Objective-C学习之解析XML
通过soap请求webservice时，返回的数据是XML类型，有时候也需要解析本地的xml数据等，苹果自带类NSXMLParser解析xml还是很方便的，简单轻便
本文以解析本地XML为例，网络获取到的返回值只需转换成NSData型，解析是同理
需要解析的xml文件如下，users.xml
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<?xml version="1.0" encoding="UTF-8"?>
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<AllUsers>
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<message>用户信息</message>
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<user>
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<name>芳仔小脚印</name>
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<age>10</age>
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<school>JiangSu University</school>
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</user>
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<user>
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<name>毒虫</name>
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<age>22</age>
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<school>NanJing University</school>
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</user>
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<user>
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<name>女神</name>
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<age>23</age>
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<school>HongKong University</school>
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</user>
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</AllUsers>
我们用一个数组来存放，最终数据结构为
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(
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{
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message = "用户信息";
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},
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{
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age = 10;
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name = "芳仔小脚印";
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school = "JiangSu University";
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},
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{
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age = 22;
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name = "毒虫";
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school = "NanJing University";
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},
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{
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age = 23;
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name = "女神";
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school = "HongKong University";
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}
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)
解析步骤
一、声明代理 NSXMLParserDelegate
二、解析
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// 遇到节点message和user时作为一个字典存放
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NSArray *keyElements = [[NSArray alloc] initWithObjects:@"message",@"user", nil];
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// 需要解析的字段
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NSArray *rootElements = [[NSArray alloc] initWithObjects:@"message",@"name",@"age",@"school", nil];
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// 获取xml文件的路径
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NSString *xmlPath = [[NSBundle mainBundle] pathForResource:@"users" ofType:@"xml"];
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// 转化为Data
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NSData *data = [[NSData alloc] initWithContentsOfFile:xmlPath];
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// 初始化
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NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithData:data];
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// 代理
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xmlParser.delegate = self;
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// 开始解析
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BOOL flag = [xmlParser parse];
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if (flag) {
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NSLog(@"解析成功");
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}
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else{
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NSLog(@"解析出错");
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}
中间变量，在.m的interface的中定义
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NSString *currentElement;
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NSString *currentValue;
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NSMutableDictionary *rootDic;
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NSMutableArray *finalArray;
代理方法
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#pragma - mark 开始解析时
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-(void)parserDidStartDocument:(NSXMLParser *)parser
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{
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// 用数组存储每一组信息
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finalArray = [[NSMutableArray alloc] init];
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}
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#pragma - mark 发现节点时
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-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
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{
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for(NSString *key in self.keyElements){
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if ([elementName isEqualToString:key]) {
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// 关键节点开始时，初始化一个字典来存放值
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rootDic = nil;
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rootDic = [[NSMutableDictionary alloc] initWithCapacity:0];
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}
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else {
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for(NSString *element in self.rootElements){
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if ([element isEqualToString:element]) {
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currentElement = elementName;
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currentValue = [NSString string];
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}
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}
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}
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}
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}
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#pragma - mark 发现节点值时
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-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
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{
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if (currentElement) {
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currentValue = string;
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[rootDic setObject:string forKey:currentElement];
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}
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}
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#pragma - mark 结束节点时
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-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
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{
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if (currentElement) {
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[rootDic setObject:currentValue forKey:currentElement];
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currentElement = nil;
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currentValue = nil;
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}
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for(NSString *key in self.keyElements){