Alert using UIAlertController (TextField and Two buttons)

text2buttonAlert.m

// Show a text entry alert with two custom buttons.
- (void)showTextEntryAlert {

    NSString *title = NSLocalizedString(@"Short_title", nil);
    NSString *message = NSLocalizedString(@"Message", nil);
    NSString *cancelButtonTitle = NSLocalizedString(@"Cancel", nil);
    NSString *otherButtonTitle = NSLocalizedString(@"OK", nil);
    
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertControllerStyleAlert];
    
    // Add the text field for text entry.
    [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        // If you need to customize the text field, you can do so here.
    }];
    
    // Create the actions.
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelButtonTitle style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
        NSLog(@"The \"Text Entry\" alert's cancel action occured.");
    }];
    
    UIAlertAction *otherAction = [UIAlertAction actionWithTitle:otherButtonTitle style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
        NSLog(@"The \"Text Entry\" alert's other action occured.");
    }];
    
    // Add the actions.
    [alertController addAction:cancelAction];
    [alertController addAction:otherAction];
    
    [self presentViewController:alertController animated:YES completion:nil];

}

Credit: https://jayprakashdubey.blogspot.in/2015/02/alert-using-uialertcontroller-textfield.html