我想在两个集合视图之间实现拖放功能。为此我使用KDDragAndDropManager.swift。当我的项目与其他项目的集合视图交叉时，这工作正常。但我想拖动一个新的位置，其中单元格不与任何其他单元格相交。前几天我被困在这里。请帮助任何帮助
func updateForLongPress(recogniser : UILongPressGestureRecognizer) -> Void {
if let bundl = self.bundle {
let pointOnCanvas = recogniser.locationInView(recogniser.view)
let sourceDraggable : KDDraggable = bundl.sourceDraggableView as! KDDraggable
let pointOnSourceDraggable = recogniser.locationInView(bundl.sourceDraggableView)
switch recogniser.state {
case .Began :
self.canvas.addSubview(bundl.representationImageView)
sourceDraggable.startDraggingAtPoint?(pointOnSourceDraggable)
case .Changed :
// Update the frame of the representation image
var repImgFrame = bundl.representationImageView.frame
repImgFrame.origin = CGPointMake(pointOnCanvas.x - bundl.offset.x, pointOnCanvas.y - bundl.offset.y);
bundl.representationImageView.frame = repImgFrame
var overlappingArea : CGFloat = 0.0
var mainOverView : UIView?
for view in self.views.filter({ v -> Bool in v is KDDroppable }) {
let viewFrameOnCanvas = self.convertRectToCanvas(view.frame, fromView: view)
let intersectionNew = CGRectIntersection(bundl.representationImageView.frame, viewFrameOnCanvas).size
if (intersectionNew.width * intersectionNew.height) > overlappingArea {
overlappingArea = intersectionNew.width * intersectionNew.width
mainOverView = view
}
}
if let droppable = mainOverView as? KDDroppable {
let rect = self.canvas.convertRect(bundl.representationImageView.frame, toView: mainOverView)
if droppable.canDropAtRect(rect) {
if mainOverView != bundl.overDroppableView { // if it is the first time we are entering
(bundl.overDroppableView as! KDDroppable).didMoveOutItem(bundl.dataItem)
droppable.willMoveItem(bundl.dataItem, inRect: rect)
}
// set the view the dragged element is over
self.bundle!.overDroppableView = mainOverView
droppable.didMoveItem(bundl.dataItem, inRect: rect)
}
}
case .Ended :
if bundl.sourceDraggableView != bundl.overDroppableView { // if we are actually dropping over a new view.
print("\(bundl.overDroppableView?.tag)")
if let droppable = bundl.overDroppableView as? KDDroppable {
sourceDraggable.dragDataItem(bundl.dataItem)
let rect = self.canvas.convertRect(bundl.representationImageView.frame, toView: bundl.overDroppableView)
droppable.dropDataItem(bundl.dataItem, atRect: rect)
}
}
bundl.representationImageView.removeFromSuperview()
sourceDraggable.stopDragging?()
default:
break
}
} // if let bundl = self.bundle ...
}