ho una tableView
nel mio storyboard in cui ho aggiunto 4 celle statiche in esso e il mio sguardo storyboard come:Come trascinare una cella statica in tableView swift?
non ho alcuna dataSource per questo tableView
perché le mie cellule sono statici.
E utilizzo il codice riportato di seguito per trascinare una cella e funziona perfettamente finché non faccio scorrere un tavolo.
import UIKit
class TableViewController: UITableViewController {
var sourceIndexPath: NSIndexPath = NSIndexPath()
var snapshot: UIView = UIView()
let longPress: UILongPressGestureRecognizer = {
let recognizer = UILongPressGestureRecognizer()
return recognizer
}()
override func viewDidLoad() {
super.viewDidLoad()
longPress.addTarget(self, action: "longPressGestureRecognized:")
self.tableView.addGestureRecognizer(longPress)
self.tableView.allowsSelection = false
}
override func viewWillAppear(animated: Bool) {
self.tableView.reloadData()
}
// MARK: UIGestureRecognizer
func longPressGestureRecognized(gesture: UILongPressGestureRecognizer){
let state: UIGestureRecognizerState = gesture.state
let location:CGPoint = gesture.locationInView(self.tableView)
if let indexPath: NSIndexPath = self.tableView.indexPathForRowAtPoint(location){
switch(state){
case UIGestureRecognizerState.Began:
sourceIndexPath = indexPath
let cell: UITableViewCell = self.tableView .cellForRowAtIndexPath(indexPath)!
//take a snapshot of the selected row using helper method
snapshot = customSnapshotFromView(cell)
//add snapshot as subview, centered at cell's center
var center: CGPoint = cell.center
snapshot.center = center
snapshot.alpha = 0.0
self.tableView.addSubview(snapshot)
UIView.animateWithDuration(0.25, animations: {() -> Void in
center.y = location.y
self.snapshot.center = center
self.snapshot.transform = CGAffineTransformMakeScale(1.05, 1.05)
self.snapshot.alpha = 0.98
cell.alpha = 0.0
}, completion: { (finished) in
cell.hidden = true
})
case UIGestureRecognizerState.Changed:
let cell: UITableViewCell = self.tableView.cellForRowAtIndexPath(indexPath)!
var center: CGPoint = snapshot.center
center.y = location.y
snapshot.center = center
print("location \(location.y)")
//is destination valid and is it different form source?
if indexPath != sourceIndexPath{
//update data source
//I have commented this part because I am not using any dataSource.
// self.customArray.exchangeObjectAtIndex(indexPath.row, withObjectAtIndex: sourceIndexPath.row)
//move the row
self.tableView.moveRowAtIndexPath(sourceIndexPath, toIndexPath: indexPath)
//and update source so it is in sync with UI changes
sourceIndexPath = indexPath
}
if (location.y < 68) || (location.y > 450) {
print("cancelled")
self.snapshot.alpha = 0.0
cell.hidden = false
UIView.animateWithDuration(0.10, animations: {() -> Void in
self.snapshot.center = cell.center
self.snapshot.transform = CGAffineTransformIdentity
self.snapshot.alpha = 0.0
//undo fade out
cell.alpha = 1.0
}, completion: { (finished) in
self.snapshot.removeFromSuperview()
})
}
case UIGestureRecognizerState.Ended:
//clean up
print("ended")
let cell: UITableViewCell = tableView.cellForRowAtIndexPath(indexPath)!
cell.hidden = false
UIView.animateWithDuration(0.25, animations: {() -> Void in
self.snapshot.center = cell.center
self.snapshot.transform = CGAffineTransformIdentity
self.snapshot.alpha = 0.0
//undo fade out
cell.alpha = 1.0
}, completion: { (finished) in
self.snapshot.removeFromSuperview()
})
break
default:
break
}
}else{
gesture.cancelsTouchesInView = true
}
}
func customSnapshotFromView(inputView: UIView) -> UIView {
// Make an image from the input view.
UIGraphicsBeginImageContextWithOptions(inputView.bounds.size, false, 0)
inputView.layer.renderInContext(UIGraphicsGetCurrentContext()!)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext();
// Create an image view.
let snapshot = UIImageView(image: image)
snapshot.layer.masksToBounds = false
snapshot.layer.cornerRadius = 0.0
snapshot.layer.shadowOffset = CGSize(width: -5.0, height: 0.0)
snapshot.layer.shadowRadius = 5.0
snapshot.layer.shadowOpacity = 0.4
return snapshot
}
}
Quando ho scorrere dopo trascinandolo assomiglia:
Come si può vedere cellulare non appare di nuovo. Voglio trascinare e rilasciare la cella statica e voglio salvare la sua posizione in modo da non riorganizzare di nuovo quando faccio scorrere.
Sample progetto per ulteriori informazioni.
Questo è solo un progetto demo Ma ho aggiunto molti elementi nella mia cella e ogni cella ha un'interfaccia utente diversa.
non credo che si può avvicinare senza 'protocollo UITableViewDataSource' –