(Swift) Deleting UITableViewCell by dragging it out of the UITableView? - ios

Question

I currently have a UITableView with items from an array in it. It's possible to move the position of the UITableViewCell with anUILongPressGestureRecognizer freely around the Y and X axis, however I want to be able to delete the dragged UITableViewCell if it's moved outside of the UITableView.
I'm mostly aware I'll be using a Switch CaseUIGestureRecognizer.Ended to perform this but I'm currently at a loss on how to deal with it.
Here's the code:
func longPressGestureRecognized(gestureRecognizer: UIGestureRecognizer) {
let longPress = gestureRecognizer as! UILongPressGestureRecognizer
let state = longPress.state
var locationInView = longPress.locationInView(tblTasks)
var indexPath = tblTasks.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 = tblTasks.cellForRowAtIndexPath(indexPath!) as UITableViewCell!
My.cellSnapshot = snapshotOfCell(cell)
var center = cell.center
My.cellSnapshot!.center = center
My.cellSnapshot!.alpha = 0.0
tblTasks.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
}
}) // End of animation sequence
} // End of IF statement
case UIGestureRecognizerState.Changed:
var center = My.cellSnapshot!.center
center.x = locationInView.x
center.y = locationInView.y
My.cellSnapshot!.center = center
if (indexPath != nil) && (indexPath != Path.initialIndexPath) {
swap(&taskMgr.tasks[indexPath!.row], &taskMgr.tasks[Path.initialIndexPath!.row])
tblTasks.moveRowAtIndexPath(Path.initialIndexPath!, toIndexPath: indexPath!)
Path.initialIndexPath = indexPath
}
default:
let cell = tblTasks.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
}
})
} // End of switch
} // End of longPressGestureRecognized func
Any ideas?

Answer 1

You're on the right track but you need to embed your table view controller in the container of another view controller, and then put the gesture recognizer code in the container view controller.
This will help a lot: http://www.freshconsulting.com/create-drag-and-drop-uitableview-swift/
It's not 100% right but pretty close and I was able to use it to get exactly this going.