BG处理任务

Question

我试图在我的应用程序中使用BGProcessingTask，当我进行测试时，我的代码只执行一次，但我的任务是像wwdc2019展览中的示例那样运行它。我需要在用户关闭应用程序后，每15分钟这段代码工作并将数据发送到服务器，我做错了什么?

AppDelegate.swift

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: 
    
        [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
         if #available(iOS 13.0, *) {
                    BGTaskScheduler.shared.register(forTaskWithIdentifier: "com.transistorsoft.process", using: nil) { (task) in
                        self.handleBackgroundProcess(task: task as! BGProcessingTask)
                    }
                } else {
                    // Fallback on earlier versions
                }
                return true
        }
         @available(iOS 13.0, *)
            func handleBackgroundProcess(task:BGProcessingTask) {
                schedularProcessTask()
                bgTask(task: task)
            }
        
            
            @available(iOS 13.0, *)
            func bgTask(task:BGProcessingTask) {
                let predicate = NSPredicate(format: "timestamp <%@", NSDate(timeIntervalSinceNow: -24 * 60 * 60))
                
                task.expirationHandler = {
                    BGTaskScheduler.shared.cancelAllTaskRequests()
                }
                
                let location = LocationObj()
                let lat = location.lat ?? 0
                let lon = location.lon ?? 0
                let accuracy = location.accuracy
                var taskId = "123"
                
                let endpoint = CheckTaskGeolocationEndpoint(taskId:taskId, lat: lat, lon: lon, accuracy: accuracy)
                endpoint.apiCall { (result, error) in
                    if error?.success ?? false {
                        if result?.autoExit == true {
                            ReminderNotificationManager.shared.scheduleLocalNotification(tite: "You are not in the polygon",
                                                                                         body: "Task is over")
                            BGTaskScheduler.shared.cancelAllTaskRequests()
                        }else {
                            ReminderNotificationManager.shared.scheduleLocalNotification(tite: "You are in the polygon",
                            
                                                                                         body: "All good")
                            print(predicate)
/// task was complete and wait when task is run again
                            task.setTaskCompleted(success: true)
                        }
                    } else {
/// task was complete and wait when task is run again
                        task.setTaskCompleted(success: true)
                    }
                }
            }

SceneDelegate.swift

func sceneDidEnterBackground(_ scene: UIScene) {
        schedularProcessTask()
    }

@available(iOS 13.0, *)
func schedularProcessTask() {
    let request = BGProcessingTaskRequest(identifier: "com.transistorsoft.process")
    request.earliestBeginDate = Date(timeIntervalSinceNow: 15 * 60)
    request.requiresNetworkConnectivity = true
    do {
        try BGTaskScheduler.shared.submit(request)
        
    }catch {
        print("Could not schedule app refresh \(error)")
    }
}

Answer 1

您可能需要的工具是startMonitoring(for:)，用于监视区域内的某个区域。你不能在某个时间间隔可靠地启动你的应用程序，如果你这样做了，这将是非常糟糕的电池寿命。但是区域监控是电池高效的，一般情况下，操作系统会在需要的时候启动你。

您可以探索的其他工具包括startMonitoringSignificantLocationChanges、push通知和iBeacons。但对于这一特殊问题，区域监测可能是最有效的。