首先介绍一下文件的结构

class ViewController: UIViewController {

    //声明成员变量
    override func viewDidLoad() {
        super.viewDidLoad()
    //代码实现
        // Do any additional setup after loading the view, typically from a nib.
    }
    //代码调用的函数
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

注意:Swift代码中会出现"!"和"?",在此不述,你可以去看看大神们写的

//UILabel
        let label = UILabel(frame: CGRect(x: 50, y: 50, width: 200, height: 50))
        label.text = "你好,斯威夫特"
        label.textColor = UIColor.blue
        label.textAlignment = .center
        label.backgroundColor = UIColor.red
        label.font = UIFont.systemFont(ofSize: 30)
        self.view.addSubview(label)

//UIButton的使用
       let btn = UIButton(type: UIButtonType.system)
        btn.frame = CGRect(x:50, y: 100, width: 100, height: 50)
        btn.backgroundColor = UIColor.gray
        btn.setTitle("按钮", for: UIControlState.normal)
        btn.titleLabel?.font = UIFont.systemFont(ofSize: 30)
        btn.setTitleColor(UIColor.red, for: UIControlState.normal)
        btn.layer.cornerRadius = 15
        btn.addTarget(self, action:#selector(btnAction1(sender:)), for: .touchUpInside)
        self.view?.addSubview(btn)

 //button Action
    func btnAction1(sender:UIButton){
        print("点击了")
//UIAlertController的使用
        let alert = UIAlertController(title: "警告", message:nil , preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "确定", style: .default, handler: nil))
        alert.addAction(UIAlertAction(title: "取消", style: .cancel, handler: { (UIAlertAction) in
            print("取消了")
        }))
        
        self.present(alert, animated: true, completion: nil)
    }

//UIImageView
let imageV = UIImageView(frame: CGRect(x: 0, y: KScreenHeight-KScreenWidth, width: KScreenWidth, height: KScreenWidth))
        imageV.image = UIImage.init(named: "123.jpeg")
        self.view.addSubview(imageV)

//UITextView
        let textV = UITextView(frame: CGRect(x:150, y: 100, width: 100, height: 50))
        textV.textColor = UIColor.white
        textV.backgroundColor = UIColor.black
        self.view.addSubview(textV)

//UITextField
        let textF = UITextField(frame: CGRect(x:250, y: 50, width: 100, height: 50))
        textF.textColor = UIColor.black
        textF.placeholder = "输入"
        textF.borderStyle = .line
        self.view.addSubview(textF)

 //UISlider
        let slider = UISlider(frame: CGRect(x:100, y: 150, width: 100, height: 50))
        self.view.addSubview(slider)

 //要开启 NSAllowsArbitraryLoads为yes,不然存在报错可能
 //UIWebView
        let webView = UIWebView(frame: self.view.bounds)
        let url = NSURL(string:"https://www.baidu.com")
        let request = NSURLRequest(url: url! as URL)
        webView.loadRequest(request as URLRequest)
        self.view.addSubview(webView)

//UITableView
class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource{
    var tableView : UITableView?
    var dataA = ["北京","上海","深圳","广州","天津","南京","杭州","武汉"]
    override func viewDidLoad() {
        super.viewDidLoad() 
        self.createTableView()
    }
    func createTableView(){
        self.tableView = UITableView.init(frame:self.view.bounds,style:.plain)
        self.tableView?.delegate = self
        self.tableView?.dataSource = self
        self.view.addSubview(self.tableView!)
    }
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return dataA.count
    }
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let identifier = "cell"
        let cell = UITableViewCell.init(style:.default, reuseIdentifier: identifier)
        cell.textLabel?.text = dataA[indexPath.row]  
        return cell
    }
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        //取消选中状态
        tableView.deselectRow(at: indexPath, animated: true)
        let str = dataA[indexPath.row]
        print("用户选择了\(str)")
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

//UICollectionView
//可以不签订layout

class ViewController: UIViewController,UICollectionViewDelegate,UICollectionViewDataSource{
    let KScreenWidth = UIScreen.main.bounds.size.width
    let KScreenHeight = UIScreen.main.bounds.size.height
   
    var collectionV : UICollectionView?
    override func viewDidLoad() {
        super.viewDidLoad()
       
        self.createCollection()
    }

    func createCollection(){
    //设置Layout
    let layout = UICollectionViewFlowLayout()
    layout.scrollDirection = .vertical//滚动方向
    layout.itemSize  = CGSize(width: (KScreenWidth - 30)/2, height: 80)
    layout.sectionInset = UIEdgeInsetsMake(24, 0, 0, 0);
        
    //collection
    self.collectionV = UICollectionView(frame: self.view.bounds, collectionViewLayout: layout)
    collectionV?.dataSource = self
    collectionV?.delegate = self
    collectionV?.backgroundColor = UIColor.white
    collectionV?.register(UICollectionViewCell().classForCoder,   forCellWithReuseIdentifier: "item");
    self.view.addSubview(collectionV!)
    }
    
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 1
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int{
        return 60
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "item", for: indexPath);
        
        cell.backgroundColor = UIColor.red
        
        return cell
        
    }
   
    //UICollectionViewDelegateFlowLayout
//    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAtIndex section: Int) -> UIEdgeInsets{
//        return UIEdgeInsetsMake(5, 10, 5, 10)
//    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}