使用两种逻辑实现
private func dragCell(cell:UITableViewCell?){
if #available(iOS 11.0, *) {
cell?.userInteractionEnabledWhileDragging = true
}else {
let pan = UILongPressGestureRecognizer(target: self, action: #selector(self.longPressGesture))
cell?.addGestureRecognizer(pan)
}
}
//MARK: iOS 11以下 拖动实现
extension CRAddTripListController{
@objc func longPressGesture(_ recognise: UILongPressGestureRecognizer) {
let currentPoint: CGPoint = recognise.location(in: tableView)
let currentIndexPath = tableView.indexPathForRow(at: currentPoint)
guard let indexPath = currentIndexPath else {
initCellImageView()
return
}
guard indexPath.row < self.routeLineModel?.count ?? 0 else {
initCellImageView()
return
}
switch recognise.state {
case .began:
longPressGestureBegan(recognise)
break
case .changed:
longPressGestureChanged(recognise)
break
default:
self.touchPoints.removeAll()
if let cell = tableView.cellForRow(at: sourceIndexPath! ){
cell.isHidden = false
}
guard let routeLine = self.routeLineModel else {return}
var tempArr:[CRPointsModel] = [CRPointsModel]()
for line in routeLine {
if line is CRPointsModel {
tempArr.append(line as! CRPointsModel)
}
}
(self.parent as? CREditTripMapViewController)?.addLine(routeLineArr: tempArr)
initCellImageView()
break
}
}
private func longPressGestureBegan(_ recognise: UILongPressGestureRecognizer) {
self.gestureRecognizer = recognise
let currentPoint: CGPoint = recognise.location(in: tableView)
let currentIndexPath = tableView.indexPathForRow(at: currentPoint)
if (currentIndexPath != nil) {
sourceIndexPath = currentIndexPath
currentCell = tableView.cellForRow(at: currentIndexPath! ) as! CRTripListCell
cellImageView = getImageView(currentCell)
cellImageView.frame = currentCell.frame
tableView.addSubview(cellImageView)
self.currentCell.isHidden = true
}
}
private func longPressGestureChanged(_ recognise: UILongPressGestureRecognizer) {
let selectedPoint: CGPoint = recognise.location(in: tableView)
var selectedIndexPath = tableView.indexPathForRow(at: selectedPoint)
if selectedIndexPath == nil || selectedIndexPath?.row == 0 {
///第一个cell 不可以移动
selectedIndexPath = IndexPath(row: 1, section: 0)
}
if tableView.numberOfSections == 1 {
self.touchPoints.append(selectedPoint)
if self.touchPoints.count > 2 {
self.touchPoints.remove(at: 0)
}
var center = cellImageView.center
center.y = selectedPoint.y
// 快照随触摸点x值改变量移动
let Ppoint = self.touchPoints.first
let Npoint = self.touchPoints.last
let moveX = Npoint!.x - Ppoint!.x
center.x += moveX
cellImageView.center = center
if ((selectedIndexPath != nil) && selectedIndexPath != sourceIndexPath) {
tableView.beginUpdates()
let cellmode = routeLineModel![sourceIndexPath!.row]
objc_sync_enter(self)
self.routeLineModel!.remove(at: sourceIndexPath!.row)
if selectedIndexPath!.row < self.routeLineModel!.count {
self.routeLineModel!.insert(cellmode, at: selectedIndexPath!.row)
}else {
self.routeLineModel!.append(cellmode)
}
self.mapDrawingLine(model: self.sortCRJourneyDetailModel(model: self.routeLineModel))
objc_sync_exit(self)
self.tableView.moveRow(at: sourceIndexPath!, to: selectedIndexPath!)
tableView.endUpdates()
sourceIndexPath = selectedIndexPath
}
}
}
private func initCellImageView() {
self.cellImageView.alpha = 0.0
self.cellImageView = UIImageView()
self.cellImageView.removeFromSuperview()
tableView.reloadData()
}
// MARK: - 截图
private func getImageView(_ cell: UITableViewCell) -> UIImageView {
UIGraphicsBeginImageContextWithOptions(cell.bounds.size, false, 0)
cell.layer.render(in: UIGraphicsGetCurrentContext()!)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
let imageView = UIImageView(image: image)
return imageView
}
}
//MARK: iOS 11 拖动实现
extension CRAddTripListController:UITableViewDragDelegate,UITableViewDropDelegate{
@available(iOS 11.0, *)
func tableView(_ tableView: UITableView, itemsForBeginning session: UIDragSession, at indexPath: IndexPath) -> [UIDragItem] {
let cellmode = self.routeLineModel![indexPath.row]
if cellmode is CRPointsModel {
let image = UIImage()
let provider = NSItemProvider(object: image)
let item = UIDragItem(itemProvider: provider)
return [item]
}else {
return []
}
}
// MARK: UITableViewDropDelegate
@available(iOS 11.0, *)
func tableView(_ tableView: UITableView, performDropWith coordinator: UITableViewDropCoordinator) {
}
@available(iOS 11.0, *)
func tableView(_ tableView: UITableView, dropSessionDidUpdate session: UIDropSession, withDestinationIndexPath destinationIndexPath: IndexPath?) -> UITableViewDropProposal {
return UITableViewDropProposal(operation: .move, intent: .insertAtDestinationIndexPath)
}
@available(iOS 11.0, *)
func tableView(_ tableView: UITableView, canHandle session: UIDropSession) -> Bool {
// Only receive image data
return session.canLoadObjects(ofClass: UIImage.self)
}
}
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