按下UIImageView時記錄的Touch Up外事件

Question

我有一個UIButton，我添加了一個“觸摸外部”操作。 我有一個UIImageView。

我需要以下操作：當用戶觸摸按鈕並在UIImageView處釋放時，我希望執行someAction。

如果用戶觸摸該按鈕並在UIImageView以外的其他視圖中釋放，則不應執行someAction。

這是我的代碼：

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

    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInView:[touch view]];
    NSLog(@"Touch x : %f y : %f", location.x, location.y);
    if(CGRectContainsPoint(redBtn.frame, location)){
        NSLog(@"red button pressed");
    }else if (CGRectContainsPoint(blueBtn.frame, location)){
        NSLog(@"blue button pressed");
    }
}

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

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

}

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


    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInView:[touch view]];
    if(CGRectContainsPoint(firstImageView.frame, location)){
        if(redFlag){
            [firstImageView setBackgroundColor:[UIColor redColor]];
        }
        else if(blueFlag){
            [firstImageView setBackgroundColor:[UIColor blueColor]];
        }

        NSLog(@"touch ended in first view");
    }else if(CGRectContainsPoint(secondImageView.frame, location)){

        if(redFlag){
            [secondImageView setBackgroundColor:[UIColor redColor]];
        }
        else if(blueFlag){
            [secondImageView setBackgroundColor:[UIColor blueColor]];
        }

        NSLog(@"touch ended in second view");
    }

}

Answer 1

使用touchesEnded來實現這一點。 要檢查按鈕是否按下，請使用BOOL，然后在觸摸結束時使用touch.view == imageView然后執行所需的操作。

在按鈕單擊事件上，將BOOL變量設為yes，以確保其被按下。 現在，在touchesEnded的UIResponser中編寫

UITouch *touch = [touches anyObject]; 
if (touch.view == imageView) 
   {
      // do the required thing here
   }