iOS中如何解析 html 的代码

本段在 Objective-C 中解析 html 的代码由 CocoaChina 会员 “月华如水” 分享，希望对开发者们有所帮助

#import "StringChuLi.h"

/*

项目作用：链接网络解析html

*/

@implementation StringChuLi

//访问网页源码

-(NSString *)urlString:(NSString *)value{

NSURL *url = [NSURL URLWithString:value];

NSData *data = [NSData dataWithContentsOfURL:url];

//解决中文乱码,用GBK

NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);

NSString *retStr = [[NSString alloc] initWithData:data encoding:enc];

return retStr;

}

/*

作用:截取从value1到value2之间的字符串

str:要处理的字符串

value1:左边匹配字符串

value2:右边匹配字符串

*/

-(NSString *)str:(NSString *)str value1:(NSString *)value1 value2:(NSString *)value2{

//i:左边匹配字符串在str中的下标

int i;

//j:右边匹配字符串在str1中的下标

int j;

//该类可以通过value1匹配字符串

NSRange range1 = [str rangeOfString:value1];

//判断range1是否匹配到字符串

if(range1.length>0){

//把其转换为NSString

NSString *result1 = NSStringFromRange(range1);

i = [self indexByValue:result1];

//原因:加上匹配字符串的长度从而获得正确的下标

i = i+[value1 length];

}

//通过下标，删除下标以前的字符

NSString *str1 = [str substringFromIndex:i];

NSRange range2 = [str1 rangeOfString:value2];

if(range2.length>0){

NSString *result2 = NSStringFromRange(range2);

j = [self indexByValue:result2];

}

NSString *str2 = [str1 substringToIndex:j];

return str2;

}

//过滤获得的匹配信息的下标

-(int)indexByValue:(NSString *)str{

//使用NSMutableString类，它可以实现追加

NSMutableString *value = [[NSMutableString alloc] initWithFormat:@""];

NSString *colum2 = @"";

int j = 0;

//遍历出下标值

for(int i=1;i<[str length];i++){

NSString *colum1 = [str substringFromIndex:i];

[value appendString:colum2];

colum2 = [colum1 substringToIndex:1];

if([colum2 isEqualToString:@","]){

j = [value intValue];

break;

}

}

[value release];

return j;

}

@end