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Alan Ramos
6,617 PointsParend/Child Relationship
What are some examples of a Parent->Child and Child->Parent relationship?
1 Answer
Rutger Farry
10,722 PointsProbably the most common Parent->child relationship in iOS is the View Controller->View relationship. The View Controller retains a pointer to its view so that it can update it when necessary. Parent-Child relationships are much more common, as they follow from writing encapsulated code. Sometimes a Child->Parent relationship is useful, but usually should be avoided, as this means that your child class must know information about its parent, which can result in a confusing web of dependancies. A better option is to use delegation or notifications, which you should learn about later.
Just remember that parents should maintain a strong reference to their children, while children should use a weak reference to their parent. Failure to observe this will result in memory leaks.