获得手势所在的图片坐标 & CGRectContainsPoint

- (void)longAction:(UILongPressGestureRecognizer *)recognizer

{

   UIImageView *imageView = (UIImageView *)recognizer.view;

    if (recognizer.state ==UIGestureRecognizerStateBegan) {//长按开始

//       startPoint = [recognizer locationInView:recognizer.view]; //1

       startPoint = imageView.frame.origin;  //2

}

2.CGRectContainsPoint 看参数说明，一个点是否包含在矩形中，所以参数为一个点一个矩形 

  e.g. :CGRectContainsPoint(otherImageView.frame, point))