Ios NSXMLParser:基于另一个元素解析特定元素

我正在使用

NSXMLParser

解析以下XML，但只希望基于XML中找到的唯一元素解析某些元素和属性，然后中止解析

例如，我的XML如下所示：

<?xml version="1.0" encoding="UTF-8"?>
<systems>
<system id="system1">
    <game title="game1">
        <checksums>
            <checksum value="checksumvalue1" />
        </checksums>
        <players>
            <player name="name1" description="description1" />
            <player name="name2" description="description2" />
        </players>
    </game>
</system>

---

谢谢你的帮助

你必须跟踪你是否找到了校验和以及你遇到的所有玩家。您需要一个布尔值

foundGameChecksum

和一个

NSMutableArray*players

。别忘了

players=[[NSMutableArray alloc]init]

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

    if ([elementName isEqualToString:@"checksum"] && [[attributeDict valueForKey:@"value"] isEqualToString:@"checksumvalue1"]) {
        NSString *checksumValue = [attributeDict valueForKey:@"value"];
        NSLog(@"value: %@", checksumValue);

        foundGameChecksum = YES;
        // print players in only one game node that contains the unique checksum value
    } else if(foundGameChecksum && [elementName isEqualToString:@"player"]) {
        [players addObject:[attributeDict valueForKey:@"name"]];
    }
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
    if(foundGameChecksum && [elementName isEqualToString:@"players"]) {
        [parser abortParsing]; // Stop parsing
    }
}

然后在
[parser parse]之后被执行时，您将在
players

即：


有一件事，在找到所有玩家后，我是否需要在哪里中止Parsion？看起来即使找到了玩家并将他们全部添加到数组中，它仍然会解析整个XML我已经编辑了我的答案。我认为在这一步中，玩家加入arraySorry会被打断，引入了一个bug。现在应该修好了。
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict{

    if ([elementName isEqualToString:@"checksum"] && [[attributeDict valueForKey:@"value"] isEqualToString:@"checksumvalue1"]) {
        NSString *checksumValue = [attributeDict valueForKey:@"value"];
        NSLog(@"value: %@", checksumValue);

        foundGameChecksum = YES;
        // print players in only one game node that contains the unique checksum value
    } else if(foundGameChecksum && [elementName isEqualToString:@"player"]) {
        [players addObject:[attributeDict valueForKey:@"name"]];
    }
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
    if(foundGameChecksum && [elementName isEqualToString:@"players"]) {
        [parser abortParsing]; // Stop parsing
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<systems>
    <system id="system1">
        <game title="game1">
            <checksums>
                <checksum value="checksumvalue1" /> <!-- Found. Start adding -->
            </checksums>
            <players>
                <player name="name1" description="description1" /> <!-- Add -->
                <player name="name2" description="description2" /> <!-- Add -->
            </players> <!-- Stop adding -->
        </game>
    </system>
</systems>