import MessageViewController
class ViewController: MessageViewController {
  // ...
}

func viewDidLoad() {
  super.viewDidLoad()
  setup(scrollView: scrollView)
}

// Border between the text view and the scroll view
borderColor = .lightGray
// Change the appearance of the text view and its content
messageView.inset = UIEdgeInsets(top: 8, left: 16, bottom: 8, right: 16)
messageView.textView.placeholderText = "New message..."
messageView.textView.placeholderTextColor = .lightGray
messageView.font = .systemFont(ofSize: 17)
// Setup the button using text or an icon
messageView.set(buttonTitle: "Send", for: .normal)
messageView.addButton(target: self, action: #selector(onButton))
messageView.buttonTint = .blue
// Set custom attributes for an autocompleted string
let tintColor = .blue
messageAutocompleteController.autocompleteTextAttributes = ["@": [.font: UIFont.preferredFont(forTextStyle: .body), .foregroundColor: tintColor, .backgroundColor: tintColor.withAlphaComponent(0.1)]]

let tableView = messageAutocompleteController.tableView
tableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
tableView.dataSource = self
tableView.delegate = self

messageAutocompleteController.register(prefix: "@")
messageAutocompleteController.delegate = self

func didFind(controller: MessageAutocompleteController, prefix: String, word: String) {
  // filter your data
  controller.show(true)
}