ios - touchesEnd 未被调用位 touchesBegin 和 touchesMoved 确实被调用

Question

我正在尝试在 ios 中进行拖动。如果拖动移动的距离很短，我将通过比较起始 x、y(从 touchesBegan 开始)与 touchesEnd 中的 x、y 来将拖动计为单击事件。 似乎 touchesEnd 永远不会被调用。我设置了一个断点来验证它，断点从未消失。

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

    NSUInteger touchCount = [touches count];
    NSUInteger tapCount = [[touches anyObject] tapCount];

    [ self UpdateDrag];

   }

- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    NSUInteger touchCount = [touches count];
    NSUInteger tapCount = [[touches anyObject] tapCount];

    }


- (void) touchesEnd:(NSSet *)touches withEvent:(UIEvent *)event {
   // this methes never gets called 
    NSUInteger touchCount = [touches count];
    NSUInteger tapCount = [[touches anyObject] tapCount];


    if (mDisplay==nil)
    {
        mDisplay = [[cDisplayYesOrNo_iPhone alloc]
                    initWithNibName:@"cDisplayYesOrNo_iPhone"
                    bundle:[NSBundle mainBundle]];
    }
    [ mDisplay SetUp];
    [self presentModalViewController: mDisplay animated:NO];


}

Answer 1

是 - (void)touchesEnded: 不是 - (void)touchesEnd:

https://developer.apple.com/library/ios/documentation/uikit/reference/UIResponder_Class/Reference/Reference.html#//apple_ref/occ/instm/UIResponder/touchesEnded:withEvent :