如何创建双功能按钮？

Question

我有一个应用程序有一个开始按钮（与播放图像）。一旦开始按钮被点击，下一次点击应该像一个暂停按钮（也是按钮图像的改变）。我们怎样才能实现这个功能与图像改变一个用于播放和另一个用相同的按钮暂停？

Answer 1

- (IBAction)buttonClicked:(id)sender 
{ 

UIButton *button = (UIButton *)sender; 
[button setImage:pauseImage forState:state]; 
//Do things 
} 

Answer 2

试试这个

-(void)playClicked:(id)sender{ 

UIButton *tappedButton = (UIButton*)sender; 

if([tappedButton.currentImage isEqual:[UIImage imageNamed:@"play.png"]]) { 
    [sender setImage:[UIImage imageNamed: @"pause.png"] forState:UIControlStateNormal]; 
} 

else { 
    [sender setImage:[UIImage imageNamed:@"play.png"]forState:UIControlStateNormal]; 
} 
} 

所有最优秀的。

Answer 3

我会在点击方法中有一个布尔值，如果它已经播放或不播放，它将保持跟踪。如果不是正在播放，请将其启动并将图像设置为暂停图像，如果正在播放，则再次按下该按钮即可执行所需操作，即暂停和更改图像。

这个循环会在点击方法：

if(playing) { 
    //if the button is pressed and its already playing, pause or do whatever here 
    [button setImage:startImage forState:normal]; 
    playing = NO; 
} else { 
    [button setImage:pauseImage forState:normal]; 
    playing = YES; 
} 

Answer 4

这是怎么我会处理这件事

在你的viewController定义中定义布尔

BOOL playing; 

然后在按钮您应该采取类似行动

-(IBAction)playPauseButtonClicked:(id)sender 
{ 
    if (playing) 
    { 
     [self pauseButtonClicked]; 
    } 
    else 
    { 
     [self playButtonClicked]; 
    } 

    UIButton *theButton = (UIButton *)sender; 

    playing = !playing; 
    [theButton setImage:playing ? @"pauseImage.png":@"playImage.png" forState:UIControlStateNormal]; 
} 

-(void)pauseButtonClicked 
{ 
    // Handle pausing 
} 
-(void)playButtonClicked 
{ 
    // Handle starting to play 
} 

Answer 5

全球BOOL没有必要。只需设置图像为UIControlStateSelected（即播放），另一个是UIControlStateNormal（即暂停），并在你的操作方法：

-(IBAction)buttonAction:(id)sender{ 
    if ([sender isKindOfClass:[UIButton class]]) 
    { 
     UIButton *button = sender; 
     button.selected = !button.selected; 
     if (button.selected) 
      // Play 
     else //Pause 
    } 

Answer 6

Here is my code. Have a look. 

    @IBAction func playAndPauseButtonClicked(sender: AnyObject) { 
      let skView = self.view as! SKView 
      skView.scene!.paused = true 

      if (playAndPauseButton.currentImage == UIImage(named: "play.png")) 
      { 
       playAndPauseButton.setImage(UIImage(named: "pause.png"), forState: UIControlState.Normal) 
      } 
      else 
      { 
       playAndPauseButton.setImage(UIImage(named: "play.png"), forState: UIControlState.Normal) 
       skView.scene!.paused = false 
      } 

     } 

Note: I used this in a sample game where I have button which pause and play the game scene.