5 分钟，带你快速撸一个 iOS App

import SwiftUI
import Combine

struct ContentView: View {
    
    ...
    
    //构建页面View
    var body: some View {
        VStack(alignment: HorizontalAlignment.center){
           ...
        }
    } 
}

import SwiftUI
import Combine

struct ContentView: View {
    
    //构建页面View
    var body: some View {
        VStack(alignment: HorizontalAlignment.center){
            Image("WechatIMG5")
            
            TextField("用户名", text: $username).textFieldStyle(RoundedBorderTextFieldStyle())
                .keyboardType(.numberPad)
                .padding()
            
            TextField("密码", text: $pwd).textFieldStyle(RoundedBorderTextFieldStyle())
                .keyboardType(.numberPad)
                .padding()
            
            //是否为测试
            Toggle(isOn: $isFavorited) {
                Text("测试环境")
                }.padding(.leading, 0.0).frame(width: 140, height: 40)

            Button(action: {
                //具体的操作         }       struct ContentView_Previews: PreviewProvider {
        static var previews: some View {
            ContentView()
        }
    }   
    
}

struct ContentView: View {
    
    @State  var username:String = "用户名"
    @State  var pwd:String = "密码"
    @State  var result:String = "结果"
    @State  var isFavorited:Bool = false
        
}

Button(action: {
                //具体的操作
                print("start")
                
                var url = ""
                
                if(self.isFavorited){
                   url = "...?username=" + self.username + "&password=" + self.pwd
                }else{
                   url = "...?username=" + self.username + "&password=" + self.pwd
                }
                
                print("请求地址:"+url)
                
                AF.request(url).responseJSON { response in
                    switch response.result {
                    case .success(let json):
                        //转为Dictionary
                        let post_paramsValue = json as! Dictionary<String,Any>
                        
                        //__NSCFString
                        let msg = post_paramsValue["msg"]!
                        //转为String
                        let msg_pro = msg as! String
                        
                        self.result = msg_pro
                        
                        break
                    case .failure(let error):
                        print("error:\(error)")
                        self.result = "网络异常，请稍后再试！"
                        break
                    }
                }
                
            }) {
                Text("一键执行")
                    .foregroundColor(Color.white)
                    .padding(10)
                    .background(Color.gray)
                    .cornerRadius(6)
                    .padding(10)
                    .frame(alignment: .center)
            }
            
            TextField("结果区域", text: $result)
                .padding()
        }