Custom UITextField using @IBDesignable with Swift 3

Custom UITextField

import UIKit

@IBDesignable class CustomUITextField: UITextField {

    @IBInspectable var cornerRadius: CGFloat = 0 {
        
        didSet {
            layer.cornerRadius = cornerRadius
        }
    }

    
    @IBInspectable var borderWidth: CGFloat = 0 {
        
        didSet {
            
            layer.borderWidth = borderWidth
        }
    }
    
    @IBInspectable var borderColor: UIColor = UIColor.clear {
        
        didSet {
            
            self.layer.borderColor = borderColor.cgColor
        }
    }
    
    @IBInspectable var placeHolderColor: UIColor? {
        get {
            return self.placeHolderColor
        }
        set {
            self.attributedPlaceholder = NSAttributedString(string:self.placeholder != nil ? self.placeholder! : "", attributes:[NSForegroundColorAttributeName: newValue!])
        }
    }
    
    @IBInspectable var placeHolderSize: UIFont? {
        get {
            return self.placeHolderSize
        }
        set {
            self.attributedPlaceholder = NSMutableAttributedString(string: self.placeholder != nil ? self.placeholder! : "", attributes:[NSFontAttributeName:UIFont(name: "", size: 0)!])
        }
    }
    
    override func leftViewRect(forBounds bounds: CGRect) -> CGRect {
        var textRect = super.leftViewRect(forBounds: bounds)
        textRect.origin.x += leftPadding
        return textRect
    }
    
    @IBInspectable var leftImage: UIImage? {
        didSet {
            updateView()
        }
    }
    
    @IBInspectable var leftPadding: CGFloat = 0
    
    @IBInspectable var color: UIColor = UIColor.lightGray {
        didSet {
            updateView()
        }
    }
    
    func updateView() {
        if let image = leftImage {
            leftViewMode = UITextFieldViewMode.always
            let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 20, height: 20))
            imageView.image = image
            // Note: In order for your image to use the tint color, you have to select the image in the Assets.xcassets and change the "Render As" property to "Template Image".
            imageView.tintColor = color
            leftView = imageView
        } else {
            leftViewMode = UITextFieldViewMode.never
            leftView = nil
        }
    }


}