iPhone读取网页内容乱码解决方案

读取的中文网页编码集是gb2312，进行如下转换可正常显示中文：

NSString *urlStr="your url";

NSURL *url = [NSURL URLWithString:urlStr];

NSData *data = [NSData dataWithContentsOfURL:url];

NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);

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