swift 利用URLSession 下载多张图片

先上效果图

再上源码

1. 对于URLSession做了个简单的封装，用来请求网络数据

import Foundation

class LJDownLoadNetImage: NSObject {

    static func request(_ method: String,url: String,callback: @escaping (_ data: Data?,_ response: URLResponse?,_ error: Error?) -> Void) {
        let session = URLSession.shared
        let request = NSMutableURLRequest(url: NSURL(string: url)! as URL)
        request.httpMethod = method
        let task = session.dataTask(with: request as URLRequest,completionHandler: { (data,response,error) -> Void in
            callback(data,error)
        })
        task.resume()
    }
}

import UIKit

class TFNetImageViewController: TFBaseViewController,UITableViewDataSource,UITableViewDelegate{

    var TFTableView:UITableView!
    var titleItemArray = ["姓名","账号","爱好","职业","年薪"]
    
    var imageUrlArray =  ["http://pica.nipic.com/2007-12-12/20071212235955316_2.jpg","http://hangge.com/blog/images/logo.png","https://www.iphonetrain.com/core/res/images/logo.png","http://pica.nipic.com/2007-12-12/20071212235955316_2.jpg","http://pica.nipic.com/2007-12-12/20071212235955316_2.jpg"];
    
    override func viewDidLoad() {
        super.viewDidLoad()

        self.setTopNavBarTitle("个人信息")
        self.setTopNavBackButton()
        self.view.backgroundColor = UIColor.lightGray
        self.creatTable()
    }
    
    func creatTable(){

        TFTableView = UITableView(frame: CGRect(x: 0,y: 64,width: AppWidth,height: AppHeight - 64),style:UITableViewStyle.grouped);
        TFTableView.delegate = self;
        TFTableView.dataSource = self;
        self.view.addSubview(TFTableView);
        
        TFTableView.register(TFNetImageTableViewCell.self,forCellReuseIdentifier: "identtifier")
    }
    
    //MARK: UITableViewDataSource
    func numberOfSections(in tableView: UITableView) -> Int {
        return 1;
    }
    
    func tableView(_ tableView: UITableView,numberOfRowsInSection section: Int) -> Int {
            return 5;
    }
    
    func tableView(_ tableView: UITableView,heightForRowAt indexPath: IndexPath) -> CGFloat{
            return 55;
    }
    
    func tableView(_ tableView: UITableView,heightForHeaderInSection section: Int) -> CGFloat {
        return 10;
    }
    

    func tableView(_ tableView: UITableView,heightForFooterInSection section: Int) -> CGFloat {
        return 1;
    }

    func tableView(_ tableView: UITableView,cellForRowAt indexPath: IndexPath) -> UITableViewCell {
  
        let cellIdentifier : String = "identtifier"
        let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier) as! TFNetImageTableViewCell
        
        let urlStr = "https://raw.githubusercontent.com/onevcat/Kingfisher/master/images/kingfisher-(indexPath.row + 1).jpg"
        //cell.setCellData((titleItemArray[indexPath.row] as NSString) as String,imageUrlStr: imageUrlArray[indexPath.row])
        
        cell.setCellData(titleItemArray[indexPath.row],imageUrlStr: urlStr)

        return cell
    }
    
    //MARK: UITableViewDelegate
    func tableView(_ tableView: UITableView,didSelectRowAt indexPath: IndexPath) {
        
        tableView.deselectRow(at: indexPath,animated: true);
    }
 }

import UIKit

class TFNetImageTableViewCell: UITableViewCell {

    var titleImage : UIImageView!
    var titleLabel : UILabel!
    
    override init(style: UITableViewCellStyle,reuseIdentifier: String?) {
        super.init(style: style,reuseIdentifier: reuseIdentifier)
        
        self.creatCell()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func setSelected(_ selected: Bool,animated: Bool) {
        super.setSelected(selected,animated: animated)
        self.selectionStyle = UITableViewCellSelectionStyle.none
        // Configure the view for the selected state
    }
    
    
    func creatCell(){
       //http://pica.nipic.com/2007-12-12/20071212235955316_2.jpg

        //设置label
        titleLabel = UILabel(frame: CGRect(x: 60,y: 18,width: 40,height: 14))
        titleLabel.textAlignment = NSTextAlignment.center
        titleLabel.font = UIFont.systemFont(ofSize: 14.0)
        self.contentView.addSubview(titleLabel)
        
        /*
           1. 直接加载本地的图片
         */
        
        /*
        titleImage = UIImageView(frame: CGRect(x: 0,y: 5,height: 40))
        titleImage.image = UIImage(named: "unicorn.png")
        titleImage.backgroundColor = UIColor.red;
        self.contentView.addSubview(titleImage)
         */
        
        /*
           2. 加载网络图片
         */
        
        /*
        //定义NSURL对象
        let url = NSURL.init(string: "http://hangge.com/blog/images/logo.png")
        //从网络获取数据流
        let data = NSData(contentsOf: url! as URL)
        
        //此处如果data有值的话，才去初始化image
        if (data != nil) {
            //通过数据流初始化图片
            let newImage = UIImage(data: data! as Data)
            let  titleImage = UIImageView(frame: CGRect(x: 0,height: 40))
            titleImage.image = newImage
            self.contentView.addSubview(titleImage)
        }
        else{
            /*
              直接加载本地的图片
             */
            titleImage = UIImageView(frame: CGRect(x: 0,height: 40))
            titleImage.image = UIImage(named: "unicorn.png")
            titleImage.backgroundColor = UIColor.red;
            self.contentView.addSubview(titleImage)
        }
 */
    }
    
    func setCellData(_ labelNameStr:String,imageUrlStr:String)
    {
       titleLabel.text = labelNameStr as String
        
        /*
         3. 利用封装的URLSession加载网络图片
         */
        LJDownLoadNetImage.request("GET",url: imageUrlStr) { (data,error) in
            
            //此处如果data有值的话，才去初始化image
            if (data != nil) {
                let newImage = UIImage(data: data! as Data)
                let  titleImage = UIImageView(frame: CGRect(x: 0,height: 40))
                titleImage.image = newImage
                self.contentView.addSubview(titleImage)
            }
        }
        
        /*
        //定义NSURL对象
        let url = NSURL.init(string: imageUrlStr)
        //从网络获取数据流
        let data = NSData(contentsOf: url! as URL)
        
        //此处如果data有值的话，才去初始化image
        if (data != nil) {
            //通过数据流初始化图片
            let newImage = UIImage(data: data! as Data)
            let  titleImage = UIImageView(frame: CGRect(x: 0,height: 40))
            titleImage.image = newImage
            self.contentView.addSubview(titleImage)
        }
        else{
            /*
             直接加载本地的图片
             */
            titleImage = UIImageView(frame: CGRect(x: 0,height: 40))
            titleImage.image = UIImage(named: "unicorn.png")
            titleImage.backgroundColor = UIColor.red;
            self.contentView.addSubview(titleImage)
        }
 */
    }

}

（编辑：李大同）

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