swiftUI中获取格式化显示当前时间

swiftUI中获取格式化显示当前时间，并实现计时功能

点击一次获取一次时间。
效果大致如下。

使用的时候请自行去掉ARViewContainer的部分和注释部分，懒得改了，格式请自己调整一下。

//
 //  ContentView.swift
 //  GraduationTestApp01
 //
 //  Created by Humphrey Norton on 2022/4/26.
 //  Copyright © 2022 Humphrey Norton. All rights reserved.
 //import SwiftUI
 import RealityKit
 import UIKit
 import Combine
 import Foundation//@State var settingPagePresented: Bool = false
 //@State private var settingPagePresented = falsestruct ContentView : View {
 //
 //
 //test1测试页面的跳转 --> Finished
 //    //    mark 设置属性 页面跳转属性设置
 //    @State private var settingPagePresented = false
 //
 //
 //
 //    //    @State var settingPagePresented = false
 //
 //    //    所展示的界面s
 //    var body: some View {
 //
 //        //        Button("ttt") {
 //        //            self.settingPagePresented = true
 //        //        }.sheet(isPresented: $settingPagePresented, content: {
 //        //            NupageOne()
 //        //        })
 //        //            .background(Color("Color23"))//设置背景全透明的图片展示出AR界面
 //        ZStack{
 //
 //
 //            NavigationView{
 //                ZStack{
 //                    ARViewContainer().edgesIgnoringSafeArea(.all)
 //
 //                    VStack{
 //
 //
 //                        zuikaishiBtn(title:"开始吧 跳转")
 //
 //                        NavigationLink(destination:
 //                        NupageOne() ) {
 //                            Text("next")
 //                        }
 //
 //
 //
 //
 //
 //                    }
 //
 //
 //
 //                }//ZStack
 //                    .background(Color("Color23"))//设置背景全透明的图片展示出AR界面
 //
 //            }
 //
 //
 //        }
 //
 //
 //    }//    test2测试时间的计时
 //    @State private var currentDate = Date()
 //    let timer = Timer.publish(every: 1, on: .main, in: .common)
 //
 //    @State private var second = 10
 //    private let timeHelper = TimeHelp()
 //    @State private var end = true
 //
 //    var body: some View {
 //
 //        VStack{
 //            Text("(second)")
 //            Button("begin") {
 //                guard self.end else {return}
 //                self.end = false
 //                self.second = 10
 //                self.timeHelper.start {
 //                    print(self.second)
 //                    if self.second > 0 {
 //                        _ = self.second -= 1
 //                    }else{
 //                        //暂停
 //                        self.end = true
 //                        self.timeHelper.stop()
 //                    }
 //                }
 //            }
 //            Button("end") {
 //                guard !self.end else {return}
 //                self.second = 10
 //                self.end = true
 //                self.timeHelper.stop()
 //            }
 //        }
 //
 //        .navigationBarTitle(Text("CountDown"), displayMode: .inline)
 //    }//    计时器@State var hours: Int = 0@State var minutes: Int = 0@State var seconds: Int = 0@State var timerIsPaused: Bool = true@State var timer: Timer? = nil//    设置时间戳
 //    @State private var now = Data()
 //    @State private var dformatter = DateFormatter()var body: some View {VStack {Text("(hours):(minutes):(seconds)")Button(action:{print("获取当前时间，输出！(Date().formatDate())")}){Text("当前日期时间: (Date().formatDate())")}if timerIsPaused {HStack {Button(action:{self.timer?.invalidate()//销毁时间戳self.restartTimer()print("RESTART")}){Image(systemName: "backward.end.alt").padding(.all)}.padding(.all)Button(action:{self.startTimer()print("START")}){Image(systemName: "play.fill").padding(.all)}.padding(.all)}} else {Button(action:{print("STOP")self.stopTimer()}){Image(systemName: "stop.fill").padding(.all)}.padding(.all)}}//VStack}//开始计时func startTimer(){timerIsPaused = falsetimer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true){ tempTimer inif self.seconds == 59 {self.seconds = 0if self.minutes == 59 {self.minutes = 0self.hours = self.hours + 1} else {self.minutes = self.minutes + 1}} else {self.seconds = self.seconds + 1}}}//暂停时间func stopTimer(){timerIsPaused = truetimer?.invalidate()timer = nil}//重置时间func restartTimer(){hours = 0minutes = 0seconds = 0}}//ARViewContainer结构体加载三维模型
 struct ARViewContainer: UIViewRepresentable {func makeUIView(context: Context) -> ARView {let arView = ARView(frame: .zero)// Load the "Box" scene from the "Experience" Reality Filelet boxAnchor = try! Experience.loadBox()//        parkinglot_s模型加载//    为什么未自动创建parkinglot_s的类？//        let boxAnchor = try! parkinglot_s.loadBox()// Add the box anchor to the scenearView.scene.anchors.append(boxAnchor)return arView}func updateUIView(_ uiView: ARView, context: Context) {}
 }test1
 //struct zuikaishiBtn : View  {
 //    var title : String
 //    var body : some View{
 //
 //        Text(title)
 //    }
 //    //    .background(Color("Color01"))
 //
 //}//test2
 //定义计时器，停车场开始计时，为收费提供依据
 class TimeHelp {var canceller: AnyCancellable?//每次都新建一个计时器func start(receiveValue: @escaping (() -> Void)) {let timerPublisher = Timer.publish(every: 1, on: .main, in: .common).autoconnect()self.canceller = timerPublisher.sink { date inreceiveValue()}}//暂停销毁计时器func stop() {canceller?.cancel()canceller = nil}
 }//设置时间显示的格式
 extension Date {func formatDate() -> String {let formatter = DateFormatter()//        // 创建一个日期格式器formatter.dateFormat = "yyyy年MM月dd日 HH:mm:ss"//            formatter.dateStyle = .short//            formatter.timeStyle = .mediumlet nowdate = formatter.string(from: Date())return nowdate}
 }#if DEBUG
 struct ContentView_Previews : PreviewProvider {static var previews: some View {ContentView().previewDevice("iPhone 6s Plus 13.3")}
 }
 #endif