如何让iOS应用在Swift中每隔一分钟在后台运行?

本文介绍了如何让iOS应用在Swift中每隔一分钟在后台运行?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想制作一个可以定期向网站发出HTTP请求的应用.该应用程序必须在后台运行，但可以唤醒或显示通知，具体取决于请求的响应.就像WhatsApp的消息一样，但我没有网络服务器，只有设备会检查http get请求的值.

I want to make an app that makes HTTP request to a website periodically. The app has to run in the background, but can wake up or show a notification, depending on a response of request. Like a message of WhatsApp, but I don't have a webserver, only the device check values of the http get request.

推荐答案

可以使用无提示推送通知，您可以使用此答案.

It's Possible using Silent Push notifications ,you can this answer.

import Firebase import UserNotifications @UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate { var window: UIWindow? var dataManager = DataManager() var reloadSign = false; let gcmMessageIDKey = "gcm.message_id" func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { Fabric.with([Crashlytics.self]) // Override point for customization after application launch. IQKeyboardManager.shared.enable = true DropDown.startListeningToKeyboard() FirebaseApp.configure() Messaging.messaging().delegate = self UNUserNotificationCenter.current().delegate = self as? UNUserNotificationCenterDelegate let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound] // //Solicit permission from user to receive notifications UNUserNotificationCenter.current().requestAuthorization(options: authOptions) { (_, error) in guard error == nil else{ print(error!.localizedDescription) return } } // // //get application instance ID InstanceID.instanceID().instanceID { (result, error) in if let error = error { print("Error fetching remote instance ID: \(error)") } else if let result = result { print("Remote instance ID token: \(result.token)") } } application.registerForRemoteNotifications() return true } func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any]) { if let messageID = userInfo[gcmMessageIDKey] { print("Message ID: \(messageID)") let proj = Project() proj.checkData() } // Print full message. print(userInfo) } func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) { print("Unable to register for remote notifications: \(error.localizedDescription)") } func applicationWillResignActive(_ application: UIApplication) { // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state. // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game. } func applicationDidEnterBackground(_ application: UIApplication) { // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits. } func applicationWillEnterForeground(_ application: UIApplication) { // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background. } func applicationDidBecomeActive(_ application: UIApplication) { // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface. } func applicationWillTerminate(_ application: UIApplication) { // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:. let ud = UserDefaults.standard ud.set( true, forKey: "isTerminated"); ud.synchronize() } func crashlyticsDidDetectReport(forLastExecution report: CLSReport, completionHandler: @escaping (Bool) -> Void) { completionHandler(true) } } extension AppDelegate: UNUserNotificationCenterDelegate{ func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) { let userInfo = notification.request.content.userInfo // With swizzling disabled you must let Messaging know about the message, for Analytics // Messaging.messaging().appDidReceiveMessage(userInfo) // Print message ID. if let messageID = userInfo[gcmMessageIDKey] { print("Message ID: \(messageID)") } // Print full message. print(userInfo) // Change this to your preferred presentation option completionHandler([]) } func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) { let userInfo = response.notification.request.content.userInfo // Print message ID. if let messageID = userInfo[gcmMessageIDKey] { print("Message ID: \(messageID)") } // Print full message. print(userInfo) completionHandler() } } extension AppDelegate: MessagingDelegate{ func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String) { print("Firebase registration token: \(fcmToken)") let dataDict:[String: String] = ["token": fcmToken] NotificationCenter.default.post(name: Notification.Name("FCMToken"), object: nil, userInfo: dataDict) // TODO: If necessary send token to application server. // Note: This callback is fired at each app startup and whenever a new token is generated. } func messaging(_ messaging: Messaging, didReceive remoteMessage: MessagingRemoteMessage) { print("Received data message: \(remoteMessage.appData)") } }