Re: Appropriate -setWantsLayer: timing
Re: Appropriate -setWantsLayer: timing
- Subject: Re: Appropriate -setWantsLayer: timing
- From: Simon Wolf <email@hidden>
- Date: Wed, 17 Feb 2010 23:07:42 +0000
On 17 Feb 2010, at 09:23, Keith Duncan 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.
Hi Keith,
Whilst I was putting together something recently (it's on my blog is you want to see the code) but ended up with the ability to add the layers in -awakeFromNib because the view will always be defined in advance.
However I essentially ended up having to call -setWantsLayer: on my view and on the parent view as two calls because the parent view didn't always seem to pass the layer-backing on down to my view.
I thought that adding layer-backing in -initWithFrame: worked (you might need to add a layer at the same time) and I think you'll get away with calling it in both -initWithFrame: and in -awakeFromNib without any problems. At the very least you could check in -awakeFromNib to see if the view is already layer-backed and only call setWantsLayer: if it is not.
Simon Wolf
Website: http://www.ottersoftware.com
Twitter: http://www.twitter.com/sgaw
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