SwiftUI Xcode 11 beta 5 / 6: Type of expression is ambiguous without more context

Question

Since beta 5 my Project won\'t compile anymore. The error is \"Type of expression is ambiguous without more context\"for that Button\'s Text. I thought it would

Answer 1

After your update in your answer, I see some changes needed:

• Use ObservableObject (no need to use Combine.ObservableObject)
• Missing function scanPassport, I added a bogus one.
• willChange no longer exists, it is now objectWillChange. And it is autosynthesize for you.

import SwiftUI

class ClPassport : ObservableObject , Identifiable {


    @Published var mrz : String =  "" //{ didSet { update() } }
    var isValid : Bool {
        return true
    }

    func update() {
        objectWillChange.send()
    }

    func getMRZKey() -> String {
     return ""
    }
}


struct ContentView : View {

    @ObservedObject var passportDetails = ClPassport()
      var body: some View {

         ZStack{
           VStack(alignment: .leading){
             HStack{
                  Spacer()
                  Button(action: {
                      self.scanPassport( mrzKey: self.passportDetails.getMRZKey() )
                    }) {
                        Text("Read Chip")
                            .font(.largeTitle)
                        .foregroundColor(passportDetails.isValid ? .primary : Color.secondary.opacity(0.25))
                            .padding()
                        }.padding()
                        .background(Color.white.opacity(passportDetails.isValid ? 1 : 0.5))
                        .cornerRadius(15)
                        .padding()
                        .disabled( !passportDetails.isValid )
                   Spacer()
              }
            TextField("MRZ", text: $passportDetails.mrz)
            }
          }
        }

 func scanPassport( mrzKey: String ) {
   //do stuff with mrzKey
 }
}