ViewController's for SwiftUI

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

Quick: How to Use

Just the basics to get started quickly.

Step A: Setup Project and Root VC

• 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

Step B: Add a presented VC and navigate to it

• 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.

Step C: Add a NavigationController for Navigation ?

• 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)
}

Adding a PushLink

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()
      }
    }
  }

Who

ViewController is brought to you by ZeeZide. We like feedback, GitHub stars, cool contract work, presumably any form of praise you can think of.

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GitHub

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