On May 15, 2013, at 11:50 PM, li shunnian wrote:
> I found even in a very simple painter app, view will refresh whole bounds
> when switching from another app.
This is expected, when your application is placed in the background, all of the
backing stores for its views are discarded to save me
I found even in a very simple painter app, view will refresh whole bounds when
switching from another app.
--
Shunnian
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Not that this answers your question, but as graham eluded to, there aren't a
lot if choices. I'd look into showing a progress indicator or look into tiling.
GL
Please excuse mobile typos
On May 15, 2013, at 6:44 PM, Graham Cox wrote:
>
> On 16/05/2013, at 11:29 AM, li shunnian wrote:
>
>>
On 16/05/2013, at 11:29 AM, li shunnian wrote:
> I implement drawRect of a subclass of UIView. I found view will update whole
> bounds when I switch from another app to myapp. Because I draw a cgimage on
> the view's bounds, it cost lots of time. Are there some properties of view or
> layer t
My app is a painter, the image is used for back buffering. When dragging, I
calculate the points between the previous point and now point, and draw a small
image on the back buffer image. Then update the back buffer image to the view.
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Or even more simply just use a UIImageView.
On May 15, 2013, at 9:36 AM, Kyle Sluder wrote:
> Can you just set the CGImage as the .contents of the view's layer?
>
> --Kyle Sluder
>
> On May 15, 2013, at 3:42 AM, li shunnian wrote:
>
>> Hi all,
>> I implement drawRect of a subclass of UIView.
Can you just set the CGImage as the .contents of the view's layer?
--Kyle Sluder
On May 15, 2013, at 3:42 AM, li shunnian wrote:
> Hi all,
> I implement drawRect of a subclass of UIView. I found view will update whole
> bounds when I switch from another app to myapp. Because I draw a cgimage o
Hi all,
I implement drawRect of a subclass of UIView. I found view will update whole
bounds when I switch from another app to myapp. Because I draw a cgimage on the
view's bounds, it cost lots of time. Are there some properties of view or layer
to make the update rect not to be whole bounds?
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