swift - 将 boolean 值更改为 Int

Question

我正在寻求您的帮助来帮助我制作我的第一个应用程序。我白天是盲人和视障人士的老师，正在尝试制作一个应用程序用于对学生进行评估。在这个特定部分中，我们正在评估他们的位置/空间技能。我们喜欢使用切换的便利性，但我很难将 bool 值更改为 Int 以获得每个部分的分数。我希望 true = 1 和 false = 0。数字分数将列在每个部分下方，我已经将其编码出来。

我尝试使用“扩展”来更改值，但不断收到错误。我可以将它们全部更改为分段选择器，并获得接近相同的易用性，但希望有一个更简单的解决方案，因为我已经编写了大约 100 个这样的代码。提前致谢!

struct caneSkills: View {
    @State var front = false
    @State var behind = false
    @State var onTop = false
    @State var below = false
    @State var between = false
    @State var nextTo = false
    @State var under = false
    @State var onBottom = false
    @State var inBack = false
    @State var onTheSide = false
    var body: some View {
        let psScore = (front + behind + onTop + below + between + nextTo + under + onBottom + inBack + onTheSide)
        NavigationView {
            Form {
                Section(header: Text("Positional/Spatial Concepts")) {
                    Toggle("Behind", isOn: $behind)
                    Toggle("Below", isOn: $below)
                    Toggle("In Back", isOn: $inBack)
                    Toggle("In Between", isOn: $between)
                    Toggle("In Front", isOn: $front)
                    Toggle("Next To", isOn: $nextTo)
                    Toggle("On The Bottom", isOn: $onBottom)
                    Toggle("On Side", isOn: $onTheSide)
                    Toggle("On Top", isOn: $onTop)
                    Group {
                        Toggle("Under", isOn: $under)
                        Text("Positional/Spatial Concepts Score: \(psScore) / 10")
                            .font(.headline)
                        .foregroundColor(Color.blue)
                    }
                }
            }
            .navigationTitle("Cane Skills")
        }
        .navigationViewStyle(StackNavigationViewStyle())
    }       
}

Answer 1

只是为了好玩，您可以扩展 Bool 类型并向其添加值属性。然后，您可以简单地创建一个自定义运算符来对所有 bool 元素求和:

extension Bool {
    var value: Int { self ? 1 : 0 }
    public static func + (lhs: Int, rhs: Bool) -> Int {
        lhs + rhs.value
    }
}

---

我还会构建数据技能。这样你就可以拥有一个包含你所有技能的数组:

struct Skill {
    let name: String
    var isOn: Bool
}

---

struct CaneSkills: View {
    
    @State var skills = [
        ("Behind", false),
        ("Below", false),
        ("In Back", false),
        ("In Between", false),
        ("In Front", false),
        ("Next To", false),
        ("On The Bottom", false),
        ("On Side", false),
        ("On Top", false),
        ("Under", false)
    ].map(Skill.init)
    
    var body: some View {
        NavigationView {
            Form {
                Section(header: Text("Positional/Spatial Concepts")) {
                    ForEach(skills.indices, id: \.self) { index in
                        Toggle(skills[index].name, isOn: $skills[index].isOn)
                    }
                    Text("Score: \(psScore) / 10")
                        .font(.headline)
                        .monospacedDigit()
                        .foregroundColor(Color.blue)
                        .frame(maxWidth: .infinity, alignment: .trailing)                    }
            }
            .navigationTitle("Cane Skills")
        }
        .navigationViewStyle(StackNavigationViewStyle())
    }
}

---

extension CaneSkills {
    var psScore: Int {
        skills.reduce(0) { $0 + $1.isOn }
    }
}

---

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

---