stringByAddingPercentEscapesUsin

+(NSString *)strUTF8Encoding:(NSString *)str{
    
    
    return [str stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
   // return [str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
}