加密解密URL

加密：

1 NSString* encodeURL(NSString *string)
2 {
3 NSString *newString = NSMakeCollectable([(NSString *)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)string, NULL, CFSTR(":/?#[]@!$ &'()*+,;="<>%{}|\\^~`"), CFStringConvertNSStringEncodingToEncoding(NSUTF8StringEncoding)) autorelease]);
4 if (newString) {
5 return newString;
6 }
7 return @"";
8 }

解密：

1 NSString* urlDecodeValue(NSString *str)
2 {
3 NSString *result = (NSString *) CFURLCreateStringByReplacingPercentEscapesUsingEncoding(kCFAllocatorDefault, (CFStringRef)str, NULL, kCFStringEncodingUTF8);
4  
5 return [result autorelease];
6 }