swiftui-settings.swift

import SwiftUI

struct Setting {
    enum SettingIcon {
        case system(name: String)
        case custom(name: String)
    }
    
    enum SettingType: Equatable {
        case toggle
        case menu(settings: [MenuSetting])
        case viewController(creationBlock: (() -> UIViewController))
        
        static func ==(lhs: SettingType, rhs: SettingType) -> Bool {
            switch (lhs, rhs) {
            case (.toggle, .toggle):
                return true
            case (.menu(let settings1), .menu(let settings2)):
                return settings1 == settings2
            case (.viewController, .viewController):
                // Always assume two view controller creation blocks are inequal for simplicity
                return false
            default:
                return false
            }
        }
    }
    
    let title: String
    let key: String
    let icon: SettingIcon
    let type: SettingType
}

struct MenuSetting: Equatable {
    let title: String
    let isChecked: Bool
}

var settings: [Setting] = [
    Setting(title: "Dogs Can Fly", key: "DogsCanFly", icon: .system(name: "airplane"), type: .toggle),
    Setting(title: "Dog Name", key: "DogName", icon: .system(name: "textformat"), type: .menu(settings: [
        MenuSetting(title: "Rover", isChecked: true),
        MenuSetting(title: "Phyllis", isChecked: false),
        MenuSetting(title: "Rosetta", isChecked: false),
        MenuSetting(title: "Bartholimeu", isChecked: false),
    ]))
]

struct ContentView: View {
    var body: some View {
        
        NavigationView {
            Form {
                Section {
                    ForEach(settings, id: \.key) { (setting) in
                        // Works
                        // Text(setting.title)
                        
                        // Does not work
                        switch setting.type {
                        case .toggle:
                            Text("Toggle")
                        case .setting(let menu):
                            Text("setting")
                        case .viewController (let creationBlock):
                            Text("Meep")
                        }
                    }
                }
            }
            .navigationBarTitle("Settings")
        }
    }
}