A retain cycle is a situation in reference-counted memory management when two (or sometimes more) objects have strong references to each other. Normally, objects are destroyed when their reference count reaches zero, and the references they hold are released at that time. In a cycle, each object keeps the other alive, and neither will be destroyed unless the cycle is deliberately broken.
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Retain Cycle: "Parent-Child"
"A common use case for the weak attribute is parent-child data structures. By convention, the parent object should maintain a strong reference with it’s children, and the children should store a weak reference back to the parent. Weak references are…
Chenya Zhang
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