XMLParser iPhone SDK

Question

我正在创建一个需要阅读XML file

的iPhone应用

属性

@property (nonatomic, strong) NSString *name;
@property (nonatomic, strong) NSString *fileName;
@property (nonatomic, strong) NSString *description;
@property (nonatomic, strong) NSString *date;
@property (nonatomic, strong) NSString *link;

---

搜索标签（此处仅用于“标题”）

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

    // FIRST TAG XML
    if([elementName isEqualToString:@"title"]){
        // GET DATA FROM XML 
        getData = YES; // getData is a bool which is NO initialy
        NSLog(@"Found");
    }
    else
        NSLog(@"Not Found");

}

---

获取数据

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

    if(getData)
    {
        // CREATION DE L OBJET DEPUIS LE XML
        NSLog(@"This is your desired data = %@",string);
        NSLog(@"Object creation ...");
        Pebkac *peb = [[Pebkac alloc] init];
        NSLog(@"Setup the name ...");
        [peb setName:@"Pebkac"];
        NSLog(@"Small descrption ...");
        [peb setDescription:string];
        [pebkacs addObject:peb];
    }
}

---

结束标记

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

    // XML END TAG
    if ([elementName isEqualToString:@"title"]){
        getData = NO;
    }
}

---

我观察到的错误是，有时它不能获得标签之间的所有文本。

Answer 1

foundChars可以被调用N次。您总是将字符串设置为您到达的字符。你必须一次又一次地附加字符，当你接到endTag电话时，你必须设置结果。

-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
    if(!foundChars)
        foundChars = [[NSMutableString alloc] init];
    [foundChars appendString:string];
}

然后在最后使用它 - 示例是为了适合您的问题而编写的

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
    if(getData)
    {
        // CREATION DE L OBJET DEPUIS LE XML
        NSLog(@"This is your desired data = %@",string);
        NSLog(@"Object creation ...");
        Pebkac *peb = [[Pebkac alloc] init];
        NSLog(@"Setup the name ...");
        [peb setName:@"Pebkac"];
        NSLog(@"Small descrption ...");
        [peb setDescription:foundChars];
        [pebkacs addObject:peb];
    }

    //reset
    foundChars = nil;

    // XML END TAG
    if ([elementName isEqualToString:@"title"]){
        getData = NO;
    }
}

Answer 2

方法

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

每个元素可以多次调用。每次为每个标记调用此方法时，您需要将string附加在一起，然后将其设置在对象中：

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

参考此question/answer，了解如何正确使用NSXMLParser

的简明示例