Custom IBDesignable and IBInspectable UITextField created for use in the Devslopes App

DATextField.swift

//
//  DATextField.swift
//  devslopes-app
//
//  Created by Jack Davis on 2/26/16.
//  Copyright © 2016 Devslopes. All rights reserved.
//

import UIKit

@IBDesignable
class DATextField: UITextField {

    
    // MARK: - IBInspectable
    @IBInspectable var tintCol: UIColor = UIColor(netHex: 0x707070)
    @IBInspectable var fontCol: UIColor = UIColor(netHex: 0x707070)
    @IBInspectable var shadowCol: UIColor = UIColor(netHex: 0x707070)
    
    @IBInspectable var image: UIImage? = nil
    
    @IBInspectable var placeholderText: String?
    
    @IBInspectable var imgLeftInset: CGFloat = 10.0
    
    @IBInspectable var imgTopInset: CGFloat = 7.0
    
    @IBInspectable var imgBottomInset: CGFloat = 7.0
    
    // MARK: - Properties
    var textFont = UIFont(name: "Noto Sans", size: 14.0)
    var imgView: UIImageView?
    
    // MARK: - View
    override func awakeFromNib() {
        setupView()
    }
    
    override func prepareForInterfaceBuilder() {
        super.prepareForInterfaceBuilder()
        setupView()
    }
    
    func setupView() {

        self.layer.masksToBounds = false
        self.layer.shadowColor = shadowCol.CGColor
        self.layer.shadowOpacity = 0.2
        self.layer.shadowRadius = 1.0
        self.layer.shadowOffset = CGSizeMake(0.0, 0.0)
        self.tintColor = tintCol
        self.textColor = fontCol
        
        // email icon color #B3B3B3
        if let phText = self.placeholderText {
            self.attributedPlaceholder = NSAttributedString(string: phText, attributes: [NSForegroundColorAttributeName: UIColor(netHex: 0xB3B3B3)])
        }
        
        if let fnt = textFont {
            self.font = fnt
        } else {
            self.font = UIFont(name: "Helvetica Neue", size: 14.0)
        }
        
        self.setNeedsLayout()
        self.setNeedsDisplay()

    }
    
    override func drawRect(rect: CGRect) {
        super.drawRect(rect)
        
        if self.image != nil {
            self.imgView = UIImageView(frame: CGRectMake(self.imgLeftInset, self.imgTopInset, self.bounds.height - (self.imgTopInset + self.imgBottomInset), self.bounds.height - (self.imgTopInset + imgBottomInset)))
            self.imgView!.contentMode = .ScaleAspectFit
            self.imgView!.image = self.image
            self.addSubview(self.imgView!)
            
        }
    }

    // Placeholder text
    override func textRectForBounds(bounds: CGRect) -> CGRect {
        if let iView = self.imgView {
            return CGRectInset(bounds, iView.bounds.size.width + 15, 0)
        } else {
            return CGRectInset(bounds, 10, 0)
        }
        
    }
    
    // Editable text
    override func editingRectForBounds(bounds: CGRect) -> CGRect {
        if let iView = self.imgView {
            return CGRectInset(bounds, iView.bounds.size.width + 15, 0)
        } else {
            return CGRectInset(bounds, 10, 0)
        }
    }

}

hi, I'm facing issue in iPad while using "textRectForBounds" like (calayer position contains nan 240 nan) May i know what is the issue