How to print String in Xcode/Swift

To Print String in xCode:

I am reading a TextField String from xib. (labelName is the name of Label);

Objective C:

NSString *userId = [[NSString alloc] initWithString:labelName.text];

printf("String is %s", [userId UTF8String]);

[userId release];

Swift:

var userId = labelName.text

print(userId?.utf8)