Push View Controller From Child View Controller - ios

Question

I have an app where there is a "DadViewController" which contains a UIScrollView that has paging enabled. Each page is populated with a different UIViewController.
How Do I push a new UIViewController, from a button tap, within one of the controllers contained in the UIScrollView?
class DadView: UIView {
let model = DadModel()
let scrollView: UIScrollView = {
let view = UIScrollView()
view.isPagingEnabled = true
// Additional setup...
return view
}()
override init(frame: CGRect) {
super.init(frame: frame)
setupScrollView()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
fileprivate func setupScrollView() {
self.addSubview(scrollView)
// Autolayout code to pin scrollview to all 4 sides
let vc1 = VC1()
scrollView.addSubview(vc1.view)
vc1.view.frame = CGRect(x: 0, y: 0, width: SCREEN_WIDTH, height: SCREEN_HEIGHT)
// Add additional view controller views with the appropriate frames...
}
}
class DadController: UIViewController {
var dadView: DadView!
override func loadView() {
super.loadView()
dadView = DadView()
view = dadView
}
override func viewDidLoad() {
super.viewDidLoad()
}
}
class VC1: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .green
}
}

Answer 1

Change your DadView setupScrollView to accept a UIViewController instance as argument. And don't call this method in init
class DadView: UIView {
let model = DadModel()
let scrollView: UIScrollView = {
let view = UIScrollView()
view.isPagingEnabled = true
// Additional setup...
return view
}()
override init(frame: CGRect) {
super.init(frame: frame)
// setupScrollView()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
fileprivate func setupScrollView(_ parentVC: UIViewController) {
self.addSubview(scrollView)
// Autolayout code to pin scrollview to all 4 sides
let vc1 = VC1()
vc1.view.frame = CGRect(x: 0, y: 0, width: SCREEN_WIDTH, height: SCREEN_HEIGHT)
parentVC.addChild(vc1)
scrollView.addSubview(vc1.view)
vc1.didMove(toParent: parentVC)
// Add additional view controller views with the appropriate frames...
}
}
In DadViewController after creating DadView instance call setupScrollView method with self
class DadController: UIViewController {
var dadView: DadView!
override func loadView() {
super.loadView()
dadView = DadView()
dadView.setupScrollView(self)
view = dadView
}
override func viewDidLoad() {
super.viewDidLoad()
}
}
Then you can get parent view controller from child viewcontroller and perform push
class VC1: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .green
}
#IBAction func buttonAction(_ sender: UIButton) {
self.parent?.navigationController?.pushViewController(NewVC(), animated: true)
}
}