Objective-C - 如何分別解析XML的屬性？

Question

我正在處理一個應用程序，我在UITableView中使用XML解析。我無法弄清楚我是如何分別分析屬性rok1和rok2。如果我使用[_element isEqualToString: @ "jmeno"]的應用程序效果不錯，但是它在UITableView和rok1和rok2之間顯示給我，並且不想要它。 Thx爲您提供幫助。

還有就是我的解析器代碼：

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

    self.element = elementName; 

    if ([_element isEqualToString:@"rok1"]) 
    { 
     _item = [[NSMutableDictionary alloc] init]; 
     self.nazev = [[NSMutableString alloc] init]; 
     self.definice = [[NSMutableString alloc] init]; 
    } 
} 

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string 
{ 
    if ([self.element isEqualToString:@"nazev"]) 
    { 
     [self.nazev appendString:string]; 
    } 
    else if ([self.element isEqualToString:@"def"]) 
    { 
     [self.definice appendString:string]; 
    } 
} 

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

    if ([elementName isEqualToString:@"rok1"]) 
     { 
     Slova *thisSvatek = [[Slova alloc] initWithName:self.nazev 
               definice:self.definice]; 
     [self.svatkyArray addObject:thisSvatek]; 
    } 
    self.element = nil; 
} 

而且比如我的XML：

<?xml version="1.0" encoding="UTF-8" ?> 
<menu> 
    <rok1> 
     <jmeno> 
     <nazev>Prvni</nazev> 
     <def>blblbla</def> 
     <jmeno> 
     <nazev>Druhy</nazev> 
     <def>blbablabal</def> 
     </jmeno> 
    </rok1> 
    <rok2> 
     <jmeno> 
     <nazev>Prvni</nazev> 
     <def>blblbla</def> 
     </jmeno> 
    </rok2> 
</menu> 

Answer 1

你需要保持你的「狀態」的軌道，你是解析XML文檔。一種簡單的方法是簡單地添加一個布爾屬性，表明您正在處理目標元素「內部」。

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

    self.element = elementName; 

    if ([elementName isEqualToString:@"rok1"]) 
    { 
     self.foundTarget=YES; 
     self.nazev = [[NSMutableString alloc] init]; 
     self.definice = [[NSMutableString alloc] init]; 
    } 
} 

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string 
{ 
    if (self.foundTarget) { 
     if ([self.element isEqualToString:@"nazev"]) 
     { 
      [self.nazev appendString:string]; 
     } 
     else if ([self.element isEqualToString:@"def"]) 
     { 
      [self.definice appendString:string]; 
     } 
    } 
} 

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

    if ([elementName isEqualToString:@"rok1"]) 
    { 
     Slova *thisSvatek = [[Slova alloc] initWithName:self.nazev 
               definice:self.definice]; 
     [self.svatkyArray addObject:thisSvatek]; 
     self.foundTarget=NO; 
    } 
    self.element = nil; 
} 

一個更復雜的方法是建立某種形式的數據結構，如字典，代表您的XML

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

    self.element = elementName; 

    if ([elementName isEqualToString:@"rok1"] || [elementName.isEqualToString:@"rok2"]) 
    { 
     self.nazev = [[NSMutableString alloc] init]; 
     self.definice = [[NSMutableString alloc] init]; 
    } 
} 

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string 
{ 
     if ([self.element isEqualToString:@"nazev"]) 
     { 
      [self.nazev appendString:string]; 
     } 
     else if ([self.element isEqualToString:@"def"]) 
     { 
      [self.definice appendString:string]; 
     } 
} 

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

    if ([elementName isEqualToString:@"rok1"] || [elementName.isEqualToString:@"rok2"]) 
     Slova *thisSvatek = [[Slova alloc] initWithName:self.nazev 
               definice:self.definice]; 
     self.rokDictionary[elementName]=thisSvatek; // self.rokDictionary is an NSMutableDictionary 
    } 
    self.element = nil; 
} 

分離出各種「jmeno」標籤，你需要處理他們didStartElement & didEndElement -

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

    self.element = elementName; 

    if ([elementName isEqualToString:@"rok1"] || [elementName.isEqualToString:@"rok2"]) 
    { 
     self.jmenoArray=[NSMutableArray new]; 
    } 
    else if ([elementName isEqualToString:@"jmeno"]) { 
     self.nazev = [[NSMutableString alloc] init]; 
     self.definice = [[NSMutableString alloc] init]; 
    } 
} 

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string 
{ 
     if ([self.element isEqualToString:@"nazev"]) 
     { 
      [self.nazev appendString:string]; 
     } 
     else if ([self.element isEqualToString:@"def"]) 
     { 
      [self.definice appendString:string]; 
     } 
} 

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

    if ([elementName isEqualToString:@"jmeno"]) { 
     Slova *thisSvatek = [[Slova alloc] initWithName:self.nazev 
               definice:self.definice]; 
     [self.jemnoArray addObject:thisSvatek]; 
    } 
    else if ([elementName isEqualToString:@"rok1"] || [elementName.isEqualToString:@"rok2"]) 

     self.rokDictionary[elementName]=self.jmenoArray; // self.rokDictionary is an NSMutableDictionary 
     self.jmenoArray=nil; 
    } 
    self.element = nil; 
}