Unable To Add Gesture on Dynamically Added UILabel - ios

Question

I am trying to add gesture on a dynamically created label but its not working this the code but its not working.
what am i doing wrong ?
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 21))
label.center = CGPoint(x: 160, y: 285)
label.textAlignment = .center
label.text = field.text
label.isZoomEnabled = true;
label.minFontSize = 10;
label.maxFontSize = 80;
label.adjustsFontSizeToFitWidth = true;
label.setNeedsLayout()
label.isUserInteractionEnabled = true
let panRecognizer = UITapGestureRecognizer(target: self, action:Selector(("handlePan:")))
let rotateRecognizer = UITapGestureRecognizer(target: self, action:Selector(("handleRotate:")))
panRecognizer.delegate = self
rotateRecognizer.delegate = self
label.addGestureRecognizer(panRecognizer)
label.addGestureRecognizer(rotateRecognizer)
self.view.addSubview(label);
self.imagePicked.addSubview(label)
#IBAction func handlePan(recognizer:UIPanGestureRecognizer) {
let translation = recognizer.translation(in: self.view)
if let view = recognizer.view {
view.center = CGPoint(x:view.center.x + translation.x,
y:view.center.y + translation.y)
}
recognizer.setTranslation(CGPoint(x:0,y:0), in: self.view)
}
#IBAction func handleRotate(recognizer : UIRotationGestureRecognizer) {
if let view = recognizer.view {
view.transform = view.transform.rotated(by: recognizer.rotation)
recognizer.rotation = 0
}
}
Thanks In Advance.

Answer 1

You are creating UITapGestureRecognizer but the methods were taking UIPanGestureRecognizer and UIRotationGestureRecognizer. Also changed the selector so the methods are called properly and changed IBActions to methods.
Replace your code with this and it will work fine,
let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 21))
label.center = CGPoint(x: 160, y: 285)
label.textAlignment = .center
label.text = field.text
label.isZoomEnabled = true;
label.minFontSize = 10;
label.maxFontSize = 80;
label.adjustsFontSizeToFitWidth = true;
label.setNeedsLayout()
label.isUserInteractionEnabled = true
let panRecognizer = UIPanGestureRecognizer(target: self, action:#selector(self.handlePan))
let rotateRecognizer = UIRotationGestureRecognizer(target: self, action:#selector(self.handleRotate))
panRecognizer.delegate = self
rotateRecognizer.delegate = self
label.addGestureRecognizer(panRecognizer)
label.addGestureRecognizer(rotateRecognizer)
self.view.addSubview(label);
self.imagePicked.addSubview(label)
func handlePan(recognizer:UIPanGestureRecognizer) {
let translation = recognizer.translation(in: self.view)
if let view = recognizer.view {
view.center = CGPoint(x:view.center.x + translation.x,
y:view.center.y + translation.y)
}
recognizer.setTranslation(CGPoint(x:0,y:0), in: self.view)
}
func handleRotate(recognizer : UIRotationGestureRecognizer) {
if let view = recognizer.view {
view.transform = view.transform.rotated(by: recognizer.rotation)
recognizer.rotation = 0
}
}

Answer 2

It's the problem of UIlabel's superView.
I assume the imagePicked is an instance of UIImageView, and the default value of UIImageView's isUserInteractionEnabled is flase.
So the imagePicked and all of it's subviews cannot receive touch events.
To fix this problem, enbale the isUserInteractionEnabled property of UIImageView:
self.imagePicked.isUserInteractionEnabled = true;