利用NSXMLParser parse梁朝偉和劉德華

xml檔範例:

<?xml version="1.0" encoding="UTF-8"?>

    <永遠的偶像>

        <名字 name="梁朝偉">

            <音樂>為情所困</音樂>

            <movie>俠骨仁心</movie>

        </名字>

        <名字 name="劉德華">

            <音樂>來生緣</音樂>

            <movie>孤男寡女</movie>

        </名字>

    </永遠的偶像>

</xml>

利用xml檔案初始NSXMLParser物件
NSData *data = [NSData dataWithContentsOfFile:path];

xmlParser = [[NSXMLParser alloc] initWithData:data];

設定delegate，如此才能於NSXMLParserDelegate的method被呼叫時做處理

[xmlParser setDelegate:self];

 呼叫NSXMLParser物件的parse method開始進行parse
 parse method is a block call，做完才return

[xmlParser parse];

[xmlParser release];

以下三個method為我們最常使用的NSXMLParserDelegate method


1. 於遇到XML tag開頭時被呼叫，可取得tag的名稱以及tag裡的attribute

-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict

{

    NSLog(@"didStartElement");

    NSLog(@"elementName %@", elementName);

    for(id key in attributeDict)

    {

        NSLog(@"attribute %@", [attributeDict objectForKey:key]);

    }

}

2. 找到XML tag所包含的內容

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string

{

    NSLog(@"foundCharacters %@", string);

}

3. 於遇到XML tag結尾時被呼叫

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName

{

    NSLog(@"didEndElement");

    NSLog(@"elementName %@", elementName);    

}

測試輸出:

2011-03-26 16:04:46.172 XmlParse[12296:207] didStartElement

2011-03-26 16:04:46.175 XmlParse[12296:207] elementName 永遠的偶像

2011-03-26 16:04:46.177 XmlParse[12296:207] foundCharacters 

        

2011-03-26 16:04:46.178 XmlParse[12296:207] didStartElement

2011-03-26 16:04:46.179 XmlParse[12296:207] elementName 名字

2011-03-26 16:04:46.179 XmlParse[12296:207] attribute 梁朝偉

2011-03-26 16:04:46.180 XmlParse[12296:207] foundCharacters 

            

2011-03-26 16:04:46.181 XmlParse[12296:207] didStartElement

2011-03-26 16:04:46.181 XmlParse[12296:207] elementName 音樂

2011-03-26 16:04:46.182 XmlParse[12296:207] foundCharacters 為情所困

2011-03-26 16:04:46.183 XmlParse[12296:207] didEndElement

2011-03-26 16:04:46.184 XmlParse[12296:207] elementName 音樂

2011-03-26 16:04:46.185 XmlParse[12296:207] foundCharacters 

            

2011-03-26 16:04:46.185 XmlParse[12296:207] didStartElement

2011-03-26 16:04:46.186 XmlParse[12296:207] elementName movie

2011-03-26 16:04:46.187 XmlParse[12296:207] foundCharacters 俠骨仁心

2011-03-26 16:04:46.188 XmlParse[12296:207] didEndElement

2011-03-26 16:04:46.189 XmlParse[12296:207] elementName movie

2011-03-26 16:04:46.190 XmlParse[12296:207] foundCharacters 

        

2011-03-26 16:04:46.191 XmlParse[12296:207] didEndElement

2011-03-26 16:04:46.192 XmlParse[12296:207] elementName 名字

2011-03-26 16:04:46.193 XmlParse[12296:207] foundCharacters 

        

2011-03-26 16:04:46.194 XmlParse[12296:207] didStartElement

2011-03-26 16:04:46.195 XmlParse[12296:207] elementName 名字

2011-03-26 16:04:46.196 XmlParse[12296:207] attribute 劉德華

2011-03-26 16:04:46.196 XmlParse[12296:207] foundCharacters 

            

2011-03-26 16:04:46.197 XmlParse[12296:207] didStartElement

2011-03-26 16:04:46.198 XmlParse[12296:207] elementName 音樂

2011-03-26 16:04:46.198 XmlParse[12296:207] foundCharacters 來生緣

2011-03-26 16:04:46.199 XmlParse[12296:207] didEndElement

2011-03-26 16:04:46.200 XmlParse[12296:207] elementName 音樂

2011-03-26 16:04:46.201 XmlParse[12296:207] foundCharacters 

            

2011-03-26 16:04:46.202 XmlParse[12296:207] didStartElement

2011-03-26 16:04:46.202 XmlParse[12296:207] elementName movie

2011-03-26 16:04:46.203 XmlParse[12296:207] foundCharacters 孤男寡女

2011-03-26 16:04:46.204 XmlParse[12296:207] didEndElement

2011-03-26 16:04:46.204 XmlParse[12296:207] elementName movie

2011-03-26 16:04:46.206 XmlParse[12296:207] foundCharacters 

        

2011-03-26 16:04:46.206 XmlParse[12296:207] didEndElement

2011-03-26 16:04:46.207 XmlParse[12296:207] elementName 名字

2011-03-26 16:04:46.208 XmlParse[12296:207] foundCharacters 

    

2011-03-26 16:04:46.210 XmlParse[12296:207] didEndElement

2011-03-26 16:04:46.212 XmlParse[12296:207] elementName 永遠的偶像