Ch 9 State and Binding

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1

In the discussion about State and binding of numberOfAnswered between the ScoreView and ChallengeView… The book had suggested that only the variable in ChallengeView will get updated. However, when i tried this in code, i’m getting the opposite result (only Scoreview is getting updated, not ChallengeView). So i’m a little confused… I’m running this with Xcode 11.6 and Xcode 12 beta 4 with the same result… am i doing soemthing wrong?

ChallengeView

 struct ChallengeView: View {
        let challengeTest: ChallengeTest
        @State var showAnswers = false
        @State var numberOfAnswered = 0
    
  var body: some View {
    VStack {
        Button(action: {
            self.showAnswers = !self.showAnswers
            self.numberOfAnswered += 1
        }) {
            QuestionView(question: challengeTest.challenge.question)
                .frame(height:300)
            
            if showAnswers {
                Divider()
                
                ChoicesView(challengeTest: challengeTest)
                    .frame(height:300)
                    .padding()
            }
        }
        ScoreView(numberOfAnswered: numberOfAnswered, numberOfQuestions: 5)
        Text("Challenge VIew Counter: \(numberOfAnswered)")

    }
  }
}

ScoreView

   struct ScoreView: View {
    @State var numberOfAnswered: Int
    let numberOfQuestions : Int
    
    var body: some View {
        HStack {
            Button(action: {
                self.numberOfAnswered += 1
                Text("\(self.numberOfAnswered)/\(numberOfQuestions)")
                .font(.caption)
                .padding(4)
                Text("Score VIew Counter: \(numberOfAnswered)")

            Spacer()
            }
        }
    }
}
2

never mind… i was clicking on the wrong button… :sweat_smile:

3

Cool :slight_smile: so it works as expected, right?

1 Like
4

@abnopanda Do you still have issues with this?