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!")
}
SPONSORED Take the pain out of configuring and testing your paywalls. RevenueCat's all new Paywall Editor allow you to remotely configure your paywall view without any code changes or app updates.
Sponsor Hacking with Swift and reach the world's largest Swift community!
Link copied to your pasteboard.