Databases
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Postsdbo
PO
 

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    1. POiOS 6 - viewDidUnload migrate to didReceiveMemoryWarning?
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    1. PTAnswer
    1. USCommunity
    1. USapplefreak
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      1. VTUpMod
    1. COI agree that it simply depends upon what was in Devfly's `viewDidUnload`, but I'd be shocked if there's anything that needs to move to `dealloc` as a result of iOS 6. Generally, when we use a view controller and then dismiss/pop it, `viewDidUnload` is never called (it's only used in low memory situations), so hopefully there's no routine cleanup in `viewDidUnload` that they're not also cleaning up in `dealloc`! If anyone is doing this sort of stuff in `viewDidUnload` in lieu of `dealloc`, then they have bigger problems on their hands.
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      1. USRob
    2. COYou are right Rob. I think you use dealloc to remove the observers? I know iOS 6.0 automatically releases viewcontroller's memory image once it has been unloaded but if I want to perform some operation just before my view controller deallocated. For example call unsubscribe method of communication manager so that it decrement it's observers count by one. so what I do in iOS 6.0 is, subscribe observers in intiWithCoder and unsubscribe in dealloc. Is that bad design?
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      1. USapplefreak
    3. COThis is all unrelated to this post, but in that other discussion you reference, the OP clearly didn't understand the purpose of `viewDidUnload`. But in answer to your question, yes, you can this sort of stuff in `dealloc`, but `viewWillDisappear` is probably better. Most importantly, if your communication manager maintains a strong reference to your view controller, then you absolutely should not try to unsubscribe in `dealloc` (because you'll have a strong reference cycle; `dealloc` will never be called). That sort of stuff must be done elsewhere, e.g. `viewWillDisappear`.
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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