如何創建雙功能按鈕？

Question

我有一個應用程序有一個開始按鈕（與播放圖像）。一旦開始按鈕被點擊，下一次點擊應該像一個暫停按鈕（也是按鈕圖像的改變）。我們怎樣才能實現這個功能與圖像改變一個用於播放和另一個用相同的按鈕暫停？

Answer 1

- (IBAction)buttonClicked:(id)sender 
{ 

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

Answer 2

試試這個

-(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]; 
} 
} 

所有最優秀的。

Answer 3

我會在點擊方法中有一個布爾值，如果它已經播放或不播放，它將保持跟蹤。如果不是正在播放，請將其啓動並將圖像設置爲暫停圖像，如果正在播放，則再次按下該按鈕即可執行所需操作，即暫停和更改圖像。

這個循環會在點擊方法：

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

這是怎麼我會處理這件事

在你的viewController定義中定義布爾

BOOL playing; 

然後在按鈕您應該採取類似行動

-(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沒有必要。只需設置圖像爲UIControlStateSelected（即播放），另一個是UIControlStateNormal（即暫停），並在你的操作方法：

-(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.