Swiftui Cannot mix up a UIViewController + Complier bug problem

August 16, 2022

I have a problem that i fixed for 2 days still cannot solve. My project is like this.

struct ContentView: View{
     var body: some View{
           Controller()
     }
}

struct Controller: UIViewControllerRespresentable{
     func makeUIViewController(context: Context) -> Contro {
          let viewController = Contro()
          //additional setup
          return viewController
     }
     func updateUIViewController(_ uiViewController: Contro, context: Context) {
         //update Content
     }
}

class Contro: UIViewController{
     override func viewDidAppear(_ animated: Bool){
          let alert = UIAlertController(title: "Rename Subject", message: "", preferredStyle: .alert)
          alert.addTextField{ value in
              value.placeholder = "subject name"
              value.returnKeyType = .continue
          }
          alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
          alert.addAction(UIAlertAction(title: "Done", style: .default, handler: { _ in
            guard let fields = alert.textFields, fields.count == 1 else {
                return
            }
            guard let texts = fields[0].text, !texts.isEmpty else {
                return
            }
            UserDefaults.standard.set(texts, forKey: "RenamedSubjectName")
            DispatchQueue.main.asyncAfter(deadline: .now() + 0.0001){
                self.dismiss(animated: true)
            }

            present(alert, animated: true)
        }
     }
}

And the compiler load and load and say: cannot build app, the compiler cannot check the error now, try to break it up to sub-expresstions

So how to solve? I will thank everyone who helped me 😀

>Solution :

Replace Controller with this:

struct Controller: UIViewControllerRespresentable{
     func makeUIViewController(context: Context) -> Contro {
          let viewController = Contro()
          //additional setup
          return viewController
     }
     func updateUIViewController(_ uiViewController: Contro, context: Context) {
         //update Content
     }
}

You should use the name of your UIVIewController instead of ViewController same as contro.