encode URL ---- IOS

-(NSString *)encodeURL:(NSString *)urlString

{

    CFStringRef newString = CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)urlString, NULL, CFSTR("!*'();:@&=+@,/?#[]"), kCFStringEncodingUTF8);

    return (NSString *)CFBridgingRelease(newString);

}