XML是一種自描述的資料交換格式。是一種非常重要的資料交換 格式,多年來一直用於各種計算機語言中。 XML類似HTML,有一對對標籤對,格式比HTML嚴謹,一個a8093152e673feb7aba1828c43532094開始,一個5f557f62ae7ac7a14e0b1cb564790dfc結束.
解析的內容為:
<users> <user id="001"> <name>张三</name> <password>123456</password> <nickname>小张</nickname> <description>1111111111</description> </user> <user id="002"> <name>张三</name> <password>2222222</password> <nickname>小四儿</nickname> <description>李四是个好学生</description> </user> <user id="003"> <name>张三</name> <password>88888888</password> <nickname>小五</nickname> <description>1234567890</description> </user> </users>
事先已將資料讀取並儲存在data中.
建立一個類別,繼承自NSObject,命名為userInfo
@property(nonatomic,copy)NSString *uID; @property(nonatomic,copy)NSString *name; @property(nonatomic,copy)NSString *password; @property(nonatomic,copy)NSString *nickname; @property(nonatomic,copy)NSString *description;
再建立一個類別,同樣繼承自NSObject,命名為userParser ,實作xml檔的讀取.
userParser.h
#import <Foundation/Foundation.h> #import "user.h" @interface userParser : NSObject<NSXMLParserDelegate> //存储信息的数组 @property(nonatomic,retain)NSMutableArray *array; //实例 @property(nonatomic,retain)user *people; //创建字符串保存信息 @property(nonatomic,copy)NSMutableString *buffer; //读取xml文件 -(void)parserWithString:(NSString *)string; @end
userparser.m
#import "userParser.h" @implementation userParser -(void)parserWithString:(NSString *)string { //使用系统XML解析方法 NSXMLParser *parser=[[NSXMLParser alloc]initWithData:[string dataUsingEncoding:NSUTF8StringEncoding]]; //设置代理 parser.delegate=self; //开始解析 [parser parse]; } #pragma mark ---NSXMLParserDelegate--- //开始解析 - (void)parserDidStartDocument:(NSXMLParser *)parser { NSLog(@"it begin"); } //解析结束 - (void)parserDidEndDocument:(NSXMLParser *)parser { NSLog(@"it is over"); for (int i=0; i<_array.count; i++) { user *user=_array[i]; NSLog(@"%@,%@,%@,%@,%@",user.uID,user.name,user.password,user.nickname,user.description); } } //遇到开始标签 //attributeDict标签属性 - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict { if ([elementName isEqualToString:@"users"]) { _array=[[NSMutableArray alloc]init]; } else if ([elementName isEqualToString:@"user"]) { _people=[[user alloc]init]; //<user id="3"> _people.uID=[attributeDict objectForKey:@"id"]; } else if ([elementName isEqualToString:@"name"]) { _buffer=[[NSMutableString alloc]init]; } else if ([elementName isEqualToString:@"password"]) { _buffer=[[NSMutableString alloc]init]; } else if ([elementName isEqualToString:@"nickname"]) { _buffer=[[NSMutableString alloc]init]; } else if ([elementName isEqualToString:@"description"]) { _buffer=[[NSMutableString alloc]init]; } } //结束标签 - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName { if ([elementName isEqualToString:@"name"]) { _people.name=_buffer; } else if ([elementName isEqualToString:@"password"]) { _people.password=_buffer; } else if ([elementName isEqualToString:@"nickname"]) { _people.nickname=_buffer; }else if ([elementName isEqualToString:@"description"]) { _people.description=_buffer; } else if ([elementName isEqualToString:@"user"]) { [_array addObject:_people]; } } //读取内容 - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { //NSCharacterSet字符串结合,取出字符串中的空格 [_buffer appendString:[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]]; }
在viewcontroller中,建立userparser的實例物件,透過parserWithString方法實現資料解析
userParser *uparser=[[userParser alloc]init]; [uparser parserWithString:user];
註:將資料解析與介面顯示分開寫入有助於減低程式的耦合,同時也符合MVC程式模式.
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