您好我在两个三个不同的collectionView之间使用KDDragAndDropCollectionView进行拖放功能。一切都很好，但我不能限制特定情况下的运动。我有三个collectionView。用户可以从A下降到B，从B下降到C.但是他不能从A到C或C从B到B或B到A。
Here is my code.
import SlideMenuControllerSwift
class MainViewController: NavigationBarViewController,KDDragAndDropCollectionViewDataSource {
@IBOutlet weak var inProgressView: UIView!
@IBOutlet weak var doneview: UIView!
@IBOutlet weak var toDoView: UIView!
@IBOutlet weak var doneCollectionView: UICollectionView!
@IBOutlet weak var inProgressCollectionView: UICollectionView!
@IBOutlet weak var toDoCollectionView: UICollectionView!
var drop: UIDropDown!
var toDoDataArray = [String]()
var inProgressDataArray = [String]()
var doneDataArray = [String]()
var dragAndDropManager : KDDragAndDropManager?
//MARK: - View Life Cycle
override func viewDidLoad() {
super.viewDidLoad()
toDoDataArray.append("A")
toDoDataArray.append("B")
toDoDataArray.append("C")
inProgressDataArray.append("D")
doneDataArray.append("B")
doneDataArray.append("C")
// Do any additional setup after loading the view.
self.setUp()
self.setupDropDown()
self.dragAndDropManager = KDDragAndDropManager(canvas: self.view, collectionViews: [toDoCollectionView, inProgressCollectionView,doneCollectionView])
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransition(to: size, with: coordinator)
}
//MARK: - Private Method
func setupDropDown() {
drop = UIDropDown(frame: CGRect(x: 24, y: 80, width: 200, height: 40))
//drop.center = CGPoint(x: self.view.frame.midX, y: self.view.frame.midY)
drop.placeholder = "Select Month"
drop.options = ["Weekly", "Monthly", "Bi-Annual", "Annual"]
drop.didSelect { (option, index) in
self.drop.placeholder = option
print("You just select: \(option) at index: \(index)")
}
self.view.addSubview(drop)
}
func setUp()
{
//Setup Navigation Bar
self.menuIconImage = #imageLiteral(resourceName: "hamIco")
self.setNavigationBarButtonItem()
self.setNavigationBarItem()
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
//MARK: - Navigation Bar Button Action Method
//MARK: - Button Action Methods
/**
Button Action method. Gets called when the left navigation item
Parameters: sender - the button on which the event occurred
**/
@IBAction func leftBtnAction(sender: UIButton) {
self.toggleLeft()
}
// MARK: - UITableView DataSource abd Delegate
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
print("Step 1 called")
if collectionView.tag == 0 {
return toDoDataArray.count
}
else if collectionView.tag == 1 {
return inProgressDataArray.count
}
return doneDataArray.count
}
// The cell that is returned must be retrieved from a call to -dequeueReusableCellWithReuseIdentifier:forIndexPath:
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
print("Step 2 called")
if collectionView.tag == 0 {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: TO_DO_COLLECTION_CELL_ID, for: indexPath) as! ToDoCollectionViewCell
cell.isHidden = false
if let kdCollectionView = collectionView as? KDDragAndDropCollectionView {
if let draggingPathOfCellBeingDragged = kdCollectionView.draggingPathOfCellBeingDragged {
if draggingPathOfCellBeingDragged.item == indexPath.item {
cell.isHidden = true
}
}
}
return cell
}
else if collectionView.tag == 1 {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: IN_PROGRESS_COLLECTION_CELL_ID, for: indexPath) as! InProgressCollectionViewCell
cell.isHidden = false
if let kdCollectionView = collectionView as? KDDragAndDropCollectionView {
if let draggingPathOfCellBeingDragged = kdCollectionView.draggingPathOfCellBeingDragged {
if draggingPathOfCellBeingDragged.item == indexPath.item {
cell.isHidden = true
}
}
}
return cell
}
else{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: DONE_COLLECTION_Cell_ID, for: indexPath) as! DoneCollectionViewCell
cell.isHidden = false
if let kdCollectionView = collectionView as? KDDragAndDropCollectionView {
if let draggingPathOfCellBeingDragged = kdCollectionView.draggingPathOfCellBeingDragged {
if draggingPathOfCellBeingDragged.item == indexPath.item {
cell.isHidden = true
}
}
}
return cell
}
}
// MARK : KDDragAndDropCollectionViewDataSource
func collectionView(_ collectionView: UICollectionView, dataItemForIndexPath indexPath: IndexPath) -> AnyObject {
print("Step 3 called")
if collectionView.tag == 0 {
return toDoDataArray[indexPath.item] as AnyObject
}
else if collectionView.tag == 1 {
return inProgressDataArray[indexPath.item] as AnyObject
}
return doneDataArray[indexPath.item] as AnyObject
//return data[collectionView.tag][indexPath.item]
}
func collectionView(_ collectionView: UICollectionView, insertDataItem dataItem : AnyObject, atIndexPath indexPath: IndexPath) -> Void {
print("Step 4 called")
if collectionView.tag == 0 {
if let di = dataItem as? String {
toDoDataArray.insert(di, at: indexPath.item)
//data[collectionView.tag].insert(di, at: indexPath.item)
}
}
else if collectionView.tag == 1 {
if let di = dataItem as? String {
inProgressDataArray.insert(di, at: indexPath.item)
//data[collectionView.tag].insert(di, at: indexPath.item)
}
}
else{
if let di = dataItem as? String {
doneDataArray.insert(di, at: indexPath.item)
}
}
}
func collectionView(_ collectionView: UICollectionView, deleteDataItemAtIndexPath indexPath : IndexPath) -> Void {
print("Step 5 called")
if collectionView.tag == 0 {
toDoDataArray.remove(at: indexPath.item)
}
else if collectionView.tag == 1 {
inProgressDataArray.remove(at: indexPath.item)
}
else{
doneDataArray.remove(at: indexPath.item)
}
}
func collectionView(_ collectionView: UICollectionView, moveDataItemFromIndexPath from: IndexPath, toIndexPath to : IndexPath) -> Void {
print("Step 6 called")
if collectionView.tag == 0 {
let fromDataItem: String = toDoDataArray[from.item]
toDoDataArray.remove(at: from.item)
toDoDataArray.insert(fromDataItem, at: to.item)
}
else if collectionView.tag == 1 {
let fromDataItem: String = inProgressDataArray[from.item]
inProgressDataArray.remove(at: from.item)
inProgressDataArray.insert(fromDataItem, at: to.item)
}
else{
let fromDataItem: String = doneDataArray[from.item]
doneDataArray.remove(at: from.item)
doneDataArray.insert(fromDataItem, at: to.item)
}
}
func collectionView(_ collectionView: UICollectionView, indexPathForDataItem dataItem: AnyObject) -> IndexPath? {
print("Step 7 called")
if collectionView.tag == 0 {
if let candidate : String = dataItem as? String {
for item : String in toDoDataArray {
if candidate == item {
let position = toDoDataArray.index(of: item)! // ! if we are inside the condition we are guaranteed a position
let indexPath = IndexPath(item: position, section: 0)
return indexPath
}
}
}
}
else if collectionView.tag == 1 {
if let candidate : String = dataItem as? String {
for item : String in inProgressDataArray {
if candidate == item {
let position = inProgressDataArray.index(of: item)! // ! if we are inside the condition we are guaranteed a position
let indexPath = IndexPath(item: position, section: 0)
return indexPath
}
}
}
}
else{
if let candidate : String = dataItem as? String {
for item : String in doneDataArray {
if candidate == item {
let position = doneDataArray.index(of: item)! // ! if we are inside the condition we are guaranteed a position
let indexPath = IndexPath(item: position, section: 0)
return indexPath
}
}
}
}
return nil
}
}
//MARK: - Extension written for Slide the Menu
extension MainViewController : SlideMenuControllerDelegate {
func leftWillOpen() {
print("SlideMenuControllerDelegate: leftWillOpen")
}
func leftDidOpen() {
print("SlideMenuControllerDelegate: leftDidOpen")
}
func leftWillClose() {
print("SlideMenuControllerDelegate: leftWillClose")
}
func leftDidClose() {
print("SlideMenuControllerDelegate: leftDidClose")
}
func rightWillOpen() {
print("SlideMenuControllerDelegate: rightWillOpen")
}
func rightDidOpen() {
print("SlideMenuControllerDelegate: rightDidOpen")
}
func rightWillClose() {
print("SlideMenuControllerDelegate: rightWillClose")
}
func rightDidClose() {
print("SlideMenuControllerDelegate: rightDidClose")
}
}