iOS UIAlertController

//UIAlertController

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert];

// Create the actions.

UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelButtonTitle style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {

    

}];

UIAlertAction *otherAction = [UIAlertAction actionWithTitle:otherButtonTitle style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {

    RegisterViewController *registerVC = [[RegisterViewController alloc]init];

    [self.navigationController pushViewController:registerVC animated:YES];

    

}];

// Add the actions.

[alertController addAction:cancelAction];

[alertController addAction:otherAction];

[self presentViewController:alertController animated:YES completion:nil];