如何使用多點觸控正確顯示兩張圖像的高光？

我有自定義雙滑塊的問題。有兩個圖像是拇指。應用程序工作正常，兩個拇指可以用兩個手指移動，但突出顯示有問題。如何使用多點觸控正確顯示兩張圖像的高光？

當我從一個拇指脫下手指時，從第二個拇指突出顯示也恢復正常。當我使用任何if和else陳述時，它會帶來另一個不好的結果：有時在手指從圖像移出時突出顯示不變或保持不變。或眨眼。

我不知道，如何繼續工作，綁定高亮與endTouches事件正常。如果沒有按下，則不要突出顯示拇指。如何解決？

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { 

    for(UITouch *touch in [event allTouches]) { 

     CGPoint touchPoint = [touch locationInView:self]; 
     if(CGRectContainsPoint(thumbLeft.frame, touchPoint)){ 
      thumbLeft.highlighted = YES; 
     } 
     if(CGRectContainsPoint(thumbRight.frame, touchPoint)){ 
      thumbRight.highlighted = YES; 
     } 

    } 
} 
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { 

    //No idea here 
    for(UITouch *touch in [event allTouches]) { 
     CGPoint touchPoint = [touch locationInView:self]; 


     //----------- ???? ----------// 

     thumbRight.highlighted = NO; 
     thumbLeft.highlighted = NO; 

    } 
} 

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ 

    for(UITouch *touch in [event allTouches]) { 

     CGPoint touchPoint = [touch locationInView:self]; 
     if (CGRectContainsPoint(thumbLeft.frame, touchPoint)){ 
      thumbLeft.center = CGPointMake(MAX(barLeftHorizontalPosition, MIN(touchPoint.x, thumbRight.center.x - minimumRange)), thumbLeft.center.y); 
      thumbLeft.highlighted = YES; 
      valueLeft = [self valueGetX:thumbLeft.center.x]; 
     } 

     if (CGRectContainsPoint(thumbRight.frame, touchPoint)){ 
      thumbRight.center = CGPointMake(MAX(thumbLeft.center.x + minimumRange, MIN(touchPoint.x, barRightHorizontalPosition)), thumbRight.center.y); 
      thumbRight.highlighted = YES; 
      valueRight = [self valueGetX:thumbRight.center.x]; 
     } 

     [self sendActionsForControlEvents:UIControlEventValueChanged]; 
    } 
}

來源

2015-05-18 user3545373

我認爲這個問題是不是在touchesEnded，但touchesMoved方法。

你應該實現邏輯回touchesEnded：

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { 
    for(UITouch *touch in [event allTouches]) { 
     CGPoint touchPoint = [touch locationInView:self]; 
     if(CGRectContainsPoint(thumbLeft.frame, touchPoint)){ 
      thumbLeft.highlighted = NO; 
     } 
     if(CGRectContainsPoint(thumbRight.frame, touchPoint)){ 
      thumbRight.highlighted = NO; 
     } 
    } 
}

，也使touchesMoved手柄上高亮設置NO：

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ 
    for(UITouch *touch in [event allTouches]) { 
     CGPoint touchPoint = [touch locationInView:self]; 

     if (CGRectContainsPoint(thumbLeft.frame, touchPoint)){ 
      thumbLeft.center = CGPointMake(MAX(barLeftHorizontalPosition, MIN(touchPoint.x, thumbRight.center.x - minimumRange)), thumbLeft.center.y); 
      thumbLeft.highlighted = YES; 
      valueLeft = [self valueGetX:thumbLeft.center.x]; 
     } else { 
      thumbLeft.highlighted = NO; 
     } 

     if (CGRectContainsPoint(thumbRight.frame, touchPoint)){ 
      thumbRight.center = CGPointMake(MAX(thumbLeft.center.x + minimumRange, MIN(touchPoint.x, barRightHorizontalPosition)), thumbRight.center.y); 
      thumbRight.highlighted = YES; 
      valueRight = [self valueGetX:thumbRight.center.x]; 
     } else { 
      thumbRight.highlighted = NO; 
     } 

     [self sendActionsForControlEvents:UIControlEventValueChanged]; 
    } 
}

來源

2015-05-18 20:35:02 Erakk

如何使用多點觸控正確顯示兩張圖像的高光？

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