++)
    {
        btn[i]=[UIButton buttonWithType:UIButtonTypeCustom];
        btn[i].frame=CGRectMake(x, y, 58,58);
        [btn[i] addTarget:self action:@selector(btnClkd:) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:btn[i]];

        if(i%5==0)
        {
            x=11;
            y=y+60;
        }
        else
        {
            x=x+60;
        }
    }
    [self reserBtnClkd];
}

-(void)btnClkd:(UIButton*)sender
{
    sender.selected=!sender.selected;

    if(sender.selected)
    {
       // UIView *tempView=[[UIView alloc]initWithFrame:CGRectMake(12, 12, 34, 34)];
        UIView *tempView=[[UIView alloc]initWithFrame:CGRectMake(0, 0, 58, 58)];
        tempView.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:@"hover-effectNew.png"]];
        tempView.userInteractionEnabled=NO;
        [sender addSubview:tempView];
        [tempView release];
    }
    else
    {
        NSArray *subviewToRemove=[sender subviews];
        int i=1;
        for(UIView *view in subviewToRemove)
        {
            if(i==2)
            {
            [view removeFromSuperview];
            }
            i++;
        }
    }
    [self.tapSound prepareToPlay];
    [self.tapSound setDelegate:self];
    [self.tapSound play];

}

奇怪的是，只有当我在按钮单击方法上播放声音时，应用程序才会崩溃，否则如果我在视图中播放它确实加载了它就可以正常工作，抓了两天但找不到任何解决方案，请帮忙我

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2 回答 2

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I think that the problem is that your self.tapSound is an UIButton(you can see it in the crash log: '-[UIButton prepareToPlay]: unrecognized selector sent to instance 0x7526a20'.

Try debugging it step by step and see what happens

于 2012-09-26T06:54:44.550 回答
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我认为因为self.tapSound是引用Tapsound，所以当你调用[Tapsound release]它时也会释放属性。我建议直接实例化该属性，如下所示：

/*note that you have declared tapSound in your .h 
as a class variable in addition to being a property.
This means you can access it as both.
Wherever you would type self.tapSound, instead use simply tapSound
*/

tapSound = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:path] error:NULL];
于 2012-09-26T07:35:55.460 回答