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

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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]];
}

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