UIScrollView with subviews taps not being excluded if superview is involved - ios

Question

So I am trying to create an interface in which there are essentially 3 levels of views possible.
The UIView in charge of deciding the meta-data of new cells
The cells themselves
The background UIScrollView
Everything is a child of the UIScrollView however 1 is displayed on top of 2.
The goal is that all the cells are draggable and the scroll view is scrollable. However when the scroll view is tapped that should trigger the creation of a new node and thus the appearance of view 1 which will disappear upon the press of a submit button.
I have set up just about everything except I have one huge problem. If I tap on a cell I still get the creation view meaning that the TapGestureRecognizer isnt excluding subviews. So here is roughly what is set up:
class Node: UILabel {
var recognizer:UIPanGestureRecognizer?
init() {
self.isExclusiveTouch = true
self.isUserInteractionEnabled = true
recognizer = UIPanGestureRecognizer(target: self, action: #selector(drag))
self.addGestureRecognizer(recognizer!)
}
#objc
func drag(rec: UIPanGestureRecognizer) {
goToPoint(point: rec.location(in: self.superview!))
}
public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
var shouldReceive = false
if let clickedView = touch.view {
if clickedView == self {
shouldReceive = true;
}
}
return shouldReceive
}
}
class NodeCreator: UIView {
var submit: UIButton = UIButton(type: UIButton.ButtonType.roundedRect)
init() {
super.init(frame: CGRect.zero)
submit.setTitle("Submit", for: .normal)
submit.translatesAutoresizingMaskIntoConstraints = false
submit.addTarget(self, action: #selector(press), for: .touchUpInside)
self.addSubview(submit)
}
#objc func press() {
if let d = delegate {
if let t = inputField.text {
d.created(title: t, pt: storeP)
self.removeFromSuperview()
}
}
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
class TaskView: UIScrollView, CreationDelecate{
func created(title: String, pt: CGPoint) {
let temp = Node()
view.addNode(temp, at: pt)
}
var tapRecognizer:UITapGestureRecognizer?
var nodeSet:[Node] = []
func addNode(_ n1: Node, at: CGPoint = CGPoint.zero) {
nodeSet.append(n1)
n1.goToPoint(point: at)
self.addSubview(n1)
self.bringSubviewToFront(n1)
self.isScrollEnabled = true
self.isUserInteractionEnabled = true
self.isExclusiveTouch = false
self.canCancelContentTouches = false
if (tapRecognizer == nil) {
tapRecognizer = UITapGestureRecognizer(target: self, action: #selector(tap))
self.addGestureRecognizer(tapRecognizer!)
}
}
#objc func tap(rec: UITapGestureRecognizer) {
let pos = rec.location(in: self)
let creator = NodeCreator(pt: pos)
creator.delegate = self
self.addSubview(creator)
}
public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
var shouldReceive = false
if let clickedView = touch.view {
if clickedView == self {
shouldReceive = true;
}
}
return shouldReceive
}
}
Why is the TaskView still receiving tap gestures when the Nodes are all exclusive touch.

Answer 1

Code does not work because you did not assigned delegate for gesture recognizers. Delegate functions are implemented in Node and TaskView classes. But you did not declared classes as delegates i.e.
class TaskView: UIScrollView, CreationDelecate, UIGestureRecognizerDelegate
Than assign delegate to gesture recognizer:
recognizer.delegate = self as! UIGestureRecognizerDelegate
Should work