ViewController's for SwiftUI.

The core idea is that the ViewController is owning, or at least driving, the View(s). Not the other way around.

Blog entry explaining all the things: Model View Controller for SwiftUI

Just the basics to get started quickly.

• create a SwiftUI project in Xcode (iOS is tested better)
• add the ViewController package, e.g. via git@github.com:ZeeZide/ViewController.git
• create a new RootViewController, e.g. HomePage.swift:

  import ViewController
  
  class HomePage: ViewController {
    
    var view: some View {
      VStack {
        Text("Welcome to MWC!")
          .font(.title)
          .padding()
        
        Spacer()
      }
    }
  }

• Instantiate that in the scene view, the ContentView.swift generated by Xcode:

  import ViewController
  
  struct ContentView: View {
    var body: some View {
      MainViewController(HomePage())
    }
  }

• Compile and Run, should show the HomePage

• create a new ViewController, e.g. Settings.swift:

  import ViewController
  
  class Settings: ViewController {
    
    var view: some View { // the View being controlled
      VStack {
        Text("Welcome to Settings!")
          .font(.title)
          .padding()
        
        Spacer()
      }
    }
  }

• Add an action to present the Settings from the HomePage:

  import ViewController
  
  class HomePage: ViewController {
  
    func configureApp() {
      show(Settings()) // or `present(Settings())`
    }
    
    var view: some View {
      VStack {
        Text("Welcome to MWC!")
          .font(.title)
          .padding()
          
        Divider()
        
        Button(action: self.configureApp) {
          Label("Configure", systemImage: "gear")
        }
        
        Spacer()
      }
    }
  }

Pressing the button should show the settings in a sheet.

• Wrap the HomePage in a NavigationController, in the scene view:

  import ViewController
  
  struct ContentView: View {
    var body: some View {
      MainViewController(NavigationController(rootViewController: HomePage()))
    }
  }

Note pressing the button does a navigation. Things like this should also work:

func presentInSheet() {
  let vc = SettingsPage()
  vc.modalPresentationStyle = .sheet
  present(vc)
}

The presentations so far make use of a hidden link. To explicitly inline a NavigationLink, use PushLink, which wraps that.

• Add a PushLink (until I get an NavigationLink init extension working) to present the Settings from the HomePage:

  import ViewController
  
  class HomePage: ViewController {
    
    var view: some View {
      VStack {
        Text("Welcome to MWC!")
          .font(.title)
          .padding()
          
        Divider()
        
        PushLink("Open Settings", to: Settings())
        
        Spacer()
      }
    }
  }

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