前言
XML解析是数据解析的一种常见形式，有时候要把XML转换成对应的形式是一种很麻烦的事情，特别是在使用iOS原生代码时，尤其明显。小编在这里分享一个小小的类文件可以解决大家的麻烦，可以把XML转换成字典(NSDictionary)或者JSON字符串。最下方有类文件的下载地址。
使用方法举例
NSString *str = [SskyXMLParser jsonStringForXMLData:data error:error];
NSLog(@"%@",str);
类文件的.h文件如下
#import <Foundation/Foundation.h>
enum {
SskyXMLParserOptionsProcessNamespaces = 1 << 0, // 指定接收器呈现命名空间和指定的标签名称
SskyXMLParserOptionsReportNamespacePrefixes = 1 << 1, // 指定接收器呈现命名空间的范围
SskyXMLParserOptionsResolveExternalEntities = 1 << 2, // 指定接收器呈现外部实体的声明
};
typedef NSUInteger SskyXMLParserOptions;
@interface SskyXMLParser : NSObject
/**
NSData格式的XML转换成字典
@param data NSData格式的XML
@param error 错误码
@return 字典
*/
+ (NSDictionary *)dictionaryForXMLData:(NSData *)data error:(NSError *)error;
/**
NSString格式的XML转换成字典
@param string NSString格式的XML
@param error 错误码
@return 字典
*/
+ (NSDictionary *)dictionaryForXMLString:(NSString *)string error:(NSError *)error;
/**
NSData格式的XML按照指定的形式转换成字典
@param data NSData格式的XML
@param options 指定的形式
@param error 错误码
@return 字典
*/
+ (NSDictionary *)dictionaryForXMLData:(NSData *)data options:(SskyXMLParserOptions)options error:(NSError *)error;
/**
NSString格式的XML按照指定的形式转换成字典
@param string NSString格式的XML
@param options 指定的形式
@param error 错误码
@return 字典
*/
+ (NSDictionary *)dictionaryForXMLString:(NSString *)string options:(SskyXMLParserOptions)options error:(NSError *)error;
/**
NSData格式的XML转换成JSON字符串
@param data NSData格式的XML
@param error 错误码
@return JSON字符串
*/
+ (NSString *)jsonStringForXMLData:(NSData *)data error:(NSError *)error;
/**
NSString格式的XML转换成JSON字符串
@param string NSString格式的XML
@param error 错误码
@return JSON字符串
*/
+ (NSString *)jsonStringForXMLString:(NSString *)string error:(NSError *)error;
/**
NSData格式的XML按照指定的形式转换成JSON字符串
@param data NSData格式的XML
@param options 指定的形式
@param error 错误码
@return JSON字符串
*/
+ (NSString *)jsonStringForXMLData:(NSData *)data options:(SskyXMLParserOptions)options error:(NSError *)error;
/**
NSString格式的XML按照指定的形式转换成JSON字符串
@param string NSString格式的XML
@param options 指定的形式
@param error 错误码
@return JSON字符串
*/
+ (NSString *)jsonStringForXMLString:(NSString *)string options:(SskyXMLParserOptions)options error:(NSError *)error;
@end
类文件的.m文件如下
#import "SskyXMLParser.h"
NSString *const kSskyXMLParserNodeKey = @"nodeValue";
@interface SskyXMLParser()<NSXMLParserDelegate>
//字典堆栈数组
@property (nonatomic, strong) NSMutableArray *dictionaryStack;
//文本
@property (nonatomic, strong) NSMutableString *textInProgress;
//错误
@property (nonatomic, strong) NSError *errorPointer;
@end
@implementation SskyXMLParser
#pragma mark - Public methods
+ (NSDictionary *)dictionaryForXMLData:(NSData *)data error:(NSError *)error
{
SskyXMLParser *xmlParser = [[SskyXMLParser alloc]initWithError:error];
NSDictionary *rootDictionary = [xmlParser objectWithData:data options:0];
return rootDictionary;
}
+ (NSDictionary *)dictionaryForXMLString:(NSString *)string error:(NSError *)error
{
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
return [SskyXMLParser dictionaryForXMLData:data error:error];
}
+ (NSDictionary *)dictionaryForXMLData:(NSData *)data options:(SskyXMLParserOptions)options error:(NSError *)error
{
SskyXMLParser *xmlParser = [[SskyXMLParser alloc]initWithError:error];
NSDictionary *rootDictionary = [xmlParser objectWithData:data options:options];
return rootDictionary;
}
+ (NSDictionary *)dictionaryForXMLString:(NSString *)string options:(SskyXMLParserOptions)options error:(NSError *)error
{
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
return [SskyXMLParser dictionaryForXMLData:data options:options error:error];
}
+ (NSString *)jsonStringForXMLData:(NSData *)data error:(NSError *)error
{
NSDictionary *dic = [SskyXMLParser dictionaryForXMLData:data error:error];
return [self dictionaryTransformedIntoJSONWithDictionary:[dic mutableCopy]];
}
+ (NSString *)jsonStringForXMLString:(NSString *)string error:(NSError *)error
{
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
return [SskyXMLParser jsonStringForXMLData:data error:error];
}
+ (NSString *)jsonStringForXMLData:(NSData *)data options:(SskyXMLParserOptions)options error:(NSError *)error
{
NSDictionary *dic = [SskyXMLParser dictionaryForXMLData:data options:options error:error];
return [self dictionaryTransformedIntoJSONWithDictionary:[dic mutableCopy]];
}
+ (NSString *)jsonStringForXMLString:(NSString *)string options:(SskyXMLParserOptions)options error:(NSError *)error
{
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
return [SskyXMLParser jsonStringForXMLData:data options:options error:error];
}
#pragma mark 字典转JSON方法
+ (NSString *)dictionaryTransformedIntoJSONWithDictionary:(NSMutableDictionary *)dic
{
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:nil];
NSString *str = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];
return str;
}
#pragma mark - 解析
/**
初始化
@param error 错误制作
@return self
*/
- (instancetype)initWithError:(NSError *)error
{
if (self == [super init]) {
self.errorPointer = error;
}
return self;
}
/**
解析成字典
@param data 数据
@param options 类型
@return 字典
*/
- (NSDictionary *)objectWithData:(NSData *)data options:(SskyXMLParserOptions)options
{
// 每次处理前先重新初始化
self.dictionaryStack = [NSMutableArray array];
self.textInProgress = [NSMutableString string];
// 用新字典初始化堆栈
[self.dictionaryStack addObject:[NSMutableDictionary dictionary]];
// 解析XML
NSXMLParser *parser = [[NSXMLParser alloc]initWithData:data];
// 解析类型
[parser setShouldProcessNamespaces:(options & SskyXMLParserOptionsProcessNamespaces)];
[parser setShouldReportNamespacePrefixes:(options & SskyXMLParserOptionsReportNamespacePrefixes)];
[parser setShouldResolveExternalEntities:(options & SskyXMLParserOptionsResolveExternalEntities)];
// 绑定代理
parser.delegate = self;
// 开始解析
BOOL isSuccess = [parser parse];
// 判断是否成功
if (isSuccess) {
NSDictionary *resultDict = [self.dictionaryStack firstObject];
return resultDict;
}
return nil;
}
#pragma mark - NSXMLParserDelegate methods
//文档开始读取
- (void)parserDidStartDocument:(NSXMLParser *)parser
{
}
//解析标签开始
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary<NSString *,NSString *> *)attributeDict
{
// 获取当前字典
NSMutableDictionary *parentDict = [self.dictionaryStack lastObject];
// 创建子字典
NSMutableDictionary *childDict = [NSMutableDictionary dictionary];
// 拼接字典
[childDict addEntriesFromDictionary:attributeDict];
// 判断存不存在键值对
id existingValue = [parentDict objectForKey:elementName];
// 存在说明该键值对为数组
if (existingValue) {
NSMutableArray *array = nil;
// 判断该键值对的数组是否存在
if ([existingValue isKindOfClass:[NSMutableArray class]]) {
array = (NSMutableArray *)existingValue;
}else
{
array = [NSMutableArray array];
[array addObject:existingValue];
// 用新的数组替换旧的
[parentDict setObject:array forKey:elementName];
}
// 数组中添加新的子字典
[array addObject:childDict];
}else
{
// 不存在说明只是普通的键值对
[parentDict setObject:childDict forKey:elementName];
}
// 更新堆栈数组
[self.dictionaryStack addObject:childDict];
}
//获取标签对应的数据
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
[self.textInProgress appendString:string];
}
//解析标签结束
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
NSMutableDictionary *dictInProgress = [self.dictionaryStack lastObject];
if (self.textInProgress.length > 0) {
NSString *trmmedString = [self.textInProgress stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
[dictInProgress setObject:[trmmedString mutableCopy] forKey:kSskyXMLParserNodeKey];
self.textInProgress = [NSMutableString string];
}
[self.dictionaryStack removeLastObject];
}
//文档结束读取
- (void)parserDidEndDocument:(NSXMLParser *)parser
{
}
//遇到错误时停止解析
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError
{
self.errorPointer = parseError;
}
@end
希望这篇文章对各位看官有所帮助，类文件下载地址：类文件，对支持小编的看官们表示感谢。
