Return 来自另一个视图的文本错误，缺少参数参数

Question

struct SettingsView: View {
    
    var body: some View {
         
         welcomeView()    
              //:Missing argument for parameter 'currentAuthStat' in call

     }
}

struct welcomeView: View {
    @Binding var currentAuthStat: UNNotificationSetting
    
    var body: some View {
        explanatoryText
    }
    
    
    private var explanatoryText: Text {
        let explanatoryText: Text
        switch currentAuthStat {
        case .enabled:
            explanatoryText = Text("Notifications are enabled")
            + Text(Image(systemName: "checkmark"))
        default:
            explanatoryText = Text("Notifications disabled ")
            + Text(Image(systemName: "x.squareroot")) 
        }
        return explanatoryText
    }//: explanatoryText
}

当我尝试在 SettingsView 中显示 welcomeView() 时出现错误 “调用中缺少参数 'currentAuthStat' 的参数” 我尝试将 @State var 添加到 SettingsView，但随后在 ContentView 中进行调用时出现错误，当我将其添加到 ContentView 时，它希望我将其添加到 App{} @main 页面中，然后我收到一个错误 app does不符合 View().

如何将此解释文本传递给另一个视图？

Answer 1

你应该学习和学习@State和@Binding的使用，因为它是基础使用 SwiftUI。这是修复您收到的错误的可能方法：

import SwiftUI

@main
struct TesttApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}
struct ContentView: View {
    var body: some View {
        SettingsView()
    }
}
 
struct SettingsView: View {
    @State var currentAuthStat: UNNotificationSetting = .enabled // <-- here give it a value
    
    var body: some View {
        welcomeView(currentAuthStat: currentAuthStat) // <-- pass it to the welcomeView
    }
}

struct welcomeView: View {
    // unless you change currentAuthStat, there is no need for Binding
    @State var currentAuthStat: UNNotificationSetting // <-- here receive the value
    
    var body: some View {
        explanatoryText
    }
    
    private var explanatoryText: Text {
        let explanatoryText: Text
        switch currentAuthStat {
        case .enabled:
            explanatoryText = Text("Notifications are enabled")
            + Text(Image(systemName: "checkmark"))
        default:
            explanatoryText = Text("Notifications disabled ")
            + Text(Image(systemName: "x.squareroot"))
        }
        return explanatoryText
    }//: explanatoryText
}

EDIT1：currentAuthStat 被用户更改的情况：

struct welcomeView: View {
    // if you want to change currentAuthStat, use a Binding
    @Binding var currentAuthStat: UNNotificationSetting // <--- here a Binding 
    
    var body: some View {
        VStack (spacing: 55){
            explanatoryText
            Button("disabled setting"){
                currentAuthStat = .disabled  // <--- here test change
            }
        }
    }
    
    private var explanatoryText: Text {
        let explanatoryText: Text
        switch currentAuthStat {
        case .enabled:
            explanatoryText = Text("Notifications are enabled")
            + Text(Image(systemName: "checkmark"))
        default:
            explanatoryText = Text("Notifications disabled ")
            + Text(Image(systemName: "x.squareroot"))
        }
        return explanatoryText
    }//: explanatoryText
}

Return 来自另一个视图的文本错误，缺少参数参数

Return Text from another view Error, missing argument parameter

swiftui

swiftui-view