1
我一直在試圖建立阻力和使用本指南http://www.freshconsulting.com/create-drag-and-drop-uitableview-swift/嘗試創建拖放到tableview。 SWIFT
這是我的viewDidLoad代碼
let longpress = UILongPressGestureRecognizer(target: self, action: "longPressGestureRecognized:")
longpress.minimumPressDuration = 1.0
table.addGestureRecognizer(longpress)
而且FUNC
func longPressGestureRecognized(gestureRecognizer: UILongPressGestureRecognizer) {
func snapshopOfCell(inputView: UIView) -> UIView {
UIGraphicsBeginImageContextWithOptions(inputView.bounds.size, false, 0.0)
inputView.layer.renderInContext(UIGraphicsGetCurrentContext())
let image = UIGraphicsGetImageFromCurrentImageContext() as UIImage
UIGraphicsEndImageContext()
let cellSnapshot : UIView = UIImageView(image: image)
cellSnapshot.layer.masksToBounds = false
cellSnapshot.layer.cornerRadius = 0.0
cellSnapshot.layer.shadowOffset = CGSizeMake(-5.0, 0.0)
cellSnapshot.layer.shadowRadius = 5.0
cellSnapshot.layer.shadowOpacity = 0.4
return cellSnapshot
}
let longPress = gestureRecognizer as UILongPressGestureRecognizer
let state = longPress.state
var locationInView = longPress.locationInView(table)
var indexPath = table.indexPathForRowAtPoint(locationInView)
struct My {
static var cellSnapshot : UIView? = nil
}
struct Path {
static var initialIndexPath : NSIndexPath? = nil
}
switch state {
case UIGestureRecognizerState.Began:
if indexPath != nil {
Path.initialIndexPath = indexPath
let cell = table.cellForRowAtIndexPath(indexPath!) as UITableViewCell!
My.cellSnapshot = snapshopOfCell(cell)
var center = cell.center
My.cellSnapshot!.center = center
My.cellSnapshot!.alpha = 0.0
table.addSubview(My.cellSnapshot!)
UIView.animateWithDuration(0.25, animations: {() -> Void in
center.y = locationInView.y
My.cellSnapshot!.center = center
My.cellSnapshot!.transform = CGAffineTransformMakeScale(1.05, 1.05)
My.cellSnapshot!.alpha = 0.98
cell.alpha = 0.0
}, completion: { (finished) -> Void in
if finished {
cell.hidden = true
}
})
}
case UIGestureRecognizerState.Changed:
var center = My.cellSnapshot!.center
center.y = locationInView.y
My.cellSnapshot!.center = center
if ((indexPath != nil) && (indexPath != Path.initialIndexPath)) {
swap(&cellContent[indexPath!.row], &cellContent[Path.initialIndexPath!.row])
table.moveRowAtIndexPath(Path.initialIndexPath!, toIndexPath: indexPath!)
Path.initialIndexPath = indexPath
}
default:
let cell = table.cellForRowAtIndexPath(Path.initialIndexPath!) as UITableViewCell!
cell.hidden = false
cell.alpha = 0.0
UIView.animateWithDuration(0.25, animations: {() -> Void in
My.cellSnapshot!.center = cell.center
My.cellSnapshot!.transform = CGAffineTransformIdentity
My.cellSnapshot!.alpha = 0.0
cell.alpha = 1.0
}, completion: { (finished) -> Void in
if finished {
Path.initialIndexPath = nil
My.cellSnapshot!.removeFromSuperview()
My.cellSnapshot = nil
}
})
}
}
的問題是，它崩潰下降當長按一個單元格時。
錯誤代碼：longPressGestureRecognized：]：無法識別的選擇發送到實例0x79a3b110'
其他一切工作正常，如刪除單元格內容等
提前感謝！