UIScrollView 不响应(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate

• UIScrollView 的drag事件

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
         dosomething(); //copy from scrollViewDidEndDragging
    }

-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
        if (NO == decelerate) {
                dosometing();
        }
}