请帮助我，当我的应用处于后台模式时，我正在尝试将我当前的应用位置发送到服务器。
但经过一段时间后，位置更新方法停止以获取当前位置。
- (void)startLocationTracking
{
NSLog(@"startLocationTracking");
if ([CLLocationManager locationServicesEnabled] == NO)
{
NSLog(@"locationServicesEnabled false");
UIAlertView *servicesDisabledAlert = [[UIAlertView alloc] initWithTitle:@"Location Services Disabled" message:@"You currently have all location services for this device disabled" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[servicesDisabledAlert show];
} else
{
CLAuthorizationStatus authorizationStatus= [CLLocationManager authorizationStatus];
if(authorizationStatus == kCLAuthorizationStatusDenied || authorizationStatus == kCLAuthorizationStatusRestricted){
NSLog(@"authorizationStatus failed");
} else {
NSLog(@"authorizationStatus authorized");
CLLocationManager *locationManager = [LocationTracker sharedLocationManager];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
locationManager.distanceFilter = kCLDistanceFilterNone;
if(IS_OS_8_OR_LATER) {
[locationManager requestAlwaysAuthorization];
}
[locationManager startUpdatingLocation];
[locationManager startMonitoringSignificantLocationChanges];
}
}
}
- (void)stopLocationTracking {
NSLog(@"stopLocationTracking");
if (self.shareModel.timer) {
[self.shareModel.timer invalidate];
self.shareModel.timer = nil;
}
CLLocationManager *locationManager = [LocationTracker sharedLocationManager];
[locationManager stopUpdatingLocation];
[locationManager stopMonitoringSignificantLocationChanges];
}
#pragma mark - CLLocationManagerDelegate Methods
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
NSLog(@"locationManager didUpdateLocations");
for(int i=0;i<locations.count;i++){
CLLocation * newLocation = [locations objectAtIndex:i];
CLLocationCoordinate2D theLocation = newLocation.coordinate;
CLLocationAccuracy theAccuracy = newLocation.horizontalAccuracy;
NSTimeInterval locationAge = -[newLocation.timestamp timeIntervalSinceNow];
if (locationAge > 30.0)
{
continue;
}
//Select only valid location and also location with good accuracy
if(newLocation!=nil&&theAccuracy>0
&&theAccuracy<2000
&&(!(theLocation.latitude==0.0&&theLocation.longitude==0.0))){
self.myLastLocation = theLocation;
self.myLastLocationAccuracy= theAccuracy;
NSMutableDictionary * dict = [[NSMutableDictionary alloc]init];
[dict setObject:[NSNumber numberWithFloat:theLocation.latitude] forKey:@"latitude"];
[dict setObject:[NSNumber numberWithFloat:theLocation.longitude] forKey:@"longitude"];
[dict setObject:[NSNumber numberWithFloat:theAccuracy] forKey:@"theAccuracy"];
//Add the vallid location with good accuracy into an array
//Every 1 minute, I will select the best location based on accuracy and send to server
[self.shareModel.myLocationArray addObject:dict];
}
}
//If the timer still valid, return it (Will not run the code below)
if (self.shareModel.timer) {
return;
}
self.shareModel.bgTask = [BackgroundTaskManager sharedBackgroundTaskManager];
[self.shareModel.bgTask beginNewBackgroundTask];
//Restart the locationMaanger after 1 minute
self.shareModel.timer = [NSTimer scheduledTimerWithTimeInterval:60 target:self
selector:@selector(restartLocationUpdates)
userInfo:nil
repeats:NO];
//Will only stop the locationManager after 10 seconds, so that we can get some accurate locations
//The location manager will only operate for 10 seconds to save battery
if (self.shareModel.delay10Seconds) {
[self.shareModel.delay10Seconds invalidate];
self.shareModel.delay10Seconds = nil;
}
self.shareModel.delay10Seconds = [NSTimer scheduledTimerWithTimeInterval:10 target:self
selector:@selector(stopLocationDelayBy10Seconds)
userInfo:nil
repeats:NO];
}
//Stop the locationManager
-(void)stopLocationDelayBy10Seconds{
CLLocationManager *locationManager = [LocationTracker sharedLocationManager];
[locationManager stopUpdatingLocation];
[locationManager stopMonitoringSignificantLocationChanges];
NSLog(@"locationManager stop Updating after 10 seconds");
}
- (void)locationManager: (CLLocationManager *)manager didFailWithError: (NSError *)error
{
NSLog(@"locationManager error:%@",error);
}
//Send the location to Server
- (void)updateLocationToServer {
NSLog(@"updateLocationToServer");
// Find the best location from the array based on accuracy
NSMutableDictionary * myBestLocation = [[NSMutableDictionary alloc]init];
for(int i=0;i<self.shareModel.myLocationArray.count;i++){
NSMutableDictionary * currentLocation = [self.shareModel.myLocationArray objectAtIndex:i];
if(i==0)
myBestLocation = currentLocation;
else{
if([[currentLocation objectForKey:ACCURACY]floatValue]<=[[myBestLocation objectForKey:ACCURACY]floatValue]){
myBestLocation = currentLocation;
}
}
}
NSLog(@"My Best location:%@",myBestLocation);
//If the array is 0, get the last location
//Sometimes due to network issue or unknown reason, you could not get the location during that period, the best you can do is sending the last known location to the server
if(self.shareModel.myLocationArray.count==0)
{
NSLog(@"Unable to get location, use the last known location");
self.myLocation=self.myLastLocation;
self.myLocationAccuracy=self.myLastLocationAccuracy;
}else{
CLLocationCoordinate2D theBestLocation;
theBestLocation.latitude =[[myBestLocation objectForKey:LATITUDE]floatValue];
theBestLocation.longitude =[[myBestLocation objectForKey:LONGITUDE]floatValue];
self.myLocation=theBestLocation;
self.myLocationAccuracy =[[myBestLocation objectForKey:ACCURACY]floatValue];
}
[self getUpdateLocation];
NSLog(@"Send to Server: Latitude(%f) Longitude(%f) Accuracy(%f)",self.myLocation.latitude, self.myLocation.longitude,self.myLocationAccuracy);
//TODO: Your code to send the self.myLocation and self.myLocationAccuracy to your server
//After sending the location to the server successful, remember to clear the current array with the following code. It is to make sure that you clear up old location in the array and add the new locations from locationManager
[self.shareModel.myLocationArray removeAllObjects];
self.shareModel.myLocationArray = nil;
self.shareModel.myLocationArray = [[NSMutableArray alloc]init];
}
-(void)getUpdateLocation
{
NSUserDefaults *currentDefaults = [NSUserDefaults standardUserDefaults];
dataMobile = [currentDefaults valueForKey:@"mobile"];
dataCode = [currentDefaults valueForKey:@"code"];
strMobile = [self getDecryptionMobile];
strCode = [self getDecryptionCode];
strToken = [NSString stringWithFormat:@"%@%@%@",@"Apple",strMobile,strCode];
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
NSDictionary *params = @ {@"function" :@"map/location/insert",@"childIdEnc":[currentDefaults valueForKey:@"childIdEnc"], @"phoneId" : [currentDefaults valueForKey:@"phoneId"], @"latitude": [NSString stringWithFormat:@"%f",self.myLocation.latitude], @"longitude": [NSString stringWithFormat:@"%f",self.myLocation.longitude]};
NSLog(@"params %@",params);
[manager POST:@"https://api.familyconnect.net/call/?debug=1" parameters:params
success:^(AFHTTPRequestOperation *operation, id responseObject)
{
NSDictionary *jsonList = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];
NSLog(@"JSON: %@", jsonList);
}
failure:
^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(@"Error: %@", error);
}];
}
我在我的应用中使用了后台获取和位置更新。也可以从settings-＆gt;功能开启它。
但是当我从xcode调试并在后台获取应用程序然后它正常工作但是当我断开连接并测试它然后它停止更新我的位置。
请帮帮我们。
答案 0 :(得分：0)
您似乎正在使用受此示例启发的代码https://github.com/voyage11/Location
但是此示例在10秒后停止位置更新以节省电池寿命。看到这个评论
//Will only stop the locationManager after 10 seconds, so that we can get some accurate locations
//The location manager will only operate for 10 seconds to save battery
但如果配置正确，locationtracker还会创建一个计时器，以便在60秒内再次启动位置更新。
基本上它会收集位置更新10秒，过滤掉最好的。 60秒后，位置更新再次开始。在上面的链接中，请参阅LocationAppDelegate来电
//Send the best location to server every 60 seconds
//You may adjust the time interval depends on the need of your app.
NSTimeInterval time = 60.0;
self.locationUpdateTimer =
[NSTimer scheduledTimerWithTimeInterval:time
target:self
selector:@selector(updateLocation)
userInfo:nil
repeats:YES];
此计时器会导致位置更新“重新启动”。