MainViewController的代码：

@IBOutlet weak var totalText: UITextField!
var totalview:[UIView]!

override func viewDidLoad() {
    yvalue = 1
    tag = 1
    count = 1
    super.viewDidLoad()
    // Do any additional setup after loading the view,typically from a nib.
}

@IBAction func actionButton(_ sender: UIButton) {
    yvalue = 55 + yvalue
    //for i in 0...count {
        extraview = View(frame: CGRect(x: 50,y: 75+yvalue,width: 350,height: 50))
        extraview.backgroundColor = UIColor(white: 1,alpha: 0.5)
        extraview.layer.cornerRadius = 15
        extraview.tag = tag
        print("ExtraView tag=",extraview.tag)
        extraview.ActionButtonsub.addTarget(self,action: (#selector(cancelbutton(_:))),for: UIControlEvents.touchUpInside)
        extraview.textFiled.addTarget(self,action: #selector(didChangeTexts(textField:)),for: .editingChanged)
        extraview.textFiled.tag = tag
        print("text tag=",extraview.textFiled.tag)
        self.view.addSubview(extraview)
        count = count + 1
        tag = tag + 1
    //}
}

func cancelbutton(_ sender: UIButton) {
    extraview.removeFromSuperview()
}

func didChangeTexts(textField: UITextField) {
        totalText.text = extraview.textFiled.text
}

UIView的代码：

class View: UIView {

    @IBOutlet var subView: UIView!
    @IBOutlet weak var textFiled: UITextField!
    @IBOutlet weak var ActionButtonsub: UIButton!

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        Bundle.main.loadNibNamed("View",owner: self,options:nil)
        self.addSubview(self.subView)
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        Bundle.main.loadNibNamed("View",options: nil)
        subView.frame = bounds
        self.addSubview(self.subView)
    }
}

Sample Output