Try this code. To keep the application as simple as possible, never take the Core data code out of the main thread i.e. any thing related to self.managedObjectContext such as save or executing fetch requests. It is because Core data is not thread safe and you will have to device a strategy to handle that. I am assuming that your application is straight forward and you don't need such a strategy. So, please try to keep it as simple as possible and always perform the core data operations (save, execute) on main thread. dispatch_async(dispatch_get_main_queue(), ^{ code });
will execute it on main thread.
-(void) updateFacebookFriendsHighScore
{
dispatch_async(dispatch_get_main_queue(), ^{
NSFetchRequest *requestche =[NSFetchRequest fetchRequestWithEntityName:@"Time"];
[requestche setReturnsObjectsAsFaults:NO];
NSPredicate *predicate=[NSPredicate predicateWithFormat:@"timeid==1"];
requestche.predicate=predicate;
NSArray *getIDTime = [self.managedObjectContext executeFetchRequest:requestche error:nil];
NSString *getTheTime = [[getIDTime valueForKey:@"time"] componentsJoinedByString:@""];
NSNumber *timeInInt = [NSNumber numberWithInteger: [getTheTime intValue]];
int timeFromDB = [timeInInt intValue];
timeFromDB = timeFromDB + 509;
int timeNow = [[NSDate date] timeIntervalSince1970];
if(timeNow > timeFromDB){
NSFetchRequest *updateHighScoreRequest = [NSFetchRequest fetchRequestWithEntityName:@"Friends"];
[updateHighScoreRequest setReturnsObjectsAsFaults:NO];
NSArray *friendsToUpdate = [self.managedObjectContext executeFetchRequest:updateHighScoreRequest error:nil];
for(NSArray *friendId in friendsToUpdate){
NSString *getFriendId = [friendId valueForKey:@"fbid"] ;
NSString *siteURL = [NSString stringWithFormat:@"http://www.example.com/example.php?fbid=%@", getFriendId];
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:siteURL]];
[NSURLConnection sendAsynchronousRequest:urlRequest queue:[[NSOperationQueue alloc] init] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
NSString *resultsFromDB = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSNumber *theScoreForUpdate = [NSNumber numberWithInt:[resultsFromDB intValue]];
NSFetchRequest *updateTheHighScoreRequest = [NSFetchRequest fetchRequestWithEntityName:@"Friends"];
NSPredicate *updateTheHighScorePredicate = [NSPredicate predicateWithFormat:@"fbid==%@",getFriendId];
updateTheHighScoreRequest.predicate=updateTheHighScorePredicate;
Friends *setScore = [[self.managedObjectContext executeFetchRequest:updateTheHighScoreRequest error:nil] lastObject];
NSLog(@"%@", setScore);
[setScore setValue:theScoreForUpdate forKey:@"score"];
[self.managedObjectContext save:nil];
data = nil;
resultsFromDB = nil;
theScoreForUpdate = nil;
setScore = nil;
}];
updateHighScoreRequest = nil;
}
}
requestche = nil;
});
}