PaddingTextField.swift

import UIKit

@IBDesignable class PaddingTextField: UITextField {
    // MARK: Properties
    @IBInspectable var padding: CGPoint = CGPoint(x: 6.0, y: 0.0)

    // MARK: Internal Methods
    override func textRect(forBounds bounds: CGRect) -> CGRect {
        return bounds.insetBy(dx: self.padding.x, dy: self.padding.y)
    }

    override func editingRect(forBounds bounds: CGRect) -> CGRect {
        return bounds.insetBy(dx: self.padding.x, dy: self.padding.y)
    }

    override func placeholderRect(forBounds bounds: CGRect) -> CGRect {
        return bounds.insetBy(dx: self.padding.x, dy: self.padding.y)
    }
}

extension UITextField {
    func setLeftPaddingPoints(_ amount:CGFloat){
        let paddingView = UIView(frame: CGRect(x: 0, y: 0, width: amount, height: self.frame.size.height))
        self.leftView = paddingView
        self.leftViewMode = .always
    }

    func setRightPaddingPoints(_ amount:CGFloat) {
        let paddingView = UIView(frame: CGRect(x: 0, y: 0, width: amount, height: self.frame.size.height))
        self.rightView = paddingView
        self.rightViewMode = .always
    }
}