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+ (BOOL)isLocationUpdatesAvailable
{
    CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
    
    if ([CLLocationManager instancesRespondToSelector:@selector(requestWhenInUseAuthorization)]) {
        NSString *alwaysDescription = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"NSLocationAlwaysUsageDescription"];
        NSString *whenInUseDescription = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"NSLocationWhenInUseUsageDescription"];
        NSAssert([alwaysDescription length] || [whenInUseDescription length], @"NSLocationAlwaysUsageDescription or NSLocationWhenInUseUsageDescription key not present in the info.plist. Please add it in order to recieve location updates");
    }
    
#if defined(__IPHONE_OS_VERSION_MAX_ALLOWED) && __IPHONE_OS_VERSION_MAX_ALLOWED >= 80000
    switch (status) {
        case kCLAuthorizationStatusAuthorizedAlways:
        case kCLAuthorizationStatusAuthorizedWhenInUse:
        case kCLAuthorizationStatusNotDetermined:
            return YES;
            break;
        case kCLAuthorizationStatusDenied:
        case kCLAuthorizationStatusRestricted:
        default:
            return NO;
            break;
    }
#else
    switch (status) {
        case kCLAuthorizationStatusAuthorized:
        case kCLAuthorizationStatusNotDetermined:
            return YES;
            break;
        case kCLAuthorizationStatusDenied:
        case kCLAuthorizationStatusRestricted:
        default:
            return NO;
            break;
    }
#endif
}
https://github.com/axldyb/CLLocationManager-blocks