Why specify [unowned self] in blocks where you depend on self being there?

Question

I want self to be non-nil and I\'m sure it will be, during the blocks execution. So why explicitly specify [unowned self] ?

object.executeBlock {
    date =         


        

Answer 1

The only time where you really want to use [unowned self] or [weak self] is when you would create a strong reference cycle. A strong reference cycle is when there is a loop of ownership where objects end up owning each other (maybe through a third party) and therefore they will never be deallocated because they are both ensuring that each other stick around.

Do you have a strong reference cycle there?