My understanding is this, a diagram I made to visualize the process,

http://drowland.net/iOS%20Class/View%20Controller%20unloading.pdf



On Oct 13, 2011, at 8:02 AM, Fritz Anderson wrote:

> On 12 Oct 2011, at 5:39 PM, Rick Mann wrote:
> 
>> I can't tell from the docs for -viewDidUnload if it is not guaranteed to be 
>> called when cleaning up. It does say that it's called for low-memory 
>> situations, but also says it's called as a counterpart to -viewDidLoad, 
>> which is always called when a view controller is created.
> 
> The docs say specifically: 
>> When a low-memory condition occurs and the current view controller’s views 
>> are not needed, the system may opt to remove those views from memory.
> 
> It doesn't refer to any other scenario, and given that the recommendation is 
> that -viewDidUnload do many of the same releases (+ plus nil-outs) as would 
> be done in -dealloc, I take it that low-memory (and therefore -viewDidUnload) 
> and deallocation are separate paths.
> 
>       — F
> 
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