> On 12 May 2015, at 14:43, Graham Cox <graham....@bigpond.com> 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. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
