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Re: Appropriate -setWantsLayer: timing
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Re: Appropriate -setWantsLayer: timing


  • Subject: Re: Appropriate -setWantsLayer: timing
  • From: Michael Ash <email@hidden>
  • Date: Wed, 17 Feb 2010 23:01:36 -0500

On Wed, Feb 17, 2010 at 4:23 AM, Keith Duncan <email@hidden> wrote:
>
> On 16 Feb 2010, at 21:40, David Duncan wrote:
>
>>> Calling it in -initWithFrame: is too early and the view fails to 'draw'.
>>
>> If you are creating the view programmatically, -initWithFrame: should be fine. If your loading from a nib, then -awakeFromNib is the appropriate place.
>
> That's actually a more distilled version of my question. When your layer hosting view may be instantiated programatically, or from a NIB; there is no good place that covers both since the -init methods are too early (I haven't needed to test -initWithCoder: yet).
>
> Nor have I determined the boundary condition for which it works afterwards, I suspect it's after the has been placed in the view hierarchy. But if that's the case, does the view hierarchy need to be rooted in a window or can it be floating.
>
> One simple workaround I've been using (but wanted to check for a better solution) is to call -setWantsLayer:YES in -initWithFrame: and layer-back the view's parent in the XIB.

-viewWillMoveToWindow: and -viewDidMoveToWindow can be handy places to
put setup code that needs to run as late as possible, but before the
view actually gets used.

I have not tried them for this particular scenario, though.

Mike
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References: 
 >Appropriate -setWantsLayer: timing (From: Keith Duncan <email@hidden>)
 >Re: Appropriate -setWantsLayer: timing (From: David Duncan <email@hidden>)
 >Re: Appropriate -setWantsLayer: timing (From: Keith Duncan <email@hidden>)

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