Re: IB_DESIGNABLE - anyone got it to work?
Re: IB_DESIGNABLE - anyone got it to work?
- Subject: Re: IB_DESIGNABLE - anyone got it to work?
- From: Michael David Crawford <email@hidden>
- Date: Tue, 12 May 2015 00:53:51 -0700
I haven't tried it myself but this sounds like a bug in IB rather than
in your own code.
Perhaps you should take a stab at writing a minimal test case, then if
that demonstrates that it really is a bug, file a radar.
On 5/12/15, Roland King <email@hidden> wrote:
>
>> On 12 May 2015, at 14:43, Graham Cox <email@hidden> wrote:
>>
>> I'm exploring the use of the new IB_DESIGNABLE macro to preview a custom
>> view live in IB.
>>
>> It keeps complaining that my view is taking too long to draw, over 200mS,
>> which seems to be a limit built into IB. However, when I measure the time
>> myself for drawing, it's nowhere near this long - 10mS max, typically 2mS.
>> Because of this constant and apparently erroneous complaint, IB doesn't
>> show my custom view. I've even tried to do some minimal drawing (just
>> filling the dirty rect) for just the Interface Builder target, but I get
>> the same problem, so it's pretty clear that the timeout is nothing to do
>> with my drawing.
>>
>> At other times IB complains that the rendering agent "crashed", though
>> it's actually an exception from the bowels of Core Graphics. My usual
>> drawing code never triggers the same exception, only when it's drawn by
>> the IB rendering agent.
>>
>> Has anyone been able to make this work?
>>
>> --Graham
>
> I have been able to make it work but it's not been a trouble-free
> experience. There was at least one version of Xcode I couldn't make it work
> at all. I've had other times that a quit/restart was needed to get it going.
>
> I suspect that this is not your problem but I will mention I have a bug
> report out that the IB render code calls initWithFrame: which isn't required
> in Swift and I hadn't in one case implemented it, so it just crashed, or
> hung or both. You're most-likely in obj-c so that is unlikely to be your
> issue. You could override it anyway just for good measure.
>
> The docs and the WWDC video say the custom control must be in a framework
> but I believe that's not actually true, or no-longer true as of the released
> Xcode 6? There was a note somewhere about this but I can't find it now and
> neither can google.
>
> You can debug these IB designable things. I found that if I was able to get
> the view to enable the Debug Selected Views menu item then it seemed IB was
> mostly happy with the control.
>
> Not entirely helpful I know - I just bashed my head against the brick wall
> for a while until it worked.
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--
Michael David Crawford, Consulting Software Engineer
email@hidden
http://www.warplife.com/mdc/
Available for Software Development in the Portland, Oregon Metropolitan
Area.
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