How to reveal hidden text by sliding UITableViewCell - ios

Question

I'm trying to place a date field to the left of a cell in UITableView that is revealed when the user slides the cell from left to right. When released, the cell should spring back into place, hiding the date field. Does anyone know how to do this? Is it handled in
func tableView(_ tableView: UITableView, editActionsForRowAt: IndexPath) -> [UITableViewRowAction]? {
or defined somehow within a custom cell?

Answer 1

I wouldnt use the editing delegate as you posted.
Put the cells content in a UIView, in a UIScrollView, then setup the information behind the UIScrollView you wish to reveal.
Then on the scroll delegate, scrollViewDidEndDragging, set the contentOffset back to 0 animated.
EDIT: Pan gesture example
If you wish for the simplest route, setup your cell with a customContentView that is the size of your cell, add the pan gesture to this, then setup and buttons you want, in my example below I had a button each side.
Note: This is swift 2, but should be easily translatable, I made this a longgg time ago when swift 2 was released, it could do with refactoring
var savedX = 0 as CGFloat
var buttonWidth = 60 as CGFloat
var open = false
func panGestureHandler(gesture: UIPanGestureRecognizer) {
if gesture.state == .Changed {
let translation = gesture.translationInView(tagView)
let difference = -translation.x
if difference > 0 && !allowScrollRight {
return
}
let newConstant = savedX + difference
tagViewCenterXConstraint.constant = newConstant
let alpha = abs(tagViewCenterXConstraint.constant) / buttonWidth
deleteButton.alpha = min(alpha, 1)
followButton.alpha = min(alpha, 1)
if let action = swipe {
action(self)
}
}
if gesture.state == .Ended {
let translation = gesture.translationInView(self)
let trans = fabs(translation.x)
open = !open && trans > buttonWidth
if open {
if(translation.x > 0){
resetRight(true)
} else {
if allowScrollRight {
resetLeft(true)
}
}
} else {
resetView(true){
}
}
}
}
func resetLeft (animated : Bool) {
tagViewCenterXConstraint.constant = self.buttonWidth
savedX = self.buttonWidth
if animated {
UIView.animateWithDuration(0.5, delay: 0, usingSpringWithDamping: 0.7, initialSpringVelocity: 0.7, options: [UIViewAnimationOptions.CurveEaseIn, UIViewAnimationOptions.BeginFromCurrentState], animations: { () -> Void in
self.tagView.layoutIfNeeded()
self.leftView.layoutIfNeeded()
self.rightView.layoutIfNeeded()
}, completion: { (finished) -> Void in
})
}
}
func resetRight (animated : Bool) {
tagViewCenterXConstraint.constant = -self.buttonWidth
savedX = -self.buttonWidth
if animated {
UIView.animateWithDuration(0.5, delay: 0, usingSpringWithDamping: 0.7, initialSpringVelocity: 0.7, options: [UIViewAnimationOptions.CurveEaseIn, UIViewAnimationOptions.BeginFromCurrentState], animations: { () -> Void in
self.tagView.layoutIfNeeded()
self.leftView.layoutIfNeeded()
self.rightView.layoutIfNeeded()
}, completion: { (finished) -> Void in
})
}
}
func resetView (animated : Bool, completion: () -> Void ) {
tagViewCenterXConstraint.constant = 0
savedX = 0
open = false
if animated {
UIView.animateWithDuration(0.5, delay: 0, usingSpringWithDamping: 0.7, initialSpringVelocity: 0.7, options: [UIViewAnimationOptions.CurveEaseIn, UIViewAnimationOptions.BeginFromCurrentState], animations: { () -> Void in
self.tagView.layoutIfNeeded()
self.leftView.layoutIfNeeded()
self.rightView.layoutIfNeeded()
}, completion: { (finished) -> Void in
completion()
})
} else {
completion()
}
}