这篇文章是我自己在实现Radio按钮功能的时候，因为自己也是初学者，所以在GitHub上着了相关的案例，并进行了一定的改修，这里做一下学习记录。

import SwiftUI

struct MyTmpView: View {
    let items: [String] = ["item 1", "item 2", "item 3", "item 4", "item 5"]
    //确定被选中的item
    @State var selectedID = ""
    
    var body: some View {
        VStack{
            ForEach(items, id: \.self){item in
                RadioButton(id: item, selectedID: self.selectedID, callBack: self.radioButtonCallBack)
            }
        }
    }
    //将被选中的item的id赋值
    func radioButtonCallBack(id: String) {
        self.selectedID = id
    }
}
///每一个独立的Radio 组件
struct RadioButton: View {
    let id: String
    let selectedID: String
    let callBack: (String) -> ()
    //初始化
    init(id: String, selectedID: String, callBack: @escaping (String) -> ()){
        self.id = id
        self.selectedID = selectedID
        self.callBack = callBack
    }
    
    var body: some View {
        Button(action: {
            self.callBack(self.id)
        }, label: {
            HStack(alignment: .center, spacing: 12, content: {
                Image(systemName: self.selectedID == self.id ? "checkmark.circle.fill" : "circle")
                    .foregroundColor(self.selectedID == self.id ? Color.blue : Color.black)
                Text(self.id)
                    .font(Font.system(size: 20))
                    .foregroundColor(Color.black)
            })
        })
    }
}

struct MyTmpView_Previews: PreviewProvider {
    static var previews: some View {
        MyTmpView()
    }
}

• 效果图