如何在swift中禁用SkyFloatingLabelTextField中的复制粘贴功能？

import SkyFloatingLabelTextField

class CustomTextField: SkyFloatingLabelTextField {
    override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
        // 禁用复制粘贴功能
        if action == #selector(UIResponderStandardEditActions.copy(_:)) ||
           action == #selector(UIResponderStandardEditActions.paste(_:)) {
            return false
        }
        return super.canPerformAction(action, withSender: sender)
    }
}

let textField = CustomTextField()