ios - touchesEnd没有被调用bit touchesBegan和touchesMoved确实被调用

我正在尝试拖拽ios。如果拖动运动距离很近，我将比较开始x，y(来自touchesBegan)与touchesEnd中的x，y，将拖动视为点击事件。
看起来touchesEnd从未被调用。我设置了一个断点进行验证，并且断点从未消失。

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];


}

最佳答案

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

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