add tapGestureRecognizer to UIImageView in UIView and call method by protocol - ios

Question

I want to make touch recognized on an UIImageView(orange) in an UIView(blue). And hopefully, handle the touch event in a delegate method, which will be used in other classes. However, I can't make touch recognized with below code. How can I implement to recognize touch only in the ImageView(orange).
code:
import UIKit
protocol CustomViewDelegate {
func imageViewTapped()
}
class CustomView: UIView {
var delegate: CustomViewDelegate?
var imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
override init(frame: CGRect) {
super.init(frame: frame)
self.backgroundColor = UIColor.blue
self.imageView.backgroundColor = UIColor.orange
let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(self.tapped))
imageView.addGestureRecognizer(tapGestureRecognizer)
self.addSubview(imageView)
}
public required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
func tapped() {
print("tapped method called")
delegate?.imageViewTapped()
}
}
class ViewController: UIViewController, CustomViewDelegate {
override func viewDidLoad() {
super.viewDidLoad()
let view = CustomView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))
view.delegate = self
self.view.addSubview(view)
}
func imageViewTapped() {
print("come to view controller")
}
}

Answer 1

UIImageView default userinteraction is false, so enable imageView userinteraction in CustomView init.
imageView.isUserInteractionEnabled = true

Answer 2

Add Different UITapGestureRecognizer to different views and handle as per your requirement . or add tag and access like this
func tapOneAct(sender: UITapGestureRecognizer){
if let tag = sender.view?.tag {
switch tag {
case 1:
println("First View Tapped")
case 2:
println("Second View Tapped")
default:
println("Nothing Tapped")
}
}
}

Answer 3

enable isUserInteractionEnabled property on UIImageView as it defaults to false
let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(CustomView.tapped(_:)))
imageView.isUserInteractionEnabled = true
imageView.addGestureRecognizer(tapGestureRecognizer)
self.addSubview(imageView)
in tapGesture method
func tapgesture(_ sender: UITapGestureRecognizer){
if sender.state == .ended {
let touchLocation: CGPoint = sender.location(in: sender.view?.superview)
if imageView.frame.contains(touchLocation) {
print("tapped method called")
delegate?.imageViewTapped()
}
}
}