IOS UITextField UIButton 结合

import UIKit
 class ViewController：UIViewController,UITextFieldDelegate {
 override func viewDidLoad() {
 super.viewDidLoad()
 // Do any additional setup after loading the view,typically from a nib.
 let rect = CGRect(x：10, y：80, width：300, height：40)
 let textField = UITextField(frame：rect)
 textField.placeholder = “Bank card no”
 textField.autocorrectionType =UITextAutocorrectionType.no
 textField.returnKeyType = UIReturnKeyType.done
 textField.clearButtonMode =UITextFieldViewMode.whileEditing
 textField.keyboardType = UIKeyboardType.numberPad
 textField.keyboardAppearance =UIKeyboardAppearance.dark
 textField.delegate = self
 textField.borderStyle = UITextBorderStyle.line
 // textField.clearButtonMode = .whileEditing
 let btnLeft：UIButton = UIButton(type：UIButtonType.custom)
 btnLeft.frame = CGRect(x：0,y：0,width：30,height：30)
 btnLeft.setBackgroundImage(UIImage(named：”银行信息”), for：UIControlState())
 textField.leftView = btnLeft
 textField.leftViewMode = .unlessEditing
 let btnRight：UIButton = UIButton(type：UIButtonType.custom)
 btnRight.frame = CGRect(x：0,y：0,width：30,height：30)
 textField.rightViewMode = .always
 btnRight.addTarget(self, action：#selector(touchupInsideBtnAction(：)), for：
 UIControlEvents.touchUpInside)
 btnRight.setBackgroundImage(UIImage(named：”相机”), for：UIControlState())
 textField.rightView = btnRight
 self.view.addSubview(textField)
 }
 func textFieldShouldReturn( textField：UITextField)-> Bool {
 textField.resignFirstResponder()
 return true
 }
 func touchupInsideBtnAction(_ btn：UIButton)
 {
 let message = “模拟拍照扫描银行卡.”
 let alert = UIAlertController(title：“Information”,message：message, preferredStyle：UIAlertControllerStyle.alert)
 let OKAction = UIAlertAction(title：“OK”, style：UIAlertActionStyle.default, handler：nil)
 alert.addAction(OKAction)
 self.present(alert, animated：true, completion：nil)
 }
 }