@符不見了

    let datas = ["點(diǎn)擊一下改變字體，","字體就會(huì)改變痴脾，","你相信不，","不相信么，","點(diǎn)一下試試吧??艘儒！"]
    let fontNames = ["MFTongXin_Noncommercial-Regular", "MFJinHei_Noncommercial-Regular", "MFZhiHei_Noncommercial-Regular", "Heiti SC"]
    var fontNumber = 0
    let reuseIdentifier = "FontCell"

StatusBar設(shè)置

樣式:

override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }

隱藏:

override var prefersStatusBarHidden: Bool {
        return false
    }

遵守代理

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
}

??

??: 空合運(yùn)算符, a ?? b，對(duì)可選類型a進(jìn)行判斷夫偶，為nil默認(rèn)值為b界睁，不為空就解封

let cell = tableView.dequeueReusableCell(withIdentifier: reuseIdentifier) ?? UITableViewCell(style: .subtitle, reuseIdentifier: reuseIdentifier)

+拼接

 let str = "當(dāng)前字體是："+(cell?.textLabel?.font.fontName)!

<li><h1>學(xué)習(xí)代碼:<h1></li>

ViewController.swift

import UIKit

/*
 導(dǎo)入字體步驟：
 1.下載ttf文件，加入項(xiàng)目中
 2.在info.plist中兵拢，添加一個(gè)字段：Fonts provided by application
 3.再添加item翻斟，值寫入字體的名字
 4.然后就可以通過名字使用了
 */

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
    
    let tableView = UITableView(frame: CGRect(x: 0.0, y: 0.0, width: YHScreenWidth, height: YHScreenHeight*2/3), style: .plain)
    let button = UIButton(frame: CGRect(x: 0.0, y: YHScreenHeight*2/3, width: YHScreenWidth, height: YHScreenHeight/3))
    let datas = ["點(diǎn)擊一下改變字體，","字體就會(huì)改變说铃，","你相信不访惜，","不相信么嘹履，","點(diǎn)一下試試吧??！"]
    let fontNames = ["MFTongXin_Noncommercial-Regular", "MFJinHei_Noncommercial-Regular", "MFZhiHei_Noncommercial-Regular", "Heiti SC"]
    var fontNumber = 0
    let reuseIdentifier = "FontCell"

    override func viewDidLoad() {
        super.viewDidLoad()
        setupView()
    }
    
// MARK: - 操作
    //設(shè)置狀態(tài)欄樣式
    /*設(shè)置狀態(tài)欄：
     @available(iOS 7.0, *)
     open var preferredStatusBarStyle: UIStatusBarStyle { get }//樣式
     
     @available(iOS 7.0, *)
     open var prefersStatusBarHidden: Bool { get }//是否隱藏
    */
    override var preferredStatusBarStyle: UIStatusBarStyle {
        return .lightContent
    }
    func setupView() {
        tableView.delegate = self
        tableView.dataSource = self
        tableView.backgroundColor = .black
        
        button.setTitle("改變字體", for: .normal)
        button.backgroundColor = .orange
        button.addTarget(self, action: #selector(changFont), for: .touchUpInside)
        
        view.addSubview(tableView)
        view.addSubview(button)
    }
    func changFont() {
        fontNumber = (fontNumber+1)%fontNames.count
        tableView.reloadData()
    }
    
// MARK: - delegate and dataSource
    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return datas.count
    }
    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return YHScreenHeight*2.0/3.0/CGFloat(datas.count)
    }
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        /*代碼創(chuàng)建债热，并且沒有注冊(cè)cell的情況下砾嫉，用dequeueReusableCell(withIdentifier identifier: String) -> UITableViewCell?
         如果已經(jīng)注冊(cè)了，或者用的xib窒篱，就使用dequeueReusableCell(withIdentifier identifier: String, for indexPath: IndexPath) -> UITableViewCell
         */
        //??空合運(yùn)算符焰枢，a ?? b，對(duì)可選類型a進(jìn)行判斷舌剂，為nil默認(rèn)值為b济锄，不為空就解封
        let cell = tableView.dequeueReusableCell(withIdentifier: reuseIdentifier) ?? UITableViewCell(style: .subtitle, reuseIdentifier: reuseIdentifier)
        let text = datas[indexPath.row]
        
        cell.textLabel?.text = text
        cell.textLabel?.textColor = .white
        cell.textLabel?.font = UIFont(name: fontNames[fontNumber], size: 24)
        cell.backgroundColor = .black
        
        return cell
    }
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        //取消點(diǎn)擊效果
        tableView.deselectRow(at: indexPath, animated: true)
        let cell = tableView.cellForRow(at: indexPath)
        //鏈?zhǔn)秸{(diào)用，最后得到一個(gè)可選的string,霍转！強(qiáng)制解包出來
        let str = "當(dāng)前字體是："+(cell?.textLabel?.font.fontName)!
        print(str)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }


}