Static variable inside of a function in Swift.

gistfile1.swift

func staticInsideFunction() {
    struct Temp { static var hasAnimated = false }
    if Temp.hasAnimated == false {
        // ... do something only on the first function call.
        Temp.hasAnimated = true
    } else {
        // ... do something on all subsequent function calls.
    }
}

any idea how to do this in Swift 3? can't seem to figure it out.

This looks genius. What are examples where you would use this pattern?