多种方法：按钮的目标和选择器不工作

试图解决我的Other question。这次尝试这种方式为一个按钮添加了多个方法，但是当点击按钮时，它看起来没有任何东西看起来像这些方法不起作用。多种方法：按钮的目标和选择器不工作

//Add Play Button 

UIButton *playpauseButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
[playpauseButton addTarget:self action:@selector(playAction:) forControlEvents:UIControlEventTouchUpInside]; 
[playpauseButton addTarget:self action:@selector(playpauseAction:) forControlEvents:UIControlEventTouchUpInside]; 
playpauseButton.frame = CGRectMake(0, 0, 30, 30); 
[playpauseButton setImage:[UIImage imageNamed:@"Play Icon.png"] forState:UIControlStateNormal]; 
[playpauseButton setImage:[UIImage imageNamed:@"pause.png"] forState:UIControlStateSelected]; 
UIBarButtonItem *play = [[UIBarButtonItem alloc] initWithCustomView:playpauseButton]; 


- (void)playAction:(id)sender{ 
[audioPlayer play]; 
self.timer = [NSTimer scheduledTimerWithTimeInterval:11.0 
               target:self 
              selector:@selector(displayviewsAction:) 
              userInfo:nil 
              repeats:NO]; 
} 

-(void)playpauseAction:(id)sender { 
     if ([audioPlayer isPlaying]){ 
      [sender setImage:[UIImage imageNamed:@"Play Icon.png"] forState:UIControlStateSelected]; 
      [audioPlayer pause]; 
      [self pauseTimer]; 
    } else {  
     [sender setImage:[UIImage imageNamed:@"pause.png"] forState:UIControlStateNormal]; 
     [audioPlayer play]; 
     [self resumeTimer]; 
     self.timer = [NSTimer scheduledTimerWithTimeInterval:11.0 
             target:self 
             selector:@selector(displayviewsAction:) 
             userInfo:nil 
             repeats:NO]; 
     }   
} 

-(void)pauseTimer{ 
pauseStart = [[NSDate dateWithTimeIntervalSinceNow:0] retain]; 
previousFireDate = [[timer fireDate] retain]; 
[timer setFireDate:[NSDate distantFuture]]; 
} 
-(void)resumeTimer{ 
float pauseTime = -1*[pauseStart timeIntervalSinceNow]; 
[timer setFireDate:[previousFireDate initWithTimeInterval:pauseTime sinceDate:previousFireDate]]; 
[pauseStart release]; 
[previousFireDate release]; 
}

它显示播放按钮时，点击它没有任何反应。它应播放音频文件，启动NSTimer，开始加载视图并在播放和暂停按钮之间切换。任何想法是什么错误。

谢谢。

来源

2012-06-15 user1452248

当用户点击按钮时，playAction:调用[audioPlayer play]。紧接着，playpauseAction:评估[audioPlayer isPlaying]到YES并确实[audioPlayer pause]。

来源

2012-06-15 17:37:02 thelaws

不，它不暂停音频播放器，因为它应该显示没有发生的暂停图标。 – user1452248

@ user1452248您在if语句的同一分支中为UIControlStateSelected设置了“Play Icon.png”。 – thelaws

好吧，我已经切换了方法的顺序[playpauseButton addTarget：self action：@selector（playpauseAction :) forControlEvents：UIControlEventTouchUpInside]; [playpauseButton addTarget：self action：@selector（playAction :) forControlEvents：UIControlEventTouchUpInside];现在它正在播放音频文件，在播放暂停按钮之间切换，但现在暂停按钮不会切换回播放按钮，如果再次按下恢复 – user1452248

多种方法：按钮的目标和选择器不工作

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