// class MainTabController
let actionButton = UIButton(type: .system).then {
$0.tintColor = .systemBackground
$0.backgroundColor = .systemCyan
$0.setImage(UIImage(named: "new_tweet"), for: .normal)
$0.layer.cornerRadius = 28
}
func configureUI() {
view.addSubview(actionButton)
actionButton.snp.makeConstraints {
$0.height.width.equalTo(56)
$0.bottom.equalTo(view.safeAreaLayoutGuide).inset(64)
$0.trailing.equalTo(view.safeAreaLayoutGuide).inset(16)
}
}