Kas on võimalik, et üks objekt omab korraga mitmeid viiteid?

Yes, on iOS (both in Swift and Objective-C), an object can have multiple references to it simultaneously. This is a common situation when multiple variables or properties refer to the same class instance. It is important to understand that the management of the object's lifecycle is done through reference counting (ARC — Automatic Reference Counting). The object will exist as long as there is at least one strong reference to it. For example:

class Person {}

let person = Person()  // first strong reference
let anotherReference = person  // second strong reference

Here, person and anotherReference point to the same Person object. The object will only be removed from memory when both references cease to exist or are nulled.