1.ViewController.swift

import UIKitclass ViewController: UIViewController {    override func viewDidLoad() {        super.viewDidLoad()       

 //获取当前控制器的view,设置背景颜色为红色     

   //self.view.backgroundColor = UIColor.red      

  //初始化方法,设置大小坐标       

 let rect = CGRect(x: 30, y: 30, width: 100, height: 200)        let subview:UIView = UIView(frame:rect)        

//把子视图加载上父视图  

      subview.backgroundColor = UIColor.red        self.view.addSubview(subview)        

//frame相对于父视图  

      let subview1 = UIView()        subview1.frame = CGRect(x: 140, y: 240, width: 100, height: 100)      subview1.backgroundColor = UIColor.yellow        self.view.addSubview(subview1)                      

  //center       

 let subview3 = UIView()        self.view.addSubview(subview3)        subview3.frame = CGRect(origin: self.view.center, size: CGSize(width: 20, height: 20))            subview3.backgroundColor = #colorLiteral(red: 0.3411764801, green: 0.6235294342, blue: 0.1686274558, alpha: 1)         

 //透明度       

 //subview3.alpha = 0.1  会影响视图        subview3.backgroundColor = UIColor(colorLiteralRed: 0.5, green: 0.5, blue: 0.5, alpha: 0.5)        let subview4 = UIView(frame: CGRect(x: 10, y: 10, width: 40, height: 40))        subview4.backgroundColor = #colorLiteral(red: 0.5725490451, green: 0, blue: 0.2313725501, alpha: 1)        subview3.addSubview(subview4)       

 //tag值使用2000以上，100以下系统用        subview4.tag = 10001        let Tagview = subview3.viewWithTag(10001)        print("subview4 = \(subview4),Tagview = \(Tagview)")                //subview4.isHidden = true

 //隐藏        //用户交互    

    self.view.isUserInteractionEnabled = true     

     //superview是父试图      print("subview = \(subview4.superview),subview3 = \(subview3)")    for item in self.view.subviews{            

//从父试图上移除   

       // item.removeFromSuperview()            print(item)                            }            }    override func touchesBegan(_ touches: Set, with event: UIEvent?) {

print("点击了当前控制器")

}

override func didReceiveMemoryWarning() {

super.didReceiveMemoryWarning()

}

}