Swift简单新闻APP实例

1.利用swift开发一个简单的新闻APP

主要利用IOS的UITableViewController，和UIwebView，再加上HTTP请求返回json数据并解析

2.APP演示

主界面

点击新闻进入详情

下拉列表刷新

3.APPDelegate.swif

//
//  AppDelegate.swift
//  UITableViewControllerDemo
//
//  Created by 赵超 on 14-6-24.
//  Copyright (c) 2014年 赵超. All rights reserved.
//

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
                            
    var window: UIWindow?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
        // Override point for customization after application launch.
        self.window!.backgroundColor = UIColor.whiteColor()
        self.window!.makeKeyAndVisible()
        var root=RootTableViewController()
        var navCtrl=UINavigationController(rootViewController:root)
        self.window!.rootViewController=navCtrl
        
        return true
    }

    func applicationWillResignActive(application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
    }

    func applicationDidEnterBackground(application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    }

    func applicationWillEnterForeground(application: UIApplication) {
        // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
    }

    func applicationDidBecomeActive(application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }

    func applicationWillTerminate(application: UIApplication) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    }


}

4.RootTableViewController.swift

//
//  RootTableViewController.swift
//  UITableViewControllerDemo
//
//  Created by 赵超 on 14-6-24.
//  Copyright (c) 2014年 赵超. All rights reserved.
//

import UIKit

class RootTableViewController: UITableViewController {

    var dataSource = []
    
    var thumbQueue = NSOperationQueue()
    
    let hackerNewsApiUrl = "http://qingbin.sinaapp.com/api/lists?ntype=%E5%9B%BE%E7%89%87&pageNo=1&pagePer=10&list.htm"

    override func viewDidLoad() {
        super.viewDidLoad()

        // Uncomment the following line to preserve selection between presentations
        // self.clearsSelectionOnViewWillAppear = false

        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
        // self.navigationItem.rightBarButtonItem = self.editButtonItem
        
       
        self.tableView!.registerClass(UITableViewCell.self, forCellReuseIdentifier: "cell")
        
        let refreshControl = UIRefreshControl()
        refreshControl.attributedTitle = NSAttributedString(string: "下拉刷新")
        refreshControl.addTarget(self, action: "loadDataSource", forControlEvents: UIControlEvents.ValueChanged)
        self.refreshControl = refreshControl
        
        
        
         loadDataSource()
        
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // #pragma mark - Table view data source

    override func numberOfSectionsInTableView(tableView: UITableView?) -> Int {
        // #warning Potentially incomplete method implementation.
        // Return the number of sections.
        
        return dataSource.count
    }

    override func tableView(tableView: UITableView?, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete method implementation.
        // Return the number of rows in the section.
        
     
        return dataSource.count

    }
    
    func loadDataSource() {
        self.refreshControl.beginRefreshing()
        var loadURL = NSURL.URLWithString(hackerNewsApiUrl)
        var request = NSURLRequest(URL: loadURL)
        var loadDataSourceQueue = NSOperationQueue();
        
        NSURLConnection.sendAsynchronousRequest(request, queue: loadDataSourceQueue, completionHandler: { response, data, error in
            if error {
                println(error)
                dispatch_async(dispatch_get_main_queue(), {
                    self.refreshControl.endRefreshing()
                    })
            } else {
                let json = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
                let newsDataSource = json["item"] as NSArray
                
                var currentNewsDataSource = NSMutableArray()
                for currentNews : AnyObject in newsDataSource {
                    let newsItem = XHNewsItem()
                    newsItem.newsTitle = currentNews["title"] as NSString
                    newsItem.newsThumb = currentNews["thumb"] as NSString
                    newsItem.newsID = currentNews["id"] as NSString
                    currentNewsDataSource.addObject(newsItem)
                    println( newsItem.newsTitle)
                }
                
                dispatch_async(dispatch_get_main_queue(), {
                    self.dataSource = currentNewsDataSource
                    self.tableView.reloadData()
                    self.refreshControl.endRefreshing()
                    })
            }
            })
    }


    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    
        
         let cell = tableView .dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as UITableViewCell
    
        let newsItem = dataSource[indexPath.row] as XHNewsItem
        cell.textLabel.text = newsItem.newsTitle
        cell.imageView.image = UIImage(named :"cell_photo_default_small")
        cell.imageView.contentMode = UIViewContentMode.ScaleAspectFit
        
    
        
        let request = NSURLRequest(URL :NSURL.URLWithString(newsItem.newsThumb))
        NSURLConnection.sendAsynchronousRequest(request, queue: thumbQueue, completionHandler: { response, data, error in
            if error {
                println(error)
                
            } else {
                let image = UIImage.init(data :data)
                dispatch_async(dispatch_get_main_queue(), {
                    cell.imageView.image = image
                    })
            }
            })
        
        
        return cell
    }
    
    override func tableView(tableView: UITableView!, heightForRowAtIndexPath indexPath: NSIndexPath!) -> CGFloat {
        return 80
    }

    // #pragma mark - Segues
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        println("aa")
    }
    
    //选择一行
     override func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!){
        var row=indexPath.row as Int
        var data=self.dataSource[row] as XHNewsItem
        //入栈
        
        var webView=WebViewController()
        webView.detailID=data.newsID
        //取导航控制器,添加subView
        self.navigationController.pushViewController(webView,animated:true)
    }
    

}

5.WebViewController.swift

//
//  WebViewController.swift
//  UITableViewControllerDemo
//
//  Created by 赵超 on 14-6-24.
//  Copyright (c) 2014年 赵超. All rights reserved.
//

import UIKit

class WebViewController: UIViewController {
    
    var detailID = NSString()
    var detailURL = "http://qingbin.sinaapp.com/api/html/"
    var webView : UIWebView?
    
    func loadDataSource() {
        var urlString = detailURL + "(detailID).html"
        var url = NSURL.URLWithString(urlString)
        var urlRequest = NSURLRequest(URL :NSURL.URLWithString(urlString))
        webView!.loadRequest(urlRequest)
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()

        webView=UIWebView()
        webView!.frame=self.view.frame
        webView!.backgroundColor=UIColor.grayColor()
        self.view.addSubview(webView)
        
        loadDataSource()


        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    

    /*
    // #pragma mark - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue?, sender: AnyObject?) {
        // Get the new view controller using [segue destinationViewController].
        // Pass the selected object to the new view controller.
    }
    */

}

6.XHNewsItem.swift

//
//  XHNewsItem.swift
//  UITableViewControllerDemo
//
//  Created by 赵超 on 14-6-24.
//  Copyright (c) 2014年 赵超. All rights reserved.
//

import Foundation

class XHNewsItem {
    var newsTitle = NSString()
    var newsThumb = NSString()
    var newsID = NSString()
}