how to toggle the value of a int variable

I want to use a toggle to change the value of int var punch card from 0 to 1. I am pretty sure there is a way to alternate this. I know it uses the : but I have forgotten it. It would also be cool if you could alternate between 0 1 2. I would think that is pretty easy once you get the 0 and 1 to work.

 var punchCard = 0

        @objc func memephis(){
        punchCard : 0: 1
        
    }

There are a couple of ways you can combat your issue. You could use a Boolean value & get it's integer value as they can be converted to 0 (false) or 1 (true).

var punchCard: Bool = true // 1
punchCard.toggle() // Will change between the value
print(punchCard.intValue) // 0

extension Bool {
    var intValue: Int {
        return self ? 1 : 0
    }
}

However you could too use a ternary-operator.

var punchCard = 0

func memephis() {
   punchCard = punchCard == 0 ? 1 : 0
}