Question

实现UICollection的重新排列功能的常规方法是执行以下操作：

内部，比方说，viewDidLoad：

    let longPress = UILongPressGestureRecognizer(target: self, action: #selector(self.handleLongPress(gesture:)))
    longPress.minimumPressDuration = 0.2
    self.collectionView.addGestureRecognizer(longPress)

然后是handleLongPress函数：

func handleLongPress(gesture: UILongPressGestureRecognizer){
    switch(gesture.state){
    case .began:
        guard let selected = self.collectionView.indexPathForItem(at: gesture.location(in: self.collectionView)) else{
            break
        }
        self.collectionView.beginInteractiveMovementForItem(at: selected)
    case .changed:
        self.collectionView.updateInteractiveMovementTargetPosition(gesture.location(in: gesture.view!))
    case .ended:
        self.collectionView.endInteractiveMovement()
    default:
        self.collectionView.cancelInteractiveMovement()
    }
}

并实施

func collectionView(_ collectionView: UICollectionView, canMoveItemAt indexPath: IndexPath) -> Bool { ... }

func collectionView(_ collectionView: UICollectionView, moveItemAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) { ... }

这使得我可以长时间按下单元格的任何位置。然而，当我长按最右边或最左边时，细胞集中在我触摸的位置。我可以禁用居中功能吗？

Answer 1

    case .changed:
        var location:CGPoint = gesture.location(in: gesture.view!)
        location.x = self.collectionView.frame.midX
        self.collectionView.updateInteractiveMovementTargetPosition(location)

我最终需要

UICollectionView重新排列，水平位移

1 个答案: