get XML format of NSDictionary and send in NSData

I have NSDictionary with BOOL and NSString,

 NSString *enteredText = [[NSString alloc] initWithString:enterTextField.text];
 BOOL switchSelected = switchControl.on;

 NSDictionary *dictionaryToSend = [[NSDictionary alloc] initWithObjectsAndKeys:enteredText, @"text", [NSNumber numberWithBool:switchSelected], @"switch", nil];

I need to make them in XML format and then send them through web socket in NSData format, cause SocketRocket library has method:

// Send a UTF8 String or Data.
- (void)send:(id)data;

I stuck on this question. I found a XMLDictionary library on gitHub but it doesn't help me to solve this question. How should I do this?