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swift - 如果选择了新按钮，则取消选择所有其他按钮选择

问题描述

我有这个代码：

import SwiftUI
struct PlayButton: View {
    @Binding var isClicked: Bool

    var body: some View {
        Button(action: {
            self.isClicked.toggle()
        }) {
            Image(systemName: isClicked ? "checkmark.circle.fill" : "circle")
        }
    }
}

struct ContentView: View {
    @State private var isPlaying: Bool = false
    var players : [String] = ["Crown" , "King" , "Queen" , "Prince"]
    
    var body: some View {
        VStack {
          ForEach(players, id: \.self) { player in
            HStack {
                Text(player)
                PlayButton(isClicked: $isPlaying)
            }
           }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
  static var previews: some View {
    ContentView()
  }
}

如果我选择一个新按钮，我想取消选择所有其他先前选择的按钮。例如，如果我选择 King 并选择 Queen ，则 King 被取消选择。我怎样才能做到这一点

我做了什么。老实说，我无法提出解决方案。

标签： swiftcheckboxswiftuitoggle

解决方案

我知道这可能看起来需要更多代码来提供答案，但我的假设是您正在尝试制作一个真实世界的应用程序。一个真实世界的应用程序应该是可测试的，所以我的答案来自一个你可以测试你的逻辑与你的 UI 分开的地方。此解决方案允许您使用数据从模型角度驱动视图正在执行的操作。

import SwiftUI
class PlayerModel {
    let name: String
    var isSelected : Bool = false
    init(_ name: String){
        self.name = name
    }
}
class AppModel: ObservableObject {
    let players : [PlayerModel] = [PlayerModel("Crown") , PlayerModel("King") ,PlayerModel("Queen") ,PlayerModel("Prince")]
    var activePlayerIndex: Int?
    init(){

    }
    func selectPlayer(_ player: PlayerModel){
        players.forEach{
                $0.isSelected = false
        }
        player.isSelected = true
        objectWillChange.send()
    }
}
struct PlayButton: View {
    let isSelected: Bool
    let action : ()->Void

    var body: some View {
        Button(action: {
            self.action()
        }) {
            Image(systemName: isSelected ? "checkmark.circle.fill" : "circle")
        }
    }
}

struct ContentView: View {
    @ObservedObject var model = AppModel()
    var body: some View {
        VStack {
            ForEach(model.players, id: \.name) { player in
                HStack {
                    Text(player.name)
                    PlayButton(isSelected: player.isSelected, action: { self.model.selectPlayer(player) })
                }
            }
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        PlayerView()
    }
}

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