How to Prompt the User to Turn on Location Services After User Has Denied Their Use

How can I prompt the user to turn on location services after user has denied their use

With iOS8, you can finally link user to Settings app via openURL. For example, you can create a UIAlertView with a single button that takes user to the Settings app:

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:ICLocalizedString(@"LocationServicesPermissionTitle")
                                                    message:ICLocalizedString(@"LocationPermissionGeoFenceMessage")
                                                   delegate:self
                                          cancelButtonTitle:@"Settings"
                                          otherButtonTitles:nil];
    [alert show];

In your UIAlertView delegate:

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
    [alertView dismissWithClickedButtonIndex:buttonIndex animated:YES];
    [[UIApplication sharedApplication] openURL: [NSURL URLWithString: UIApplicationOpenSettingsURLString]];
}

Request permissions again after user denies location services?

The OS will only ever prompt the user once. If they deny permission, that's it. What you can do is direct the user to the Settings for your app by passing UIApplicationOpenSettingsURLString to UIApplication's openURL: method. From there, they can re-enable location services if they wish. That said, you probably shouldn't be too aggressive about bugging them for the permission.

how to request the user to turn on location services

You can check the for locationServicesEnabled and if the location service is allowed for your application by this code:

if([CLLocationManager locationServicesEnabled] && [CLLocationManager authorizationStatus] != kCLAuthorizationStatusDenied) {
    //do your works
} else {
   //show an alert
}

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