UITextField shadow won't show - ios

Question

In my xib file, I have created a generic function through which I wanted to add a bottom border through implementing a shadow to those textfields
func setupTextField(textField: UITextField) {
textField.leftViewMode = UITextFieldViewMode.always
let imageView = UIImageView();
let image = UIImage(named: "calendar");
imageView.image = image;
imageView.frame = CGRect(x: 5, y: 8, width: 20, height: 20)
textField.addSubview(imageView)
let paddingView = UIView(frame: CGRect(x: 0, y: 0, width: 40, height: textField.frame.height))
textField.leftView = paddingView
textField.borderStyle = .none
textField.layer.backgroundColor = UIColor.white.cgColor
textField.layer.masksToBounds = false
textField.layer.shadowColor = UIColor(hex: "#D8D8D8").cgColor
textField.layer.shadowOffset = CGSize(width: 0.0, height: 1.0)
textField.layer.shadowOpacity = 1.0
textField.layer.shadowRadius = 0.0
}
And I have called this function from my awakeFromNib() method and as a result it added the shadow on my 2nd UITextField but not at the 1st one. Though from debug I can see that if there is no 2nd UITextField then this would draw a shadow on my 1st one.
How to overcome this problem?

Answer 1

For swift 4, swift 4.2, swift 5 Please refer below answer
Can give shadow to any UIView sub classes(imageview, label, textfield, textview etc)
extension UIView {
/* The color of the shadow. Defaults to opaque black. Colors created
* from patterns are currently NOT supported. Animatable. */
#IBInspectable var shadowColor: UIColor? {
set {
layer.shadowColor = newValue!.cgColor
}
get {
if let color = layer.shadowColor {
return UIColor(cgColor: color)
}
else {
return nil
}
}
}
/* The opacity of the shadow. Defaults to 0.4 Specifying a value outside the
* [0,1] range will give undefined results. Animatable. */
#IBInspectable var shadowOpacity: Float {
set {
layer.shadowOpacity = newValue
}
get {
return layer.shadowOpacity
}
}
/* The shadow offset. Defaults to (1, 2). Animatable. */
#IBInspectable var shadowOffset: CGPoint {
set {
layer.shadowOffset = CGSize(width: newValue.x, height: newValue.y)
}
get {
return CGPoint(x: layer.shadowOffset.width, y:layer.shadowOffset.height)
}
}
/* The blur radius used to create the shadow. Defaults to 3. Animatable. */
#IBInspectable var shadowRadius: CGFloat {
set {
layer.shadowRadius = newValue
}
get {
return layer.shadowRadius
}
}
}

Answer 2

Textfield shadow
swift 4.2
textFieldDOB.backgroundColor = UIColor.white textFieldDOB.clipsToBounds = false
textFieldDOB.layer.shadowColor = UIColor.black.cgColor
textFieldDOB.layer.shadowOffset = CGSize.zero
textFieldDOB.layer.shadowOpacity = 0.3
textFieldDOB.layer.shadowRadius = 6
textFieldDOB.borderStyle = .none