ios - 我想一直运行服务即使应用程序在 Swift IOS 中关闭、终止或终止

Question

这是我想一直运行的示例代码服务

internal func backService()
    {
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), { () -> Void in
            let anObject = try! Realm().objects(remindertbl).filter("status = 0")
            print("here")
            for loop in anObject
            {
                let dateFormatter = NSDateFormatter()
                dateFormatter.dateFormat = "dd/MM/yyyy hh:mm a"
                let  timestamp = dateFormatter.stringFromDate(NSDate())
                let timeStampint = dateFormatter.dateFromString(timestamp)!.timeIntervalSince1970
                if(loop.reminderdays == Int64(timeStampint))
                {
                    if(loop.status == 0){                            

                    let notification = UILocalNotification()
                    notification.fireDate = NSDate(timeIntervalSince1970: 0)
                    notification.alertBody = "\(loop.title)"
                    notification.alertAction = "swipe to opem VLB Cloud!"
                    notification.soundName = UILocalNotificationDefaultSoundName
                    notification.userInfo = ["CustomField1": "w00t"]
                    UIApplication.sharedApplication().scheduleLocalNotification(notification)

                    let updateObject = try! Realm().objects(remindertbl).filter("status = 0")
                    var reminderObject = remindertbl()
                    for updateStatus in updateObject{
                        try! Realm().write()
                            {
                                print("target")
                                reminderObject.status = 2
                                reminderObject.reminderId = updateStatus.reminderId
                                reminderObject.syncflag = updateStatus.syncflag
                                reminderObject.vehicleid = updateStatus.vehicleid
                                reminderObject.syncid = updateStatus.syncid
                                reminderObject.dateadded = updateStatus.dateadded
                                reminderObject.datemodified = Int64(Timestamp)!
                                reminderObject.remindertime = updateStatus.remindertime
                                reminderObject.reminerDate = updateStatus.reminerDate
                                reminderObject.reminderdays = updateStatus.reminderdays
                                reminderObject.title = updateStatus.title
                                reminderObject.targetdistance = updateStatus.targetdistance
                                reminderObject.currentdistance = updateStatus.currentdistance
                                reminderObject.remindertype = updateStatus.remindertype

                                reminderObject.synctype = updateStatus.synctype
                                reminderObject.recuringdays = updateStatus.recuringdays
                                reminderObject.recuringdistance = updateStatus.recuringdistance

                                try! Realm().add(reminderObject, update: true)
                                reminderObject = remindertbl()
                        }
                    }
                }
            }
        }

    })
}

Answer 1

由于多种原因，您所问的是不可能的:

1. 根据定义，已终止或终止的任务/应用程序不能运行一些代码
2. Apple 在 iOS 上授权了一些背景模式设备，如果您不是特定任务(例如 voIP)，您的应用程序将不会被操作系统授权在任何时候运行

如果你想了解更多关于在iOS后台执行一些任务，我建议你阅读官方文档:Apple Documentation或 Ray Wenderlich 团队的教程:Background modes for iOS