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Swift 學習之Using Swift mix and match, network: 寫rss閱讀器
這裏麵使用到第三方庫，因此需要使用mix and match特性。
請大家指出其中的錯誤，謝謝！
rss 閱讀器，很簡單的代碼，隻是為了學習swift語言而寫。
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"
// 難道坐標係統變化了？這麼寫法反麵適配失敗了
//_originX = _isIOS7Version ? 64.0 : 0.0
// 獲取到的屏幕的高度怎麼也隻有self.view的高度，不是整個屏幕的高度了？
_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 擴展String結構體，追加獲取feed緩存路徑的方法
// @author huangyibiao
//
extension String {
// @brief 獲取緩存路徑
// @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 { // 若已經存在，先清除
NSFileManager.defaultManager().removeItemAtPath(path, error: nil)
}
// 歸檔
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 網絡請示類，這裏隻是簡單實現，沒有做緩存處理
// @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="網易Rss"
let addButton = UIButton(frame: CGRect(x: 0, y: 0, width: 50, height: 40))
addButton.setTitle("添加", 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("關於", 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("關於", message: "參考thilong，歡迎學習swift語言，請勿用於商業用途")
}
//
// 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:"網易新聞", url:"https://news.163.com/special/00011K6L/rss_newstop.xml"),
FeedModel(name:"網易科技", url:"https://tech.163.com/special/000944OI/headlines.xml"),
FeedModel(name:"網易NBA", url:"https://sports.163.com/special/00051K7F/rss_sportslq.xml"),
FeedModel(name:"網易英超", url:"https://sports.163.com/special/00051K7F/rss_sportsyc.xml"),
FeedModel(name:"網易娛樂", url:"https://ent.163.com/special/00031K7Q/rss_toutiao.xml"),
FeedModel(name:"網易電影", url:"https://ent.163.com/special/00031K7Q/rss_entmovie.xml"),
FeedModel(name:"網易互聯網", url:"https://tech.163.com/special/000944OI/hulianwang.xml"),
FeedModel(name:"網易IT界", url:"https://tech.163.com/special/000944OI/kejiyejie.xml"),
FeedModel(name:"網易汽車", url:"https://auto.163.com/special/00081K7D/rsstoutiao.xml"),
FeedModel(name:"網易數碼", url:"https://tech.163.com/digi/special/00161K7K/rss_digixj.xml"),
FeedModel(name:"網易筆記本", url:"https://tech.163.com/digi/special/00161K7K/rss_diginote.xml"),
FeedModel(name:"網易手機", url:"https://mobile.163.com/special/001144R8/mobile163_copy.xml"),
FeedModel(name:"網易時尚", url:"https://lady.163.com/special/00261R8C/ladyrss1.xml"),
FeedModel(name:"網易星運", url:"https://lady.163.com/special/00261R8C/ladyrss4.xml"),
FeedModel(name:"網易遊戲", url:"https://game.163.com/special/003144N4/rss_gametop.xml"),
FeedModel(name:"網易旅遊", url:"https://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:"https://3g.163.com/touch/article.html?doc.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!)
}
}
#import "GDataXMLNode.h" #import "JSONKit.h"
11.源代碼：
最後更新：2017-04-03 07:57:02