我创建了一个位置跟踪ios应用程序（使用CocoaLumberjack库编写日志文件。因此，启用了后台位置更新并可以进行我的测试（我在后台运行了将近8个小时）。当应用程序上线时。我们的应用程序发生了很多问题。当应用程序转到后台时，位置跟踪无法正常运行。一段时间未将用户位置发送到服务器。所以我从客户端获取日志文件，并查看日志文件中存在时间间隔。我经常获取用户位置（每隔一秒钟）。所以我认为应用程序在日志文件中出现间隙时进入了暂停状态？为什么即使我经常在后台找到应用，应用也会进入暂停状态？应用程式会进入暂停状态吗？搜索的批次找不到任何有效的详细信息？
func startTimer()
{
if bgTimer == nil
{
bgTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(self.startLocationChanges), userInfo: nil, repeats: true)
}
}
func stopTimer()
{
if bgTimer != nil
{
bgTimer?.invalidate()
bgTimer = nil
}
}
@objc func startLocationChanges() {
locationManager.delegate = self
locationManager.allowsBackgroundLocationUpdates = true
locationManager.pausesLocationUpdatesAutomatically = false
locationManager.desiredAccuracy = kCLLocationAccuracyThreeKilometers
locationManager.requestAlwaysAuthorization()
locationManager.startUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
//let lastLocation = locations.last!
// Do something with the location.
/*print(lastLocation)
let logInfo = "BGLocationManager didUpdateLocations : " + "\(lastLocation)"
AppDelegate.appDelegate().writeLoggerStatement(strInfo: logInfo)*/
locationManager.stopUpdatingLocation()
}
func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
if let error = error as? CLError, error.code == .denied {
// Location updates are not authorized.
manager.stopMonitoringSignificantLocationChanges()
return
}
// Notify the user of any errors.
}
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 applicationDidEnterBackground: when the user quits.
self.writeLoggerStatement(strInfo: "applicationDidEnterBackground")
appstate = "Background"
if CoreDataUtils.isUserLoggedIn(entityName: "UserInfo") == true {
let user = CoreDataUtils.fetchCurrentUser(entityName: "UserInfo")
if user!.isGPSActive == "1"
{
if backgroundTaskIdentifier != nil
{
application.endBackgroundTask(backgroundTaskIdentifier!)
backgroundTaskIdentifier = UIBackgroundTaskInvalid
}
backgroundTaskIdentifier = application.beginBackgroundTask(expirationHandler: {
//UIApplication.shared.endBackgroundTask(self.backgroundTaskIdentifier!)
})
BGLocationManager.shared.startTimer()
let logInfo = String(format:"applicationDidEnterBackground backgroundTimeRemaining : %f",(Double)(application.backgroundTimeRemaining / 60))
self.writeLoggerStatement(strInfo: logInfo)
}
}
}