mark:
NSScanner是一个类，用于在字符串中扫描指定的字符，尤其是把它们翻译/转换为数字和别的字符串。
http://blog.csdn.net/likendsl/article/details/7974761
- (NSString *)filterHTML:(NSString *)html
{
NSScanner * scanner = [NSScanner scannerWithString:html];
NSString * text = nil;
while([scanner isAtEnd]==NO)
{
[scanner scanUpToString:@"<" intoString:nil];
[scanner scanUpToString:@">" intoString:&text];
html = [html stringByReplacingOccurrencesOfString:[NSString stringWithFormat:@"%@>",text] withString:@""];
}
return html;
}
scanner 感觉是对遍历字符的封装，但是又不完全，要借助while
