效果：

ViewController.swift

import UIKit
import SwiftyJSON
import Alamofire
import Kingfisher

class ViewController: UIViewController,UITableViewDataSource,UITableViewDelegate {

    @IBOutlet weak var tableview: UITableView!
    var books = [Book]()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        let urlString = "https://api.douban.com/v2/book/search"
        Alamofire.request(.GET, urlString, parameters: ["tag":"Swift","count":10]).validate().responseJSON { (resp) in
            if let error = resp.result.error{
                print(error)
            }else if let value = resp.result.value,jsonArray = JSON(value)["books"].array{
                for json in jsonArray{
                    let book = Book()
                    book.title = json["title"].string ?? ""
                    book.subtitle = json["subtitle"].string ?? ""
                    book.image = json["image"].string ?? ""
                    self.books.append(book)
                }
                
                self.tableview.reloadData()
            }
            
        }
    }
    
    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableview.dequeueReusableCellWithIdentifier("Cell")!
        let book = books[indexPath.row]
        cell.textLabel?.text = book.title
        cell.detailTextLabel?.text = book.subtitle
        cell.imageView?.kf_setImageWithURL(NSURL(string: book.image) ?? NSURL(),placeholderImage:UIImage(named: "cake") )
        return cell
    }

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return books.count
    }
    
    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        tableview.deselectRowAtIndexPath(indexPath, animated: false)
        let url = books[indexPath.row].image
        self.performSegueWithIdentifier("DetailViewController", sender: url)
    }
    
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if segue.identifier == "DetailViewController"{
            let controller = segue.destinationViewController as! DetailViewController
            controller.url = sender as? String
        }
    }
}

class Book:NSObject{
    var title=""
    var subtitle=""
    var image = ""
}

DetailViewController

import UIKit
import Alamofire
class DetailViewController: UIViewController {

    @IBOutlet weak var imageview: UIImageView!
    @IBOutlet weak var label: UILabel!
    var imagePath = ""
    var url:String!{
        didSet{
            Alamofire.download(.GET, url){temporaryURL, response in
                let fileManager = NSFileManager.defaultManager()
                let directoryURL = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
                let pathComponent = response.suggestedFilename
                self.imagePath=directoryURL.URLByAppendingPathComponent(pathComponent!).path!
                
                if fileManager.fileExistsAtPath(self.imagePath){
                    try!fileManager.removeItemAtPath(self.imagePath)
                }
                
                return directoryURL.URLByAppendingPathComponent(pathComponent!)
                
            }.progress { (bytesRead, totalBytesRead, totalBytesExpectedToRead ) in
                    let progess = Int(Double(totalBytesRead)/Double(totalBytesExpectedToRead) * 100)
                    
                    dispatch_async(dispatch_get_main_queue()) {
                        self.label.text = "\(progess)%"
                    }
            }.response(queue: dispatch_get_main_queue()) { (_, _, _, error)->Void in
                    if let error = error{
                        print(error)
                    }else{
                        self.label.hidden = true
                        self.imageview.image = UIImage(contentsOfFile: self.imagePath)
                    }
            }

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

    }

    @IBAction func tapview(sender: AnyObject) {
        self.dismissViewControllerAnimated(true, completion: nil)
    }
}