我正在拖动来自 UICollectionVIew 的贴纸图片，并将其放在位于 UICollectionView 上方的 UIimageView 上。用户可以在 UIImageView 中移动任何贴纸图像。当我在 UIImageVIew 中选择贴纸图片时，它总是选择我丢弃的最后贴纸。我知道有一些对象不匹配......任何帮助 这是我的代码
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! CollectionViewCell
cell.imgViewColl.tag = indexPath.row
if(indexPath.row == 1){
cell.imgViewColl.image = UIImage(named: "applause.png")
}
else if(indexPath.row == 2){
cell.imgViewColl.image = UIImage(named: "baby.png")
}
else if(indexPath.row == 3){
cell.imgViewColl.image = UIImage(named: "basketball.png")
}
let panGesture = UIPanGestureRecognizer(target: self, action:#selector(ViewController.handlePan(_:)))
panGesture.delegate = self
longGesture.minimumPressDuration = 0.01
cell.addGestureRecognizer(panGesture)
return cell // Create UICollectionViewCell
}
func handlePan(recognizer:UIPanGestureRecognizer) {
let locationPoint = recognizer.locationInView(self.colleView)
if recognizer.state == UIGestureRecognizerState.Began {
if self.colleView.indexPathForItemAtPoint(locationPoint) != nil {
let indexPathOfMovingCell = self.colleView.indexPathForItemAtPoint(locationPoint)
let cell = self.colleView.cellForItemAtIndexPath(indexPathOfMovingCell!)
UIGraphicsBeginImageContext(cell!.bounds.size)
cell!.layer.renderInContext(UIGraphicsGetCurrentContext()!)
let cellImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
movingCell = UIImageView(image: cellImage)
movingCell!.center = recognizer.locationInView(imgView)
movingCell!.alpha = 1.0
movingCell?.tag = (cell?.tag)!
movingCell!.userInteractionEnabled = true
movingCell!.multipleTouchEnabled = true
movingCell!.bringSubviewToFront(imgView)
movingCell!.backgroundColor = UIColor.clearColor()
imgView.addSubview(movingCell!)
}
}
if recognizer.state == UIGestureRecognizerState.Changed
{
if recognizer.state == UIGestureRecognizerState.Changed {
movingCell!.center = recognizer.locationInView(imgView)
}
}
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
// When a touch starts, get the current location in the view
let touch = event?.allTouches()?.first
currentPoint = touch?.locationInView(movingCell!)
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
// Get active location upon move
let touch = touches.first
let activePoint = touch?.locationInView(movingCell!)
//movingCell!.center = touchLocation!
// Determine new point based on where the touch is now located
var newPoint = CGPoint(x: movingCell!.center.x + (activePoint!.x - currentPoint!.x), y: movingCell!.center.y + (activePoint!.y - currentPoint!.y))
//--------------------------------------------------------
// Make sure we stay within the bounds of the parent view
//--------------------------------------------------------
let midPointX: CGFloat = CGRectGetMidX(movingCell!.bounds)
// If too far right...
if newPoint.x > movingCell!.superview!.bounds.size.width - midPointX {
newPoint.x = self.movingCell!.bounds.size.width - midPointX
}
else if newPoint.x < midPointX {
// If too far left...
newPoint.x = midPointX
}
let midPointY: CGFloat = CGRectGetMidY(movingCell!.bounds)
// If too far down...
if newPoint.y > movingCell!.superview!.bounds.size.height - midPointY {
newPoint.y = movingCell!.superview!.bounds.size.height - midPointY
}
else if newPoint.y < midPointY {
// If too far up...
newPoint.y = midPointY
}
// Set new center location
movingCell!.center = newPoint
}