擔(dān)心表述不清楚，直接上代碼：https://gitee.com/xgkp/necessaryAlert.git
以下是簡單流程：

1. 創(chuàng)建一個UsefulAlertView繼承于UIview,得到一個UsefulAlertView.swift文件
   2.Xib創(chuàng)建一個同名的UsefulAlertView.xib

0.png

并且放置一個Button
3.綁定UsefulAlertView.swift 和 UsefulAlertView.xib
注意綁定控件的時候要注意選擇區(qū)域：如下圖

1.png

Button的視圖和UsefulAlertView.swift綁定
Button的點擊事件和UsefulAlertView.swift綁定

4. UsefulAlertView.swift里的代碼初始化并設(shè)置點擊事件

//
//  UsefulAlertView.swift
//  newproject
//
//  Created by Pro on 2018/1/17.
//  Copyright ? 2018年 Pro. All rights reserved.
//

import UIKit

class UsefulAlertView: UIView {

    @IBOutlet weak var TestDisplayBtn: UIButton!
    
    var ConnectView:UIView!
    
    var buttonCallBack:(() -> ())?


    override init(frame: CGRect) {
        super.init(frame: frame)
        ConnectView = loadViewFromNib()
        addSubview(ConnectView)
        addConstraints()
        initialSetup()
    }
    

    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        ConnectView = loadViewFromNib()
        addSubview(ConnectView)
        addConstraints()
        initialSetup()
    }
    
    func loadViewFromNib() -> UIView {
        let className = type(of: self)
        let bundle = Bundle(for: className)
        let name = NSStringFromClass(className).components(separatedBy: ".").last
        let nib = UINib(nibName: name!, bundle: bundle)
        let view = nib.instantiate(withOwner: self, options: nil).first as! UIView
        return view
    }

    func addConstraints() {
        ConnectView.translatesAutoresizingMaskIntoConstraints = false
        var constraint = NSLayoutConstraint(item: ConnectView, attribute: .leading,
                                            relatedBy: .equal, toItem: self, attribute: .leading,
                                            multiplier: 1, constant: 0)
        addConstraint(constraint)
        constraint = NSLayoutConstraint(item: ConnectView, attribute: .trailing,
                                        relatedBy: .equal, toItem: self, attribute: .trailing,
                                        multiplier: 1, constant: 0)
        addConstraint(constraint)
        constraint = NSLayoutConstraint(item: ConnectView, attribute: .top, relatedBy: .equal,
                                        toItem: self, attribute: .top, multiplier: 1, constant: 0)
        addConstraint(constraint)
        constraint = NSLayoutConstraint(item: ConnectView, attribute: .bottom,
                                        relatedBy: .equal, toItem: self, attribute: .bottom,
                                        multiplier: 1, constant: 0)
        addConstraint(constraint)
    }
    
    //初始化默認(rèn)屬性配置
    func initialSetup(){
        TestDisplayBtn.backgroundColor = UIColor.red
    }
    
    @IBAction func AlertBtnAction(_ sender: UIButton) {
        if buttonCallBack != nil {
            buttonCallBack!()
        }
    }
    }

5.Viewcontroller中的調(diào)用和點擊事件的賦值

//
//  ViewController.swift
//  newproject
//
//  Created by Pro on 2018/1/17.
//  Copyright ? 2018年 Pro. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    

    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    
    override func viewDidAppear(_ animated: Bool){
        super.viewDidAppear(animated)
        
        let myAlert = UsefulAlertView(frame: CGRect(x: 0 , y: 0, width: UIScreen.main.bounds.width , height: UIScreen.main.bounds.height))
                myAlert.buttonCallBack = {() -> () in
                    myAlert.removeFromSuperview()
                    print("click it")
                    
        }

        self.view.addSubview(myAlert)
        
       
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

6.具體按鈕點擊事件可以用block，target,delegate實現(xiàn)，本文選擇用的是block，如果需要自己用target和delegate寫女阀，請參考以下第二個鏈接。
參考來源：http://www.hangge.com/blog/cache/detail_1394.html
參考來源：http://blog.csdn.net/syg90178aw/article/details/47020097
參考來源：http://www.reibang.com/p/b8a46bc55373