Re: Is it safe to assume that viewDidLoad() is only ever called once on iOS 8.0+?
Re: Is it safe to assume that viewDidLoad() is only ever called once on iOS 8.0+?
- Subject: Re: Is it safe to assume that viewDidLoad() is only ever called once on iOS 8.0+?
- From: David Duncan <email@hidden>
- Date: Mon, 19 Dec 2016 09:40:35 -0800
> On Dec 18, 2016, at 2:51 AM, Andreas Falkenhahn <email@hidden> wrote:
>
> I do not use Interface Builder or Storyboards to create my GUI
> but I do it manually. Currently, I'm setting up all controls
> in viewDidLoad() of my UIViewController.
>
> So I'm doing stuff like this in viewDidLoad():
>
> UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
> ...
> [self.view addSubview:button];
>
> The actual positioning is then done in viewDidLayoutSubviews(),
> depending on the device's orientation.
>
> According to my research, iOS versions before v6 purged views
> on low-memory conditions but AFAIU this is no longer done starting
> with v6. My app targets iOS 8.0 and up so can I rely on viewDidLoad()
> being called only once?
>
> The reason why I'm asking is that I retain some controls in
> viewDidLoad() because I need them later. I release those controls
> in dealloc(). Now, if viewDidLoad() could be called more than
> once, I'd leak memory. But since viewDidUnload() is deprecated
> anyway, I think it is safe to assume viewDidLoad() is only called
> once because otherwise Apple would have to provide viewDidUnload()
> as well... but still, I'd be glad if somebody could just confirm
> my observations. Thanks.
Assuming you never set a view controller’s view to nil, it is safe to assume that viewDidLoad is always called no more than once per view controller instance.
>
> --
> Best regards,
> Andreas Falkenhahn mailto:email@hidden
>
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--
David Duncan
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