AINOrderViewController.m

- (IBAction)obtainCoordinates:(UIButton *)sender {
	sender.enabled = NO;

	[CLLocationManager promise].then(^(CLLocation *location) {
		self.fromTextField.text = [NSString stringWithFormat:@"GPS: %f,%f", location.coordinate.latitude, location.coordinate.longitude];
	}).catch(^(NSError *error) {
		[self presentGPSError:error];
	}).finally(^{
		sender.enabled = YES;
	});
}

- (void)presentGPSError:(NSError *)error {
	if (error.code == 1) {
		[self presentViewController:[AINContext current].settingsAlertController animated:YES completion:nil];
	} else {
		UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Chyba GPS" message:@"Nepodařilo se zjistit současnou polohu, zkuste to prosím později." preferredStyle:UIAlertControllerStyleAlert];

		[alertController addAction:[UIAlertAction actionWithTitle:@"Rozumím" style:UIAlertActionStyleCancel handler:nil]];
		[self presentViewController:alertController animated:YES completion:nil];
	}
}