How to run a function from switch statement in swiftui? - swiftui

Question

I trying to run a function with parameter from a switch statement in swiftui but kept getting the "Type '()' cannot conform to 'View'" error. I think the switch statement and the function should be correct. No matter how I play around with the case statement, I'll still get the same error message.
struct questionsData: Codable {
enum CodingKeys: CodingKey {
case question
case answers
case correctAnswerIndex
}
//var id = UUID()
var question: String
var answers = [String]()
var correctAnswerIndex: Int
}
struct ThemeView: View {
var quizzes = [questionsData]()
let themeName: String
var body: some View {
let themeselected: String = themeName
var jsonfile: String = ""
switch themeselected {
case "Money Accepted":
jsonfile = "Accounts"
return loadQuizData(jsonname: jsonfile)
case "Computers":
jsonfile = "Computers"
return loadQuizData(jsonname: jsonfile)
default:
Text("invalid")
}
}
func loadQuizData(jsonname: String){
guard let url = Bundle.main.url(forResource: jsonname, withExtension: "json")
else {
print("Json file not found")
return
}
let data = try? Data(contentsOf: url)
var quizzes = try? JSONDecoder().decode([questionsData].self, from: data!)
quizzes = quizzes!
}
}
struct ContentView: View {
#State private var selection: String?
let quizList = ["Money Accepted","Computers","Making an appointment", "Late again", "Shopping", "Renting a place", "Accounts", "Letter Writing", "Planning a business", "Business Expression 1", "Business Expression 2", "How to ask the way"]
var body: some View {
NavigationView{
List(quizList, id:\.self) { quizList in
NavigationLink(destination: ThemeView(themeName: quizList)){
Text(quizList)
}
}
.navigationTitle("Select quiz theme")
}
}
}
Please kindly assist... still new to swiftui.
Greatly appreaciated.

Answer 1

I don't get exactly how your ThemeView should look like, maybe you can show us a preview. But there are some mistakes in there. Firstly, try to extract that logic in a ViewModel. Basically have a separate layer to handle business logic such as json parsing and other stuff. Secondly, try not to have var in views, unless they are marked as #State, #Binding, #ObservedObject... . Not least, SwiftUI views should create views not handle logic such as ViewControllers in UIKit, your switch create no view this is why it does not conform to View.