如何使用UISwipeGestureRecognizer检测UITableViewCell中的滑动事件

我有一个UITableViewCell类，我想检测滑动事件（删除），以便隐藏drawRect绘制的一些graphics

首先，我给这个单元添加了一个UISwipeGestureRecognice ：

 // Init swipe gesture recognizer self.swipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeCell:)]; self.swipeRecognizer.direction = UISwipeGestureRecognizerDirectionLeft | UISwipeGestureRecognizerDirectionRight; self.swipeRecognizer.delegate = self; [self.contentView addGestureRecognizer:self.swipeRecognizer]; 

比我实施了一个方法来对滑动事件作出反应：

 - (void)swipeCell:(UISwipeGestureRecognizer *)recognizer { switch (recognizer.state) { case UIGestureRecognizerStateBegan: self.swipeStartPoint = [recognizer locationInView:self.backgroundView]; BaseLogDebug(INFO, @"Swipe Began at %@", NSStringFromCGPoint(self.swipeStartPoint)); break; case UIGestureRecognizerStateChanged: { CGPoint currentPoint = [recognizer locationInView:self.backgroundView]; CGFloat deltaX = currentPoint.x - self.swipeStartPoint.x; BaseLogDebug(INFO, @"Swipe Moved %f", deltaX); } break; case UIGestureRecognizerStateEnded: BaseLogDebug(INFO, @"Swipe Ended"); break; case UIGestureRecognizerStateCancelled: BaseLogDebug(INFO, @"Swipe Cancelled"); break; default: break; } } 

为了允许同时使用手势识别器，我实现了以下方法：

 -(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer { return YES; } 

手势识别的唯一状态是状态UIGestureRecognizerStateEnded 。 我的代码有什么问题？

Answer 1

从UIGestureRecognizer类参考文档 ：

离散手势识别器从UIGestureRecognizerStatePossible转换到UIGestureRecognizerStateFailed或UIGestureRecognizerStateRecognized。

和

手势识别器识别一个离散的事件，如点击或滑动，但不报告手势内的变化。 换句话说，离散手势不会通过“开始”和“已更改”状态进行转换，它们也不会失败或被取消。

UISwipeGestureRecognizer是一个离散的手势。 如果你想要一个连续的（但相似的）手势，请改用UIPanGestureRecognizer 。