iOS / Swift - UITextField subclass for handling dismissing when return key tapped, padding for placeholder text, turning off auto correction, and enabling clear button

BaseTextField.swift

import UIKit

@IBDesignable
class BaseTextField: UITextField {

    let leftPadding: CGFloat = 20

    override func awakeFromNib() {
        self.delegate = self
        self.returnKeyType = UIReturnKeyType.Done
        self.autocorrectionType = UITextAutocorrectionType.No
        self.clearButtonMode = UITextFieldViewMode.WhileEditing
    }

    override func textRectForBounds(bounds: CGRect) -> CGRect {
        return CGRectInset(bounds, leftPadding, 0)
    }

    override func editingRectForBounds(bounds: CGRect) -> CGRect {
        return CGRectInset(bounds, leftPadding, 0)
    }

}

extension BaseTextField: UITextFieldDelegate {

    func textFieldShouldReturn(textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return false
    }

}