iOS 过滤html标签

+ (NSString*)filterHTML:(NSString*)html {
    
    if(html.length<=0) {
        
        return@"";
        
    }
    NSString*emspStr1 =@" ";
    
    html = [html stringByReplacingOccurrencesOfString:emspStr1 withString:@"  "];

    NSString* regEx =@" ";
    
    html = [html stringByReplacingOccurrencesOfString:regEx withString:@" "];
    
    NSString* regEx1 =@"
";
    html = [html stringByReplacingOccurrencesOfString:regEx1 withString:@"\n"];
    
    NSString* regEx2 =@"
";
    
    html = [html stringByReplacingOccurrencesOfString:regEx2 withString:@"\n"];
    
    NSString* regEx3 =@"
";
    
    html = [html stringByReplacingOccurrencesOfString:regEx3 withString:@"\n"];
    
    NSRegularExpression *regularExpretion=[NSRegularExpression regularExpressionWithPattern:@"<[^>]*>|" options:0 error:nil];
    
    html = [regularExpretion stringByReplacingMatchesInString:html options:NSMatchingReportProgress range:NSMakeRange(0, html.length) withTemplate:@""];
    //    NSScanner * scanner = [NSScanner scannerWithString:html];
    
    //    NSString * text = nil;
    
    //    while([scanner isAtEnd]==NO)
    
    //    {
    
    //        //找到标签的起始位置
    
    //        [scanner scanUpToString:@"<" intoString:nil];
    
    //        //找到标签的结束位置
    
    //        [scanner scanUpToString:@">" intoString:&text];
    
    //        //替换字符
    
    //        html = [html stringByReplacingOccurrencesOfString:[NSString stringWithFormat:@"%@>",text] withString:@""];
    
    //    }
   
    return[self flattenHTML:html];

}

// 过滤后台返回字符串中的标签

+ (NSString*)flattenHTML:(NSString*)html {
    
    NSScanner*theScanner;
    
    NSString*text =nil;
    
    theScanner = [NSScanner scannerWithString:html];
    while([theScanner isAtEnd] ==NO) {
        // find start of tag
        [theScanner scanUpToString:@"<" intoString:NULL] ;
        
        // find end of tag
        
        [theScanner scanUpToString:@">" intoString:&text] ;
        
        // replace the found tag with a space
        
        //(you can filter multi-spaces out later if you wish)
        
        html = [html stringByReplacingOccurrencesOfString:[NSString stringWithFormat:@"%@>", text] withString:@"/n"];
    }

    //    MidStrTitle = html;
    
    return html;
    
}