Swift 学习Using Swift mix and match, network: 写rss读者

有使用第三方库。因此，需要使用mix and match财产。

请指出错误，谢谢！

rss 阅读器，非常easy的代码。仅仅是为了学习swift语言而写。

1?BaseViewController.swift:

import Foundation
import UIKit

//
// @brief Each controller must directly or indirectly inherit from BaseViewController to
//        configure.
// @author huangyibiao
//
class BaseViewController : UIViewController {
    // use to config ios7 or later and below ios7
    var _originX: CGFloat = 0.0
    var _screenHeight: CGFloat = 480.0
    var _isIOS7Version = true
 
    override func viewDidLoad() {
        super.viewDidLoad()
        
        _isIOS7Version = UIDevice.currentDevice().systemVersion >= "7.0"
        // 难道坐标系统变化了？这么写法反面适配失败了
        //_originX = _isIOS7Version ? 64.0 : 0.0
        // 获取到的屏幕的高度怎么也仅仅有self.view的高度。不是整个屏幕的高度了？
        _screenHeight = UIScreen.mainScreen().bounds.size.height
    }
    
    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        // config navigations
        let dict = [UITextAttributeTextColor: UIColor.whiteColor()]
        self.navigationController.navigationBar.titleTextAttributes = dict
        self.navigationController.navigationBar.barTintColor = UIColor.orangeColor()
    }
}

2. need a model: FeedModel.swift

import Foundation

//
// @brief Feed data model, just stores datas
// @author huangyibiao
//
class FeedModel : NSObject, NSCoding {
    var _name: String?
    var _url:  String?

    
    // designated initializer
    init(name: String?
, url: String?) {
        super.init()
        _name = name
        _url = url
    }
    
    //
    // The following functions are NSCoding protocol methods
    //
    // encode
    func encodeWithCoder(aCoder: NSCoder!) {
        aCoder.encodeObject(_name, forKey: "_name")
        aCoder.encodeObject(_url, forKey: "_url")
    }
    
    // decode
    init(coder aDecoder: NSCoder!) {
        _name = aDecoder.decodeObjectForKey("_name") as? String
        _url = aDecoder.decodeObjectForKey("_url") as? String
    }
}

3. write an extension: Extension.swift

import Foundation
import UIKit

//------------------------------------------------------------------------------------------
// @brief extension UIAlertView, making easily to use
// @author huangyibiao
//
extension UIAlertView {
    // @brief Shows an alert view, default showing with "cancel" and "ok" buttons
    // @param title: non-nil String object, shows the title
    // @param message: non-nil String object, shows the message
    // @return return non-nil UIAlertView object
    class func showAlertView(title: String!, message: String!) -> UIAlertView! {
        // in fact, swift provides UIAlerController to do the same thing
        // in the future, it may be replaced by UIAlertController
        let alert = UIAlertView()
        alert.title = title
        alert.message = message
        alert.addButtonWithTitle("Cancel")
        alert.addButtonWithTitle("Ok")
        alert.show()
        
        return alert
    }
}


//------------------------------------------------------------------------------------------
// @brief 扩展String结构体。追加获取feed缓存路径的方法
// @author huangyibiao
//
extension String {
    // @brief 获取缓存路径
    // @param check: default value is true, meaning that needs to check is exist
    // @return Optional String type, if nil, means no value at all, otherwise, returns path
    //
    static func feedCachePath(isCheck check: Bool = true) -> String?
 {
        let path = NSHomeDirectory() + "/Documents/data"
        if check {
            if NSFileManager.defaultManager().fileExistsAtPath(path) {
                return path
            }
        }
        return path
    }
}

4. need a feed manager: FeedManager.swift

import Foundation

//
// @brief Here FeedManager is a singleton, use to manage feed data objects
// @author huangyibiao
//

// never use this global variable directly, because directly using it may not
// has a value.
// I don't know how to make it invisible outside in swift
var g_sharedFeedManager: FeedManager!

class FeedManager {
    var _dataSource = NSMutableArray() // use to store FeedModel objects
    
    // singleton
    class func sharedFeedManager() -> FeedManager! {
        if g_sharedFeedManager == nil { // no value
            g_sharedFeedManager = FeedManager()
        }
        return g_sharedFeedManager
    }
    
    // designated initializer
    init() {
        
    }
    
    // return the numbers of feed models
    func count() -> Int {
        return _dataSource.count
    }
    
    // add model
    func addFeedModel(feedModel: FeedModel!) {
        // found whether is exist
        for model: AnyObject in _dataSource {
            let feedModelObject = model as FeedModel
            if feedModelObject._name == feedModel._name {
                return
            }
        }
        _dataSource.addObject(feedModel)
        saveAllFeeds()
    }
    
    // remove model
    func removeFeedModel(atIndex index: Int) {
        assert(index >= 0 && index < count(), "out of range in array", file: "Extension.swift", line: 57)
        
        _dataSource.removeObjectAtIndex(index)
        saveAllFeeds() // update local datas
    }
    
    // obtain
    func feedModel(atIndex index: Int) -> FeedModel {
        assert(index >= 0 && index < count(), "out of range in array", file: "Extension.swift", line: 57)
        
        return _dataSource[index] as FeedModel
    }
    
    func saveAllFeeds() {
        let path = String.feedCachePath(isCheck: false)
        if path { // 若已经存在。先清除
            NSFileManager.defaultManager().removeItemAtPath(path, error: nil)
        }
        // 归档
        NSKeyedArchiver.archiveRootObject(_dataSource, toFile: path)
    }
    
    func loadAllFeeds() {
        let path = String.feedCachePath()// default isCheck is true
        if path {
            let feedModels = NSKeyedUnarchiver.unarchiveObjectWithFile(path) as? NSArray
            if feedModels {
                _dataSource.addObjectsFromArray(feedModels)
            }
        }
    }
}

5.need a HttpRequest: HttpRequest.swift

import Foundation

@objc protocol HttpRequestDelegate {
    // @brief when request finished, and will call this delegate method if comforms to
    // @param request: an non-nil HttpRequest object
    // @param downloadedData: you can do something with the parameter,
    //                        which is the data  downloaded from ns service
    @optional func requestFinished(request: HttpRequest!, downloadedData: NSMutableData!)
    
    // @brief fail to download
    @optional func requestFailed(request: HttpRequest!)
}

//
// @brief 网络请示类，这里仅仅是简单实现，没有做缓存处理
// @author huangyibiao
//
class HttpRequest : NSObject, NSURLConnectionDelegate {
    var _delegate: HttpRequestDelegate?
    var _urlString: String?
    var _connection: NSURLConnection?
    var _downloadData: NSMutableData?

    
    init()  {
        super.init()
        _downloadData = NSMutableData()
    }
    
    // begin to request data
    func startRequest(delegate: HttpRequestDelegate?, urlString: String!) {
        cancelRequest() // cancel current request before a new request
        
        _delegate = delegate
        _urlString = urlString
        
        // clear _downloadData
        _downloadData!.resetBytesInRange(NSRange(location: 0, length: _downloadData!.length))
        _downloadData!.length = 0 // update length
        
        var url = NSURL(string: _urlString)
        var request = NSURLRequest(URL: url)
        _connection = NSURLConnection(request: request, delegate: self)
        _connection!.start()
    }
    
    func cancelRequest() {
        if _connection {
            _connection!.cancel()
            _connection = nil
        }
    }
    
    //
    // The following funcs are NSURLConnectionDelegate methods
    // download fail
    func connection(connection: NSURLConnection!, didFailWithError error: NSError!){
        _downloadData!.resetBytesInRange(NSRange(location: 0,length: _downloadData!.length));
        _downloadData!.length = 0;
        
        _delegate?.requestFailed?(self)
    }
    
    // receive data and append to the downloaded data
    func connection(connection: NSURLConnection!, didReceiveData data: NSData!){
        _downloadData!.appendData(data);
    }
    
    // download finished
    func connectionDidFinishLoading(connection: NSURLConnection!){
        _delegate?.requestFinished!(self, downloadedData: _downloadData!);
    }
}

7.write a root controller: RootViewController.swift

import Foundation
import UIKit

class RootViewController : BaseViewController, UITableViewDelegate, UITableViewDataSource {
    var _tableView: UITableView?

    
    override func viewDidLoad() {
        self.title="网易Rss"
        
        let addButton = UIButton(frame: CGRect(x: 0, y: 0, width: 50, height: 40))
        addButton.setTitle("加入", forState: UIControlState.Normal)
        addButton.titleLabel.font = UIFont.systemFontOfSize(12);
        addButton.setTitleColor(UIColor.blackColor(), forState: .Normal);
        addButton.addTarget(self, action: "onAddButtonClicked:", forControlEvents: UIControlEvents.TouchUpInside)
        var addButtonItem = UIBarButtonItem(customView: addButton);
        super.navigationItem.rightBarButtonItem = addButtonItem;
        
        
        var aboutButton = UIButton(frame: CGRect(x: 0,y: 0,width: 50,height: 40))
        aboutButton.setTitle("关于", forState: .Normal)
        aboutButton.titleLabel.font = UIFont.systemFontOfSize(12);
        aboutButton.setTitleColor(UIColor.blackColor(), forState: .Normal);
        aboutButton.addTarget(self, action: "onAboutButtonClicked:", forControlEvents: .TouchUpInside)
        var aboutButtonItem = UIBarButtonItem(customView: aboutButton);
        super.navigationItem.leftBarButtonItem = aboutButtonItem;
        
        _tableView = UITableView(frame: self.view.bounds);
        _tableView!.dataSource = self;
        _tableView!.delegate = self;
        self.view.addSubview(_tableView);
    }
    
    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        _tableView!.reloadData()
    }
    
    //
    // The following are UIButton event methods
    //
    // clicke add button
    func onAddButtonClicked(sender: UIButton!) {
        let rss = FeedRssListViewController()
        self.navigationController.pushViewController(rss, animated: true)
    }
    
    // clicked about button
    func onAboutButtonClicked(sender: UIButton!) {
        // call extension method
        UIAlertView.showAlertView("关于", message: "參考thilong。欢迎学习swift语言，请勿用于商业用途")
    }
    
    //
    // The following are UITableViewDataSource protocol methods
    //
    func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int{
        return FeedManager.sharedFeedManager().count()
    }
    
    func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell!{
        let cellIdentifier = "cellIdentifier" ;
        var cell  = tableView.dequeueReusableCellWithIdentifier(cellIdentifier) as? UITableViewCell;
        if cell == nil {
            cell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: cellIdentifier);
            cell!.selectionStyle = UITableViewCellSelectionStyle.None;
        }
        
        let model = FeedManager.sharedFeedManager().feedModel(atIndex: indexPath.row)
        cell!.textLabel.text = model._name;
        return cell;
    }
    
    //
    // The following are UITableViewDelegate protocol methods
    //
    func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!){
        let model = FeedManager.sharedFeedManager().feedModel(atIndex: indexPath.row)
        let detail = RssDetailViewController(model)
        detail.hidesBottomBarWhenPushed = true
        self.navigationController.pushViewController(detail, animated:true);
    }
}

8.FeedRssListViewController.swift

import Foundation
import UIKit

//
// @brief Rss contents for selected
// @author huangyibiao
//
class FeedRssListViewController : BaseViewController, UITableViewDelegate, UITableViewDataSource {
    var _tableView: UITableView?
    var _dataSources: Array<FeedModel> = [
        FeedModel(name:"网易新闻", url:"http://news.163.com/special/00011K6L/rss_newstop.xml"),
        FeedModel(name:"网易科技", url:"http://tech.163.com/special/000944OI/headlines.xml"),
        FeedModel(name:"网易NBA", url:"http://sports.163.com/special/00051K7F/rss_sportslq.xml"),
        FeedModel(name:"网易英超", url:"http://sports.163.com/special/00051K7F/rss_sportsyc.xml"),
        FeedModel(name:"网易娱乐", url:"http://ent.163.com/special/00031K7Q/rss_toutiao.xml"),
        FeedModel(name:"网易电影", url:"http://ent.163.com/special/00031K7Q/rss_entmovie.xml"),
        FeedModel(name:"网易互联网", url:"http://tech.163.com/special/000944OI/hulianwang.xml"),
        FeedModel(name:"网易IT界", url:"http://tech.163.com/special/000944OI/kejiyejie.xml"),
        FeedModel(name:"网易汽车", url:"http://auto.163.com/special/00081K7D/rsstoutiao.xml"),
        FeedModel(name:"网易数码", url:"http://tech.163.com/digi/special/00161K7K/rss_digixj.xml"),
        FeedModel(name:"网易笔记本", url:"http://tech.163.com/digi/special/00161K7K/rss_diginote.xml"),
        FeedModel(name:"网易手机", url:"http://mobile.163.com/special/001144R8/mobile163_copy.xml"),
        FeedModel(name:"网易时尚", url:"http://lady.163.com/special/00261R8C/ladyrss1.xml"),
        FeedModel(name:"网易星运", url:"http://lady.163.com/special/00261R8C/ladyrss4.xml"),
        FeedModel(name:"网易游戏", url:"http://game.163.com/special/003144N4/rss_gametop.xml"),
        FeedModel(name:"网易旅游", url:"http://travel.163.com/special/00061K7R/rss_hline.xml")
    ]
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.title = "Feed Models"
        
        // config tableview
        _tableView = UITableView(frame: self.view.bounds);
        self.view.addSubview(_tableView);
        _tableView!.dataSource = self
        _tableView!.delegate = self;
    }
    
    //
    // @brief The following funcs are UITableViewDataSource protocol methods
    //
    func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int{
        return _dataSources.count;
    }
    
    func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell!{
        let cellIdentifier = "cellIdentifier" ;
        var cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier) as? UITableViewCell;
        if cell == nil {
            cell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: cellIdentifier);
            cell!.selectionStyle = UITableViewCellSelectionStyle.None;
        }
        let model = _dataSources[indexPath.row] as FeedModel
        cell!.textLabel.text = model._name;
        return cell;
    }
    
    //
    // @brief The following funcs are UITableViewDelegate protocol methods
    //
    func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!){
        let model = _dataSources[indexPath.row] as FeedModel;
        FeedManager.sharedFeedManager().addFeedModel(model)
        self.navigationController.popViewControllerAnimated(true);
    }
}

9.RssDetailViewController.swift

import Foundation
import UIKit

//
// @brief Detail rss content 
// @author huangyibiao
//
class RssDetailViewController : BaseViewController, HttpRequestDelegate {
    var _httpRequest: HttpRequest?
    var _webView: UIWebView?
    var _feedModel: FeedModel?
    
    init(_ feedModel: FeedModel) {
        super.init(nibName: nil, bundle: nil)
        
        _feedModel = feedModel
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.title = _feedModel!._name
        _webView = UIWebView(frame: self.view.bounds)
        self.view.addSubview(_webView)
        
        _httpRequest = HttpRequest()
        _httpRequest!.startRequest(self, urlString: _feedModel!._url)
    }
    
    //
    // @brief The following funcs are HttpRequestDelegate protocol methods
    //
    func requestFinished(request: HttpRequest!, downloadedData: NSMutableData!) {
        let doc = GDataXMLDocument(data: downloadedData, options: 0, error: nil)
        if doc == nil {
            UIAlertView.showAlertView("error", message: "read xml file error")
            return;
        }
        var rootElement = doc.rootElement();
        var titleNode = rootElement.nodeForXPath("/rss/channel/title", error: nil);
        var linkNode = rootElement.nodeForXPath("/rss/channel/link", error: nil);
        var channelNode = rootElement.nodeForXPath("/rss/channel", error: nil);
        var items = doc.nodesForXPath("/rss/channel/item", error:nil);
        var entrysBuilder : NSMutableString = NSMutableString();
        var baseHTMLPath : NSString = NSBundle.mainBundle().pathForResource("FeedEntryList",ofType: "html");
        var finalHTML : NSString = NSString.stringWithContentsOfFile(baseHTMLPath,
            encoding: NSUTF8StringEncoding,error: nil);
        for (var i = 0; i < items.count; i++){
            var item = items[i] as GDataXMLElement;
            var itemTitleNode = item.elementsForName("title")[0] as GDataXMLElement;
            var itemDescriptionNode = item.elementsForName("description")[0] as GDataXMLElement;
            var itemUrlNode : GDataXMLElement = item.elementsForName("guid")[0] as GDataXMLElement;
            
            var entryBuilder : NSMutableString = NSMutableString();
            entryBuilder.appendString("<a href='");
            // link here
            var urlString : NSString! = itemUrlNode.stringValue();
            var stringS = urlString.componentsSeparatedByString("/");
            var finalString : NSString? = stringS[stringS.count - 1] as? NSString;
            if finalString && finalString!.hasSuffix(".html"){
                urlString = NSString(string:"http://3g.163.com/touch/article.html?
docid=");
                var docid : NSString = NSString(string:finalString!.stringByReplacingOccurrencesOfString(".html", withString:""));
                urlString = urlString.stringByAppendingFormat("%@",docid);
            }
            
            
            entryBuilder.appendString(urlString);
            entryBuilder.appendString("'><div class='entry'><div class='entryTitle'>");
            //title here
            entryBuilder.appendString(itemTitleNode.stringValue());
            entryBuilder.appendString("</div><div class='entryDescription'>");
            //description here
            var description : NSString = itemDescriptionNode.stringValue();
            entryBuilder.appendString(description);
            entryBuilder.appendString("</div></div></a>");
            
            entrysBuilder.appendString(entryBuilder);
        }
        finalHTML = finalHTML.stringByReplacingOccurrencesOfString("[[ENTRYLIST]]",
            withString: entrysBuilder);
        
        _webView!.loadHTMLString(finalHTML,baseURL: nil);
    }
    
    // fail to download
    func requestFailed(request: HttpRequest!) {
        println("request failed" + _feedModel!._url!)
    }
}

10.mix and match: SwiftRssReader-Bridging-Header

#import "GDataXMLNode.h"
#import "JSONKit.h"

11.源码：

该样品的源入口