How to access UIView in ViewController when calling function from another file? - ios

Question

Situation: I paint stuff through a button-click on a subview. Then I add the subview to the view.
Problem: When calling drawNew from another swift file, the if-loop is not triggered. Probably because the view with the tag 777 does not get found.
Question: How do I tell the code to look for the view in ViewController?
When do I call the function drawNew()? I call it from another file with override func touchesEnded(...)
//###########################
// ViewController.swift
//###########################
var dv = Painting() // in here are functions to create a cg path
//
// IBActions
//
#IBAction func buttonPressed(_ sender: UIButton) {
// painting
if sender.tag == 1 {
drawNew()
} else if sender.tag == 2 {
CanvasView.clearCanvas()
}
}
//
// FUNCTIONS
//
func drawNew() {
dv.makeMeSomePath()
if let foundView = view.viewWithTag(777) { // problem lies here maybe
dv.tag = 111
foundView.addSubview(dv)
print("added subview")
}
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
// prepare the canvas for
let newView = CharacterView(frame: CGRect(x: 0,
y:0,
width: HandwritingCanvasView.frame.width,
height: HandwritingCanvasView.frame.height))
newView.tag = 777
HandwritingCanvasView.addSubview(newView)
// self.view.addSubview(demoView)
}
Then this is the other file from where I call the drawNew() func
// HandwritingCanvasView.swift
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
ViewController.drawNew()
}

Answer 1

It will be easier to have reference on newView in ViewController.
Try to do next
//###########################
// ViewController.swift
//###########################
weak var subView: UIView? //Add reference on your view
//
// FUNCTIONS
//
func drawNew() {
dv.makeMeSomePath()
if let foundView = subView { // Use the reference instead of searching view with tag
dv.tag = 111
foundView.addSubview(dv)
print("added subview")
}
}
override func viewDidAppear(_ animated: Bool) {
// Your code is here
// ...
HandwritingCanvasView.addSubview(newView)
subView = newView
//...
}