You can put this function your global file or above your class so you can access it in entire application. After this procedure you can call this function as per your requirement in application.
func SetLeftSIDEImage(TextField: UITextField, ImageName: String){
let leftImageView = UIImageView()
leftImageView.contentMode = .scaleAspectFit
let leftView = UIView()
leftView.frame = CGRect(x: 20, y: 0, width: 30, height: 20)
leftImageView.frame = CGRect(x: 13, y: 0, width: 15, height: 20)
TextField.leftViewMode = .always
TextField.leftView = leftView
let image = UIImage(named: ImageName)?.withRenderingMode(.alwaysTemplate)
leftImageView.image = image
leftImageView.tintColor = UIColor(red: 106/255, green: 79/255, blue: 131/255, alpha: 1.0)
leftImageView.tintColorDidChange()
leftView.addSubview(leftImageView)
}
SetLeftSIDEImage(TextField: Your_textField, ImageName: “YourImageName”) // call function