2014
Mar
22

Objective-C XML Parse

Tags:
簡中版

要 Parse xml 之前，要先下載別人寫好的 XMLParser Library，這裡我使用的是「xml parse」，使用方式還算簡單，這裡我先定義一個 XML String ，然後用 dictionaryForXMLString 將 XML 讀進來，範例如下。

xml parse 
  1. #import "xmlReader.h";
  2.  
  3. NSString *xmlContent = [NSString stringWithFormat:@"<?xml version="1.0" encoding="UTF-8" ?>"
  4.                         "<xml>"
  5.                         "<title>IOS Tutorial</title>"
  6.                         "<desc>IOS desc</desc>"
  7.                         "</xml>"];
  8. NSDictionary *dics=[[NSDictionary alloc] 
  9.      initWithDictionary:[XMLReader dictionaryForXMLString:xmlContent error:nil]
  10. ];
  11.     
  12. NSLog(@"dics is %@",dics);

將 dics 物件輸出的結果如下，可以清楚的看到其資料結構。

result 
  1. dics is {
  2.     xml =     {
  3.         desc =         {
  4.             text = "IOS desc";
  5.         };
  6.         title =         {
  7.             text = "IOS Tutorial";
  8.         };
  9.     };
  10. }

上述的範例，只是直接將 NSDictionary 輸出至螢幕，接下來我要取得 titile 的這個 tag 的值。

Example 
  1. NSArray *tableDicsArray=[dics valueForKey:@"xml"];        
  2. NSLog(@"data =  %@", [[tableDicsArray valueForKey:@"title"] valueForKey:@"text"]);
  3. //output: IOS Tutorial

接著來試一下 Array 的處理，假如我的 XML 格式包含多項的 List，我們一樣可以用 Array[0], Array[1] 的方式取得資料。

XML Array 
  1. NSString *xmlContent = [NSString stringWithFormat:@"<?xml version="1.0" encoding="UTF-8" ?>"
  2.                             "<xml>"
  3.                             "<item><title>IOS Tutorial</title>"
  4.                             "<desc>IOS desc</desc></item>"
  5.                             "<item><title>IOS Tutorial2</title>"
  6.                             "<desc>IOS desc2</desc></item>"
  7.                             "</xml>"];
  8. NSDictionary *dics=[[NSDictionary alloc]initWithDictionary:[XMLReader dictionaryForXMLString:xmlContent error:nil]];
  9.     
  10. NSArray *tableDicsArray=[[dics valueForKey:@"xml"] valueForKey:@"item"];
  11.     
  12. NSLog(@"data =  %@", [[tableDicsArray[1] valueForKey:@"title"] valueForKey:@"text"]);

RSS Content Parse

這是一個簡單的 RSS 格式，與 Parse 範例。

Example 
  1. NSString *xmlContent = [NSString stringWithFormat:@"<?xml version="1.0" encoding="UTF-8" ?>"
  2.     "<rss version="2.0">"
  3.     "<title>Puritys Program Blog</title>"
  4.     "<channel>"
  5.     "<title>Puritys Program Blog</title>"
  6.     "<link>http://www.puritys.me/rss/blog</link>"
  7.     "<description></description>"
  8.     "<language>zh-tw</language>"
  9.     "<pubDate>Sat, 22 Mar 2014 23:10:03 +0800</pubDate>"
  10.     "<copyright>www.ewebsite.com.tw</copyright>"
  11.     "<generator>Puritys</generator>"
  12.     "<item>"
  13.     "<title>Javascript Hoisting 與 Closure</title>"
  14.     "<link>http://www.puritys.me/docs-blog/article-242</link>"
  15.     "<description>content</description>"
  16.     "<pubDate>Sat, 22 Mar 2014 00:23:18 +0800</pubDate>"
  17.     "<guid></guid>"
  18.     "</item>"
  19.     "<item>"
  20.     "<title>PHP 判斷是否為 Command Line 的方式</title>"
  21.     "<link>http://www.puritys.me/docs-blog/article-241</link>"
  22.     "<description>content</description>"
  23.     "<pubDate>Sat, 22 Mar 2014 00:23:18 +0800</pubDate>"
  24.     "<guid></guid>"
  25.     "</item>"
  26.     "</channel>"
  27.     "</rss>"];
  28.     
  29.     NSDictionary *dics=[[NSDictionary alloc]initWithDictionary:[XMLReader dictionaryForXMLString:xmlContent error:nil]];
  30.     
  31.     NSArray *tableDicsArray=[[[dics valueForKey:@"rss"] valueForKey:@"channel"] valueForKey:@"item"];

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