tableView上的UIPanGestureRecognizer不会滚动表项

3 回答

• 1

  如果我正确理解它，那么你想在滚动时取消PanGesture .

  试试这个 ：

  func isItemAvailabe(gesture: UISwipeGestureRecognizer) -> Bool {
      if gesture.direction == .down {
          // check if we have some values in down if yes return true else false
      } else if gesture.direction == .up {
          // check if we have some values in up if yes return true else false
      }
      return false
  }
  
  func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer,
                         shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
      if gestureRecognizer == self.panGesture && otherGestureRecognizer == self.scrollGesture && isItemAvailabe(gesture: otherGestureRecognizer) {
          return true
      }
      return false
  }
  

  如果这可以解决您的问题，或者我没有正确理解，请告诉我 .

  还要记得添加它：

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

  你可以查看更多here

  回复于 2024-04-29T12:54:59+08:00
• 1

  使用tableView自己的panGestureRecognizer（不添加新的gestureRecognizer）的最佳方法，如：

  tableView.panGestureRecognizer.addTarget(self, action: #selector(self.tableViewDragged(gestureRecognizer:))
  

  行动

  @objc func tableViewDragged(gestureRecognizer: UIPanGestureRecognizer) {
      guard tableView.contentOffset.y < 0 else { return }
      if gestureRecognizer.state == UIGestureRecognizerState.began || gestureRecognizer.state == UIGestureRecognizerState.changed {
  
      let translation = gestureRecognizer.translation(in: self.view)
  
      // if origin moved to map origin it should not scroll above but cell should scroll normally. But returning does not help scrolling cells
      if self.tableView.frame.origin == self.mapContainer.frame.origin && translation.y < 0 {
  
          return
      }
  
      var frame = self.tableView.frame
      let nHeight = (frame.origin.y + translation.y)
  
      if (nHeight < self.view.frame.size.height) {
  
          frame.origin.y = nHeight
          self.tableView.frame = frame
          gestureRecognizer.setTranslation(CGPoint(x: 0, y: 0), in: self.view)
      }
  }
  }
  

  回复于 2024-04-29T12:54:59+08:00
• 1

  我不知道一个比子类化tableView更好的解决方案，并在 layoutSubviews 中阻止它 contentOffset . 就像是 ：

  class MyTableView: UITableView {
      var blocksOffsetAtZero = false
      override func layoutSubviews() {
          super.layoutSubviews()
          guard blocksOffsetAtZero else { return }
          contentOffset = .zero
      }
  }
  

  我认为这是 Map 应用中使用的解决方案 . 当用户在主屏幕上拖动tableView时，它不会滚动但会提升直到它到达屏幕顶部然后再次滚动 .

  为此，您可以向tableview添加一个手势，该手势同时识别tableView的识别器，并在每次识别器移动tableView的帧时阻止tableView的 contentOffset .

  UPDATE https://github.com/gaetanzanella/mapLike

  你是否正确实现了委托？

  // MARK: - UIGestureRecognizerDelegate
  
  func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer,
                         shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
      return true
  }
  

  尝试以下方法：

  @objc func tableViewDragged(gestureRecognizer: UIPanGestureRecognizer) {
  
      if gestureRecognizer.state == UIGestureRecognizerState.began || gestureRecognizer.state == UIGestureRecognizerState.changed {
  
          let translation = gestureRecognizer.translation(in: self.view)
  
          var frame = self.tableView.frame
          let nHeight = (frame.origin.y + translation.y)
  
          if (nHeight < self.view.frame.size.height) {
              frame.origin.y = nHeight
              self.tableView.frame = frame
              gestureRecognizer.setTranslation(CGPoint(x: 0, y: 0), in: self.view)
              tableView.blocksOffsetAtZero = true
          } else {
              tableView.blocksOffsetAtZero = false
          }
      }
  }
  

  主要思想：当你改变框架时，阻止滚动 .

  您也可以使用kamaldeep singh bhatia提供的委托技术，但是您将无法移动第一个tableView然后在单个手势中滚动 .

  查看示例here

  回复于 2024-04-29T12:54:59+08:00