【发布时间】：2016-12-26 10:59:16
【问题描述】：
关于swift语言的位置更新，我有几个问题要问。
让我解释一下我在应用程序中所做的事情。我正在开发一个应用程序，它会定期监控用户的位置（就像你们所有人一样）并将其更新到服务器，以便跟踪并保存用户的移动以供用户将来参考。
问题
-
使用 startMonitoringSignificantLocationChanges 与 startUpdatingLocation 有什么区别？
1.1 如果我们使用 startUpdatingLocation，它是否影响发布应用到 App Store？
-
当应用被杀死/暂停（强制关闭被用户）时，从 AppDelegate 需要 一些时间来重新启动位置管理器这会导致在一段时间内丢失位置数据。有什么可能的解决方案来克服这个问题？
2.1 重启的时间差在30秒到近1分钟左右，不会触发位置更新，因此路线并不完美如图在图片
应用程序的输出，由于重新启动，位置未收到，因此路线越过道路。
参考代码
import UIKit
import GoogleMaps
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, CLLocationManagerDelegate {
var window: UIWindow?
let DBName = "test"
var logFile: FileUtils?
var viewController:ViewController?
var count = 0
var appOpenCount = 0
let totalPath = GMSMutablePath()
var leaveCoordinates = 0
var previousLocation: CLLocationCoordinate2D = CLLocationCoordinate2D(latitude: 0, longitude: 0)
var locationManager: CLLocationManager?
var significatLocationManager : CLLocationManager?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
GMSServices.provideAPIKey("*********************")
logFile = FileUtils(fileName: "\(DBName).txt")
logFile!.appendFile("\n\nlaunchOptions : \(launchOptions)")
let defaults = NSUserDefaults.standardUserDefaults()
count = defaults.integerForKey("Enabled")
appOpenCount = defaults.integerForKey("appOpenCount")
if(UIApplication.sharedApplication().backgroundRefreshStatus == UIBackgroundRefreshStatus.Available){
logFile!.appendFile("\nYessss")
} else {
logFile!.appendFile("\nNooo")
}
appOpenCount += 1
defaults.setValue(appOpenCount, forKey: "appOpenCount")
defaults.synchronize()
if count == 0 {
count += 1
defaults.setValue(count, forKey: "Enabled")
defaults.synchronize()
Util.copyFile(count)
}
if let launchOpt = launchOptions{
if (launchOpt[UIApplicationLaunchOptionsLocationKey] != nil) {
logFile!.appendFile("\nExecuted on : significatLocationManager")
self.significatLocationManager = CLLocationManager()
self.significatLocationManager?.desiredAccuracy = kCLLocationAccuracyBest
self.significatLocationManager?.delegate = self
self.significatLocationManager?.requestAlwaysAuthorization()
if #available(iOS 9.0, *) {
self.significatLocationManager!.allowsBackgroundLocationUpdates = true
}
self.significatLocationManager?.startUpdatingLocation()
}else{
logFile!.appendFile("\nExecuted on : locationManager1")
self.locationManager = CLLocationManager()
self.locationManager?.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager?.delegate = self
self.locationManager?.requestAlwaysAuthorization()
if #available(iOS 9.0, *) {
self.locationManager!.allowsBackgroundLocationUpdates = true
}
self.locationManager?.startUpdatingLocation()
}
} else {
logFile!.appendFile("\nExecuted on : locationManager2")
self.locationManager = CLLocationManager()
self.locationManager?.desiredAccuracy = kCLLocationAccuracyBest
self.locationManager?.delegate = self
self.locationManager?.requestAlwaysAuthorization()
if #available(iOS 9.0, *) {
self.locationManager!.allowsBackgroundLocationUpdates = true
}
self.locationManager?.startUpdatingLocation()
}
return true
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]){
let locationArray = locations as NSArray
let newLocation = locationArray.lastObject as! CLLocation
let coordinate = newLocation.coordinate
let tempCoor = CLLocationCoordinate2D(latitude: coordinate.latitude, longitude: coordinate.longitude)
let lat = tempCoor.latitude
let lon = tempCoor.longitude
insert(lat, lon: lon)
}
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 throttle down OpenGL ES frame rates. 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.
if self.significatLocationManager != nil {
self.significatLocationManager?.startMonitoringSignificantLocationChanges()
}else{
self.locationManager?.startMonitoringSignificantLocationChanges()
}
logFile!.appendFile("\napplicationDidEnterBackground")
}
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:.
}
func insert(lat: Double, lon: Double){
let locationInfo: LocationDetails = LocationDetails()
locationInfo.latitude = lat
locationInfo.longitude = lon
locationInfo.time = NSDate()
let db = "\(DBName)\(count).sqlite"
ModelManager.getInstance(db).addLocationData(locationInfo)
}
}
【问题讨论】：
标签： ios swift location core-location