UITapGestureRecognizer does not work in view which belong to another controller - ios

Question

#IBAction func popView(_ sender: UIButton) {
let popView = PopView()
popView.setVisible()
popView.animateView(view: popView.contentView)
}
popView is a viewcontroller which has some views in it,popView use setup() in its init() to set these views.
func setup(){
view.frame = UIScreen.main.bounds
baseView.frame = view.frame
baseView.backgroundColor = UIColor.black
//baseView.alpha = appearence.backgroundAlpha
view.addSubview(baseView)
contentView.backgroundColor = UIColor.white
contentView.layer.cornerRadius = appearence.cornerRadius
contentView.frame = CGRect(x: 10, y: 10, width: appearence.width, height: appearence.height)
contentView.layer.masksToBounds = true
contentView.center = CGPoint(x: self.view.bounds.midX , y: self.view.bounds.midY )
baseView.addSubview(contentView)
headView.frame = CGRect(x: 0, y: 0, width: contentView.bounds.width, height: contentView.bounds.height / 2)
headView.backgroundColor = UIColorFromRGB(0xE64D4D)
contentView.addSubview(headView)
headImageView.image = UIImage(named: headImage)
headImageView.contentMode = .center
headImageView.frame.size = headImageView.image!.size
headImageView.center = CGPoint(x: headView.bounds.midX, y: headView.bounds.midY)
headView.addSubview(headImageView)
let recognizer = UITapGestureRecognizer(target: self, action: #selector(self.hide(_: )))
recognizer.numberOfTapsRequired = 1
contentView.addGestureRecognizer(recognizer)
print(String(describing: contentView.gestureRecognizers))
}
contentView has a tapgesturerecognizer but when I tap it doesn't work
func hide(_ recognizer: UITapGestureRecognizer){
self.view.removeFromSuperview()
}
popView is created by the code below in ViewController class
#IBAction func popView(_ sender: UIButton) {
let popView = PopView()
popView.setVisible()
popView.animateView(view: popView.contentView)
}
func setVisible(){
let rootView = UIApplication.shared.keyWindow! as UIWindow
rootView.addSubview(self.view)
}
func animateView(view: UIView){
view.center = CGPoint(x: self.view.bounds.midX, y: self.view.bounds.minY - view.bounds.midY)
UIView.animate(withDuration: 0.2, animations: {
view.center = CGPoint(x: self.view.bounds.midX , y: self.view.bounds.midY + 50)
}, completion: {(finished) -> Void in
UIView.animate(withDuration: 0.1, animations: {
view.center = CGPoint(x: self.view.bounds.midX , y: self.view.bounds.midY )
})
})
}
the popView appears correctly but contentView doesn't respond to the tap gesture. why??please help me~

Answer 1

Add tap gesture on popView's view controller instead of contentview. It will work as below.
let recognizer = UITapGestureRecognizer(target: self, action: #selector(self.hide(_: )))
recognizer.numberOfTapsRequired = 1
popView.view.addGestureRecognizer(recognizer)
print(String(describing: popView.view.gestureRecognizers))
Also move your hide function into button action class. Do Hide and showing into that class itself as below.
func hide(_ recognizer: UITapGestureRecognizer){
self.popView.view.removeFromSuperview()
let rootView = UIApplication.shared.keyWindow! as UIWindow
rootView.addSubview(self.view)
}
I hope this will help.
Below are my PopView class code:
import UIKit
class PopView: UIViewController {
var baseView: UIView = UIView()
var contentView: UIView = UIView()
var headView: UIView = UIView()
var headImageView: UIImageView = UIImageView()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.setup()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func setup(){
view.frame = UIScreen.main.bounds
baseView.frame = view.frame
baseView.backgroundColor = UIColor.black
//baseView.alpha = appearence.backgroundAlpha
view.addSubview(baseView)
contentView.backgroundColor = UIColor.white
contentView.layer.cornerRadius = 0.5
contentView.frame = CGRect(x: 10, y: 10, width: 200, height: 200)
contentView.layer.masksToBounds = true
contentView.center = CGPoint(x: self.view.bounds.midX , y: self.view.bounds.midY )
baseView.addSubview(contentView)
headView.frame = CGRect(x: 0, y: 0, width: contentView.bounds.width, height: contentView.bounds.height / 2)
headView.backgroundColor = UIColor.yellow
contentView.addSubview(headView)
headImageView.image = UIImage(named: "patternsPlaceholder")
headImageView.contentMode = .center
headImageView.frame.size = headImageView.image!.size
headImageView.center = CGPoint(x: headView.bounds.midX, y: headView.bounds.midY)
headView.addSubview(headImageView)
}
func setVisible(){
let rootView = UIApplication.shared.keyWindow! as UIWindow
rootView.addSubview(self.view)
}
func animateView(view: UIView){
view.center = CGPoint(x: self.view.bounds.midX, y: self.view.bounds.minY - view.bounds.midY)
UIView.animate(withDuration: 0.2, animations: {
view.center = CGPoint(x: self.view.bounds.midX , y: self.view.bounds.midY + 50)
}, completion: {(finished) -> Void in
UIView.animate(withDuration: 0.1, animations: {
view.center = CGPoint(x: self.view.bounds.midX , y: self.view.bounds.midY )
})
})
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
And below is the my baseviewController code.
import UIKit
class ViewController: UIViewController {
var popView = PopView()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func popViewButtonAction(_ sender: Any) {
// let popView = PopView()
popView.setVisible()
popView.animateView(view: popView.contentView)
let recognizer = UITapGestureRecognizer(target: self, action: #selector(self.hide(_: )))
recognizer.numberOfTapsRequired = 1
popView.view.addGestureRecognizer(recognizer)
print(String(describing: popView.view.gestureRecognizers))
}
func hide(_ recognizer: UITapGestureRecognizer){
self.popView.view.removeFromSuperview()
let rootView = UIApplication.shared.keyWindow! as UIWindow
rootView.addSubview(self.view)
}
}
I hope it will give you Idea.
Thanks,
Shankar