Want to push to another view controller from a container view - ios

Question

What do i have: A view controller (WhereViewController) with some "child/container"-views. One is a collection view (typeCollectionView). the WhereViewController is embedded in a navigationController:
Screenshot
class WhereViewController: UIViewController {
lazy var progressContainerView: ProgressBarView = {
let containerView = ProgressBarView(frame: CGRect(x: 0, y: 0, width: 0, height: 0))
containerView.translatesAutoresizingMaskIntoConstraints = false
return containerView
}()
let questionLabel: UILabel = {
let label = UILabel()
label.text = "question?"
label.textAlignment = NSTextAlignment.center
label.font = UIFont.init(name: "OpenSans-Italic", size: 14)
label.textColor = UIColor(red:0.33, green:0.33, blue:0.33, alpha:1.0)
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
let typeCollectionView: WhereCollectionView = {
let collectionView = WhereCollectionView(frame: CGRect(x: 0, y: 0, width: 0, height: 0))
collectionView.translatesAutoresizingMaskIntoConstraints = false
return collectionView
}()
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.title = "Schaden melden"
view.backgroundColor = UIColor.white
view.addSubview(progressContainerView)
view.addSubview(questionLabel)
view.addSubview(typeCollectionView)
setupProgressContainerView()
setupQuestionLabel()
setupTypeCollectionView()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
private func setupProgressContainerView() {
progressContainerView.topAnchor.constraint(equalTo: view.topAnchor, constant: 60).isActive = true
progressContainerView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
progressContainerView.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true
progressContainerView.heightAnchor.constraint(equalToConstant: 50).isActive = true
}
private func setupQuestionLabel() {
questionLabel.topAnchor.constraint(equalTo: progressContainerView.bottomAnchor, constant: 22).isActive = true
questionLabel.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
questionLabel.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true
questionLabel.heightAnchor.constraint(equalToConstant: 20).isActive = true
}
private func setupTypeCollectionView() {
typeCollectionView.topAnchor.constraint(equalTo: questionLabel.bottomAnchor, constant: 20).isActive = true
typeCollectionView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
typeCollectionView.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true
typeCollectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
}
}
Want am I trying to do: Within the typeCollectionView: If an item is selected (didSelectItemAt) i want to push to the next viewController via navigationController of the WhereViewController. My typeCollectionView looks like:
class WhereCollectionView: UICollectionView, UICollectionViewDelegateFlowLayout, UICollectionViewDataSource {
var whereViewController: WhereViewController?
let label = ["x", "y", "z"]
override init(frame: CGRect, collectionViewLayout layout: UICollectionViewLayout) {
let layout = UICollectionViewFlowLayout()
super.init(frame: CGRect.zero, collectionViewLayout: layout)
backgroundColor = UIColor.white
delegate = self
dataSource = self
self.register(WhereCollectionViewCell.self, forCellWithReuseIdentifier: "WhereCollectionViewCell")
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of items
return label.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "WhereCollectionViewCell", for: indexPath) as! WhereCollectionViewCell
cell.injureLabel.text = label[indexPath.row]
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: self.frame.width, height: 75)
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
}
}
I've tried to give the whereViewController to the typeCollectionView:
let typeCollectionView: WhereCollectionView = {
let collectionView = WhereCollectionView(frame: CGRect(x: 0, y: 0, width: 0, height: 0))
collectionView.translatesAutoresizingMaskIntoConstraints = false
collectionView.whereViewController = self
return tableView
}()
But get: Cannot assign value of type '(NSObject) -> () -> WhereViewController' to type 'WhereViewController?'
Could someone help me? or isn't it possible to "speak" with the navigationController from the collectionView (containerView)?
I do not use storyboard

Answer 1

Try to:
1) Add extension:
extension UIView {
var parentViewController: UIViewController? {
var parentResponder: UIResponder? = self
while parentResponder != nil {
parentResponder = parentResponder!.next
if parentResponder is UIViewController {
return parentResponder as! UIViewController!
}
}
return nil
}
}
2) Now you can use:
parentViewController?.present(<ControllerName>, animated: true)
Hope it helps

Answer 2

You should conform the view controller to the collection delegate methods and not the collection view itself.
Make WhereViewController conform to UICollectionViewDataSource, UICollectionViewDelegate and UICollectionViewDelegateFlowLayout:
class WhereViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout
In WhereViewController's viewDidLoad method, set up the delegate and the data source:
override func viewDidLoad() {
super.viewDidLoad()
typeCollectionView.dataSource = self
typeCollectionView.delegate = self
[...]
}

Answer 3

Here you can use delegate to send message from CollectionView to
ViewController.
Simple declare a protocol
protocol CustomDelegate: class {
func collectionView(DidSelect : Int)
}
After that make an instance of CustomDelegate protocol in WhereCollectionView Class
class WhereCollectionView: UICollectionView {
weak var customDelegate:CustomDelegate?
}
and in didSelect methods fire the delegate method
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
if let _del = customDelegate {
_del.collectionView(DidSelect : IndexPath.row)
}
}
In ViewController there you are adding collectionview in viewcontroller set delegate to self
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.title = "Schaden melden"
view.backgroundColor = UIColor.white
typeCollectionView.customDelegate = self
view.addSubview(progressContainerView)
view.addSubview(questionLabel)
view.addSubview(typeCollectionView)
setupProgressContainerView()
setupQuestionLabel()
setupTypeCollectionView()
}
Also Implement the Custom delegate method in ViewController
func collectionView(DidSelect : Int) {
/// from there you can do your job
}