Differences between “static var” and “var” in Swift

Question

What is the main difference between \"static var\" and \"var\" in Swift? Can someone explain this difference to me, possibly with a little example?

Answer 1

static var belongs to type itself while var belongs to instance (specific value that is of specific type) of type. For example:

struct Car {
    static var numberOfWheels = 4
    var plateNumber: String
}

Car.numberOfWheels = 3
let myCar = Car(plateNumber: "123456")

All cars has same amount of wheels. An you change it on type Car itself.

In order to change plate number you need to have instance of Car. For example, myCar.