【发布时间】:2016-02-22 13:34:41
【问题描述】:
我正在开发一个基于位置的应用程序,它应该总是获取用户位置。我使用标准位置服务。但问题是,即使我们移动到其他位置,应用程序在后台保持空闲一段时间后也不会获取坐标。根据苹果文档,当一个新位置到达时,应用程序应该会自动唤醒,但这里不会发生这种情况。我正在共享代码并用于获取我的 plist 的位置和屏幕截图。
class SALocation: NSObject,CLLocationManagerDelegate
{
static let sharedInstance : SALocation = SALocation()
var locationManager : CLLocationManager!
var location : CLLocation!
var address : String!
var latitude : NSString?
var longitude : NSString?
var isAdderssLoaded : Bool = false
var locdictionary : NSMutableDictionary = NSMutableDictionary()
func startLocationManager()
{
if self.locationManager == nil
{
self.locationManager = CLLocationManager()
if CLLocationManager.locationServicesEnabled(){
print("location service enabled")
}
self.locationManager.delegate = self
self.locationManager.requestWhenInUseAuthorization()
self.locationManager.distanceFilter = kCLDistanceFilterNone
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
if ( Float (UIDevice.currentDevice().systemVersion) >= 9) {
if #available(iOS 9.0, *) {
self.locationManager.allowsBackgroundLocationUpdates = true
} else {
// Fallback on earlier versions
};
}
self.locationManager.startUpdatingLocation()
//self.locationManager.stopMonitoringSignificantLocationChanges()
}
else
{
self.locationManager.startUpdatingLocation()
}
}
// MARK: CLLocationManagerDelegate
func locationManager(manager: CLLocationManager, didFailWithError error: NSError)
{
UIAlertView(title:"Alert", message:error.description, delegate: nil, cancelButtonTitle:nil, otherButtonTitles:"Ok").show()
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
{
if locations.count > 0
{
self.location = locations[0]
/* storing date and location to plist
*/
let datenow = NSDate()
let dateformatternow = NSDateFormatter ()
dateformatternow.dateFormat = "yyyyMMdd HH:mm:ss"
let timenow:NSString = dateformatternow.stringFromDate(datenow)
let documetsdirectorypath = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true).last
latitude = NSString(format: "%f",self.location.coordinate.latitude)
longitude = NSString (format: "%f",self.location.coordinate.longitude)
let latlong : NSString = NSString(format:"%@~%@",latitude!,longitude!)
NSUserDefaults.standardUserDefaults().setObject(latlong, forKey: "latlong")
let aFilePath = NSString(format: "%@/location.plist",documetsdirectorypath!)
locdictionary.setObject(latlong, forKey: timenow as String)
locdictionary.writeToFile(aFilePath as String, atomically: true)
///////////// ||storing date and location to plist code ends here||\\\\\\
// self.getAddressFromLocation(locations[0] )
// if (NSUserDefaults.standardUserDefaults().objectForKey(SettingAppRefresh) != nil)
// {
// if (NSUserDefaults.standardUserDefaults().objectForKey(SettingAppRefresh) as! NSString).isEqualToString(FalseString)
// {
// // self.locationManager.stopUpdatingLocation()
// }
// }
}
}
}
我在这里所做的只是获取位置并将其写入 plist 文件。这适用于前景,背景等。但是当我让应用程序闲置 20 分钟时,即使我在应用程序暂停时移动到其他一些位置,也不会获取位置
【问题讨论】:
标签: ios core-location cllocationmanager background-process