The fourth difference between classes and structs is that classes can have deinitializers – code that gets run when an instance of a class is destroyed.
To demonstrate this, here’s a Person
class with a name
property, a simple initializer, and a printGreeting()
method that prints a message:
class Person {
var name = "John Doe"
init() {
print("\(name) is alive!")
}
func printGreeting() {
print("Hello, I'm \(name)")
}
}
We’re going to create a few instances of the Person
class inside a loop, because each time the loop goes around a new person will be created then destroyed:
for _ in 1...3 {
let person = Person()
person.printGreeting()
}
And now for the deinitializer. This will be called when the Person
instance is being destroyed:
deinit {
print("\(name) is no more!")
}
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