iOS html 转换为富文本

NSString *text = @"我是谁"

NSData *data = [text dataUsingEncoding:NSUnicodeStringEncoding];        

NSDictionary *options = @{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType};

NSMutableAttributedString *contentText = [[NSMutableAttributedString alloc] initWithData:data options:options documentAttributes:nil error:nil];