[移动开发]SwiftUI UsersNotification发送本地通知

环境配置：VMware+iOS 14.5+Xcode 12+SwiftUI
记录一下SwiftUI发送通知的代码（因为项目的原因所以没放全部的代码，意会一下

因为在建立项目的时候Life Cycle选的是swiftui app，所以项目中没有AppDelegate.swift文件，需要自己新建一个

//
//  AppDelegate.swift
//  
//
//  Created by 拔牙不打麻药 on 2021/10/16.
//

import Foundation
import UIKit
import UserNotifications

class AppDelegate: NSObject, UIApplicationDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
        UNUserNotificationCenter.current().requestAuthorization(options: [.alert,.badge,.sound], completionHandler: {(success, error) in
            if success{
                print("success")
            }
            if error != nil{
                print("error")
            }
        })
        return true
    }
}

extension AppDelegate: UNUserNotificationCenterDelegate {

    
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
            clearBadge()
            guard let trigger = notification.request.trigger else { return; }
            receiveNotification(flag: "willPresent", trigger: trigger)
        }
        
        func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
            clearBadge()
            guard let trigger = response.notification.request.trigger else { return; }
            receiveNotification(flag: "did receive", trigger: trigger)
        }
        
        func receiveNotification(flag: String, trigger: UNNotificationTrigger) {
            if trigger.isKind(of: UNTimeIntervalNotificationTrigger.classForCoder()) {
                print("Notification \(flag), Is class UNTimeIntervalNotificationTrigger")
            } else if trigger.isKind(of: UNCalendarNotificationTrigger.classForCoder()) {
                print("Notification \(flag), Is class UNCalendarNotificationTrigger")
            }
        }
        
        func clearBadge() {
            UIApplication.shared.applicationIconBadgeNumber = 0
        }
}

然后需要在App.swift文件里修改一下（不同项目swift文件名不同，需要找一下，主要改的是有@的那句

//
//  App.swift
//  
//
//  Created by 拔牙不打麻药 on 2021/9/17.
//

import SwiftUI
import UIKit
import UserNotifications


@main
struct App: App {
    
    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
    
    var body: some Scene {
        WindowGroup {
           ContentView()
        }
    }
}

然后是NotificationFunc.swift用来放发送通知和撤回通知的函数（撤回通知的函数没用上，酌情使用

//
//  NotificationFunc.swift
//  
//
//  Created by 拔牙不打麻药 on 2021/10/15.
//

import Foundation
import UserNotifications

let NotificationContent = UNMutableNotificationContent()

//发送通知的函数
func sendNotification(){
    NotificationContent.title = "testContent"
    NotificationContent.body = "test"
    NotificationContent.sound = UNNotificationSound.default
    NotificationContent.badge = 1 //这个是app分布页上的红标，强迫症必备
    var matchingDate = DateComponents()
    matchingDate.hour = 19
    matchingDate.minute = 52 //这里是指定了时间到了19:52就会发送通知
    print("matchingDate:\(matchingDate)")
    let trigger = UNCalendarNotificationTrigger(dateMatching: matchingDate, repeats: true)
    let request = UNNotificationRequest(identifier: NotificationContent.title + matchingDate.description, content: NotificationContent, trigger: trigger)

    UNUserNotificationCenter.current().add(request) { err in
        err != nil ? print("添加本地通知错误", err!.localizedDescription) : print("添加本地通知成功")
    }
}

//撤回通知的函数
func widthdrawNotification(clockset:ClockSet){
    let timeNotification = string2Date(clockset.content)
    UNUserNotificationCenter.current().removeDeliveredNotifications(withIdentifiers: [clockset.content + timeNotification.description])
    UNUserNotificationCenter.current().removePendingNotificationRequests(withIdentifiers: [clockset.content + timeNotification.description])
}

最后是发送通知UI界面，这里没写全，意会一下

//NotificationShowPage.swift
Text("发送通知")
.onAppear(){                       UNUserNotificationCenter.current().requestAuthorization(options: [.alert,.badge,.sound]){_,_ in
                          
         sendNotification()  
                                }
                            }

这样就可以发送通知了！
不过我在虚拟机上运行的时候发送的挺慢的，几乎要等设定时间的下一分钟才发过来，想要见效快的可以试试改一下NotificationFunc.swift，蓝色线的代码删除，红色字代码替换，红色字代码的意思是每一分钟的第五秒就会发送通知。