UIPanGestureRecognizer on subclass UIView - ios

Question

I've been trying to lean more about subclassing certain objects.
Now I've subclassed a UIView which has a PanGestureRecognizer for swiping left and right.
Can't seem to find the problem. It won't even move the UIView. I've tried looking the lifecycle of an UIView to set the isUserInteractionEnabled to true, but with no result. See the code below:
VC
import UIKit
class SwipeViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
addNewProfile()
}
private func addNewProfile() {
let swipeView = SwiperView(frame: CGRect(x: self.view.bounds.width / 2 - 150, y: self.view.bounds.height / 2 - 75, width: 300, height: 150))
swipeView.parentView = self.view
swipeView.delegate = self
swipeView.shadow = true
swipeView.isUserInteractionEnabled = true
swipeView.backgroundColor = UIColor.white
swipeView.alpha = 0.0
view.addSubview(swipeView)
UIView.animate(withDuration: 0.3, animations: {
swipeView.alpha = 1.0
}, completion: { (succeed) in
swipeView.isUserInteractionEnabled = true
})
}
}
//MARK: - ChosenSwipeResultDelegate
extension SwipeViewController: ChosenSwipeResultDelegate {
func pickedLeftSide() {
}
func pickedRightSide() {
}
}
SwiperView
import UIKit
protocol ChosenSwipeResultDelegate {
func pickedLeftSide()
func pickedRightSide()
}
#IBDesignable class SwiperView: UIView {
private var _shadow: Bool!
private var _parentView: UIView!
var delegate: ChosenSwipeResultDelegate?
var parentView: UIView {
set {
_parentView = newValue
}
get {
return _parentView
}
}
#IBInspectable var shadow: Bool {
get {
return layer.shadowOpacity > 0.0
}
set {
if newValue == true {
addShadow()
}
}
}
#IBInspectable var cornerRadius: CGFloat {
get {
return layer.cornerRadius
}
set {
layer.cornerRadius = newValue
if shadow == false {
layer.masksToBounds = true
}
}
}
override func setNeedsLayout() {
super.setNeedsLayout()
isUserInteractionEnabled = true
}
override func awakeFromNib() {
super.awakeFromNib()
isUserInteractionEnabled = true
let dragGesture = UIPanGestureRecognizer(target: self, action: #selector(SwiperView.dragging(gesture:)))
addGestureRecognizer(dragGesture)
}
func dragging(gesture: UIPanGestureRecognizer) {
let translation = gesture.translation(in: parentView)
let tinderView = gesture.view!
tinderView.center = CGPoint(x: parentView.bounds.width / 2 + translation.x, y: parentView.bounds.height / 2 + translation.y)
let xFromCenter = tinderView.center.x - parentView.bounds.width / 2
let scale = min(100 / abs(xFromCenter), 1)
var rotation = CGAffineTransform(rotationAngle: xFromCenter / 200)
let stretch = rotation.scaledBy(x: scale, y: scale)
tinderView.transform = stretch
if gesture.state == .ended {
if tinderView.center.x < 100 {
print("left")
UIView.animate(withDuration: 0.3, animations: {
tinderView.alpha = 0.0
}, completion: { (succeed) in
self.delegate?.pickedLeftSide()
})
} else if tinderView.center.x > parentView.bounds.width - 100 {
print("right")
UIView.animate(withDuration: 0.3, animations: {
tinderView.alpha = 0.0
}, completion: { (succeed) in
self.delegate?.pickedRightSide()
})
} else {
print("Not chosen")
rotation = CGAffineTransform(rotationAngle: 0)
let stretch = rotation.scaledBy(x: 1, y: 1)
tinderView.transform = stretch
tinderView.center = CGPoint(x: parentView.bounds.width / 2, y: parentView.bounds.height / 2)
}
}
}
private func addShadow(shadowColor: CGColor = UIColor.black.cgColor, shadowOffset: CGSize = CGSize(width: 1.0, height: 2.0), shadowOpacity: Float = 0.4, shadowRadius: CGFloat = 3.0) {
layer.shadowColor = shadowColor
layer.shadowOffset = shadowOffset
layer.shadowOpacity = shadowOpacity
layer.shadowRadius = shadowRadius
}
}

Answer 1

add these code to your SwiperView see if it solves the problem
override init(frame: CGRect) {
super.init(frame: frame)
isUserInteractionEnabled = true
let dragGesture = UIPanGestureRecognizer(target: self, action: #selector(SwiperView.dragging(gesture:)))
addGestureRecognizer(dragGesture)
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
isUserInteractionEnabled = true
let dragGesture = UIPanGestureRecognizer(target: self, action: #selector(SwiperView.dragging(gesture:)))
addGestureRecognizer(dragGesture)
}