JoinViewController+Constraints.swift

extension JoinViewController {
    func setupConstraints() {
        view.addConstraints([
            channelTextField.widthAnchor.constraint(equalToConstant: 100),
            channelTextField.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            channelTextField.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 10),
            joinButton.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            joinButton.topAnchor.constraint(equalTo: channelTextField.bottomAnchor)
        ])
    }
}