iOS --- html标签

1.正常的html<>标签转换

如：：：<p>哈哈</p>
-(NSString *)filterHTML:(NSString *)html
{
   NSScanner * scanner = [NSScannerscannerWithString: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
        [scannerscanUpToString:@">"intoString:&text];
       //替换字符
        html = [html stringByReplacingOccurrencesOfString:[NSStringstringWithFormat:@"%@>",text]withString:@""];
    }
    //    NSString * regEx = @"<([^>]*)>";
    //    html = [html stringByReplacingOccurrencesOfString:regEx withString:@""];
   return html;
}

2.和平常不一样的开头和结尾<p&gt这样的，如：

<p>外观方面：国产Jee机，与该发动机匹配的是9速手自一体变速箱。</p><p><br/></p>

这样的就要先转换成正常的<>标签
故用下面方法

#pragma mark -- 转义html中的标签
- (NSString *)HTML:(NSString *)html{
    NSScanner *theScaner = [NSScanner scannerWithString:html];
    NSDictionary *dict = @{@"&amp;":@"&", @"&lt;":@"<", @"&gt;":@">", @"&nbsp;":@"", @"&quot;":@"\"", @"width":@"wid"};
    while ([theScaner isAtEnd] == NO) {
        for (int i = 0; i <[dict allKeys].count; i ++) {
            [theScaner scanUpToString:[dict allKeys][i] intoString:NULL];
            html = [html stringByReplacingOccurrencesOfString:[dict allKeys][i] withString:[dict allValues][i]];
        }
    }
    return html;
}