Swift3.0 创建UIButton,通知NSNotifica

1.使用懒加载创建按钮, 代码的封装

 view.addSubview(btn);

fileprivate lazy var btn:UIButton = {
        
        let btn = UIButton(type: .custom)
        //2.定义frame
        btn.frame = CGRect(x: 50, y: 50, width: 50, height: 50)
        btn.backgroundColor=UIColor.green
        btn .setTitle("这是按钮", for: .normal)
        btn .addTarget(self , action:#selector(chushihuaBtn), for: .touchUpInside)
        return btn
    }()

2.关于通知的使用

NSNotification
  //通知名称常量 
   let NotifyChatMsgRecv = NSNotification.Name(rawValue:"notifyChatMsgRecv") 
      
      
   //发送通知 
   NotificationCenter.default.post(name:NotifyChatMsgRecv, object: nil, userInfo: notification.userInfo) 
       
   //接受通知监听 
   NotificationCenter.default.addObserver(self, selector:#selector(didMsgRecv(notification:)), 
                                                  name: NotifyChatMsgRecv, object: nil) 
            
   //通知处理函数 
   func didMsgRecv(notification:NSNotification){ 
           print("didMsgRecv: \(notification.userInfo)")        
}