class User {
var name: String
var phone: Phone?
init(name: String) {
self.name = name
}
deinit {
print("\(name) deinit")
}
}
class Phone {
var name: String
unowned var owner: User?
init(name: String) {
self.name = name
}
deinit {
print("\(name) deinit")
}
}
var u: User?
u = User(name: "linhuadong")
u!.phone = Phone(name: "iPhone13 Pro")
u = nil