//.h

//encode

+ (NSString*)encodeString:(NSString*)unencodedString;

//decode

+ (NSString *)decodeString:(NSString*)encodedString;

//.m

//encode

+ (NSString*)encodeString:(NSString*)unencodedString {

// CharactersToBeEscaped = @":/?&=;+!@#$()~',*";

// CharactersToLeaveUnescaped = @"[].";

NSString *encodedString = (NSString *)

CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,(CFStringRef)unencodedString,NULL,(CFStringRef)@"!*'();:@&=+$,/?%#[]",kCFStringEncodingUTF8));

return encodedString;

}

//urldecode

+ (NSString *)decodeString:(NSString*)encodedString {

//NSString *decodedString = [encodedString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding ];

NSString *decodedString  = (__bridge_transfer NSString *)CFURLCreateStringByReplacingPercentEscapesUsingEncoding(NULL,(__bridge CFStringRef)encodedString,CFSTR(""),CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding));

return decodedString;

}