How to load a UIViewController from a class that does not inherit UIviewController (from a swift file with class )?

user_7037437 0
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I am working on building framework for a widget. I have two files as follows: widgetBuilder.swift and webWidget.swift

widgetBuilder.swift is file with getters and setters that takes certain values from the app that is going to use this widget framework.

Code from widgetBuilder.swift

import Foundation
class WidgetBuilder {

    private var userId: String!
    private var emailId: String!

    public func setuserId(userId: String) -> WidgetBuilder{
        self.userId = userId
        return self
    } 

    public func setEmailId(emailId: String) -> WidgetBuilder{
        self.emailId = emailId
        return self

    }

    public func build() -> WidgetBuilder{
        // Wanted to load the webview from here 
    }
}

Once the initialization is done I would call the build function, I wanted to load the ViewController of webWidget.swift

Code from webWidget.swift 

class webWidget: UIViewController, WKUIDelegate, WKNavigationDelegate  {


    var webView: WKWebView!

    override func loadView() {
        webView = WKWebView()
        webView.uiDelegate = self
        webView.navigationDelegate = self
        view = webView
        self.loadWebView()
    }

    public func loadWebView(){
        let url = URL(string: "https://www.google.com")!
        webView.load(URLRequest(url: url))
        webView.allowsBackForwardNavigationGestures = true
    }

    public func loadWidgetScreen() {
        //Something is not correct here  
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let controller = storyboard.instantiateViewController(withIdentifier: "WidgetController") 
        self.present(controller, animated: true, completion: nil)
    }

}

How do I load the webWidget view from the widgetBuilder.swift and pass some data along ?

ios-frameworks xcode11 swift ios
2 Answers

So this is how I solved , Posting it, might be helpful for somebody looking to load a ViewController from a swift file.

Once I call the the build() from my swift file , it has to load the view,

Added a var that gets the ViewController instance from the parent view that wants to load this widget.

Inside the widgetBuilder.swift

private var clientView: UIViewController?

public init(_ viewController:UIViewController){
    self.clientView = viewController;
}

Then, 

public func build(){

    // Widget() creates ViewController instance , this viewcontroller is mapped to a widget.xib file
    let controller: UIViewController = Widget() // Creating the instance of the view class
    self.clientView?.addChild(controller) // self.clientView is the ViewController instance that wants to load widget view 
    self.clientView?.view.addSubview(controller.view)
    controller.view.frame = (clientView?.view.bounds)!
    controller.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
    controller.didMove(toParent: clientView)
}
user_70374370

In webWidget.swift replace your loadWidgetScreen() method with below

public func loadWidgetScreen() {
  if var topController = UIApplication.sharedApplication().keyWindow?.rootViewController {
      while let presentedViewController = topController.presentedViewController {
          topController = presentedViewController
      }

      // topController should now be your topmost view controller
      let storyboard = UIStoryboard(name: "Main", bundle: nil)
      let controller = storyboard.instantiateViewController(withIdentifier: "WidgetController") 
      self.present(controller, animated: true, completion: nil)
  }
  else {
    print("topViewController not found")
  }
}
user_64029590
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