Kuidas saab eemaldada tsüklilised viited mäluhalduses, et vältida lekked?

Cyclic links occur when two or more objects refer to each other, which prevents automatic memory release, especially when using reference counting.

In iOS (Objective-C/Swift), to prevent memory leaks caused by cyclic links, the following are used:

• Weak references (weak) — do not increase the reference count, automatically set to nil when the object is deallocated.
• Unowned references (unowned) — do not increase the count, but are not set to nil, used when the object is guaranteed to exist.

For example, in Swift:

class A {
    var b: B?
}

class B {
    weak var a: A?  // weak reference to avoid cycle
}

Using weak or unowned breaks the cycle, allowing ARC to properly deallocate objects and prevent memory leaks.