Why NSURLConnection didReceiveData not be called in background location update - ios

Question

Please help me, I am coding iOS with background location update and send location data to my server.
below is my code:
#import "AppDelegate.h"
#implementation AppDelegate
- (void)applicationDidEnterBackground:(UIApplication *)application
{
NSLog(#"Went to Background");
[locationManager startMonitoringSignificantLocationChanges];
[locationManager startUpdatingLocation];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
UIApplication *app = [UIApplication sharedApplication];
__block UIBackgroundTaskIdentifier locationUpdateTaskID = [app beginBackgroundTaskWithExpirationHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
if (locationUpdateTaskID != UIBackgroundTaskInvalid) {
[app endBackgroundTask:locationUpdateTaskID];
locationUpdateTaskID = UIBackgroundTaskInvalid;
}
});
}];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
if ([[locations lastObject] horizontalAccuracy] < 100.0f) {
NSUserDefaults *userDefaults=[NSUserDefaults standardUserDefaults];
mytoken=[userDefaults stringForKey:#"mytoken"];
if (mytoken==nil) {
mytoken=#"";
}
mybgtype=[userDefaults stringForKey:#"mybgtype"];
if (mybgtype==nil) {
mybgtype=#"all";
[userDefaults setObject:mybgtype forKey:#"mybgtype"];
[userDefaults synchronize];
}
CLLocation *newLocation = [locations lastObject];
CLLocation *oldLocation;
if (locations.count > 1) {
oldLocation = [locations objectAtIndex:locations.count-2];
} else {
oldLocation = nil;
}
NSString *NowLng=[[NSNumber numberWithFloat:newLocation.coordinate.longitude] stringValue];
NSString *NowLat=[[NSNumber numberWithFloat:newLocation.coordinate.latitude] stringValue];
UILocalNotification *scheduleAlert;
[[UIApplication sharedApplication] cancelAllLocalNotifications];
scheduleAlert=[[UILocalNotification alloc] init];
scheduleAlert.applicationIconBadgeNumber=1;
scheduleAlert.fireDate=[NSDate dateWithTimeIntervalSinceNow:1];
scheduleAlert.timeZone=[NSTimeZone defaultTimeZone];
scheduleAlert.repeatInterval=NSDayCalendarUnit;
scheduleAlert.soundName=UILocalNotificationDefaultSoundName;
scheduleAlert.alertBody=NowLat;
[[UIApplication sharedApplication] scheduleLocalNotification:scheduleAlert];
if ([mybgtype isEqualToString:#"n"]) {
} else {
[self LoadTaskMyBg:newLocation];
}
}
dispatch_async(dispatch_get_main_queue(), ^{
if (locationUpdateTaskID != UIBackgroundTaskInvalid) {
[app endBackgroundTask:locationUpdateTaskID];
locationUpdateTaskID = UIBackgroundTaskInvalid;
}
});
});
}
-(void) LoadTaskMyBg:(CLLocation *)newLocation
{
NSString *mylat = [NSString stringWithFormat:#"%.8f", newLocation.coordinate.latitude];
NSString *mylng = [NSString stringWithFormat:#"%.8f", newLocation.coordinate.longitude];
NSLog(#"task 1");
receivedDataMyBg=[[NSMutableData alloc] initWithLength:0];
NSString * urlString;
urlString = #"https://www.xx.xx/xx.cshtml";
NSURL * url = [NSURL URLWithString:urlString];
NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:15.0];
[request setHTTPMethod:#"POST"];
NSString *parameterString=[NSString stringWithFormat:#"%#%#%#%#%#%#%#%#", #"pp=a&tt=",#"aa",#"&mylat=",mylat,#"&mylng=",mylng,#"&myalt=",#"0"];
NSData * postData = [parameterString dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:postData];
connMyBg = [[NSURLConnection alloc] initWithRequest:request delegate:self];
NSLog(#"task 1a");
NSLog(#"%#",parameterString);
if (connMyBg==nil) {
NSLog(#"task 1e");
return;
}
}
- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace{
return YES;
}
- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge{
//NSLog(#"received authen challenge");
NSLog(#"task challenge");
[challenge.sender useCredential:[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust] forAuthenticationChallenge:challenge];
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
if (connection==connMyBg) {
[receivedDataMyBg setLength:0];
NSLog(#"task connect receive");
}
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
//NSLog(#"got data %#", [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease]);
if (connection==connMyBg) {
[receivedDataMyBg appendData:data];
}
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
NSLog(#"error");
if (connection==connMyBg) {
}
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
if (connection==connMyBg) {
NSLog(#"task 2");
NSString *response;
NSError *error;
response=[[NSString alloc] initWithData:receivedDataMyBg encoding:NSUTF8StringEncoding];
NSData* data = [response dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *JSONDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&error];
if([[JSONDic objectForKey:#"bnum"] isEqualToString:#""])
{
} else {
UILocalNotification *scheduleAlert;
[[UIApplication sharedApplication] cancelAllLocalNotifications];
scheduleAlert=[[UILocalNotification alloc] init];
scheduleAlert.applicationIconBadgeNumber=1;
scheduleAlert.fireDate=[NSDate dateWithTimeIntervalSinceNow:1];
scheduleAlert.timeZone=[NSTimeZone defaultTimeZone];
scheduleAlert.repeatInterval=NSDayCalendarUnit;
scheduleAlert.soundName=UILocalNotificationDefaultSoundName;
scheduleAlert.alertBody=#"TEST:OK";
}
NSLog(#"%#",[JSONDic objectForKey:#"bnum"]);
}
}
#end
I can get log: "task 1a" ! but why I can't receive "task connect receive" ????
What should I do ?
Thanks.

Answer 1

To use a delegate for either NSURLConnection or CLLocationManager you'll need to create them as properties with a strong reference. Otherwise the delegate implementation will not get called. Since you did not provide the part where you declared those that may be the problem.

Answer 2

NSString* pp =[NSString stringWithFormat:#"xxxx.xx/xx.cshtml, newLocation.coordinate.latitude, newLocation.coordinate.longitude,0.0];
NSURL* response =[NSURL URLWithString:pp];
NSString* response_str =[NSString stringWithContentsOfURL:response encoding:NSUTF8StringEncoding error:nil];
NSLog(#"%#, response of report=%#", pp, response_str);
If I rewrite the code in didUpdateLocations as above,
I can get response_str and it is correct!
But question is: How can it pass ssl https without be challenged ??
even if it ready work very well!