NSString去掉换行符和空白字符

headerData = [headerData stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];  //去除掉首尾的空白字符和换行字符

       headerData = [headerData stringByReplacingOccurrencesOfString:@"\r" withString:@""];

       headerData = [headerData stringByReplacingOccurrencesOfString:@"\n" withString:@""];

如此即可。