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Add Button on UItextField in swift 3

  
 var hideShowbtn = UIButton()
hideShowbtn = UIButton(type: .custom)
        hideShowbtn.setImage(UIImage(named: "HIdeShowImg"), for: .normal)
        hideShowbtn.frame = CGRect(x: CGFloat(self.passwordTF.frame.size.width - 25), y: CGFloat(0), width: CGFloat(25), height: CGFloat(25))
        hideShowbtn.addTarget(self, action: #selector(self.refresh), for: .touchUpInside)
        self.passwordTF.rightView = hideShowbtn

        self.passwordTF.rightViewMode = .always

Happy Coding :)
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