> On Feb 24, 2016, at 4:08 AM, Charles Jenkins <[email protected]> wrote: > > Good tip! Thanks, Dave and Quincey. I was pretty sure the problem was > something embarrassingly basic. > > The next step is to redesign the CircleOverlayView to fill its view with > black except for the center of the circle. I already learned that filling the > view with black and then filling the circle with clearColor() doesn’t work! > My guess is, you do this by adding a mask layer; but you probably don’t > redraw the mask in drawRect(), hm? It should never need to be refreshed > unless the bounds change. > > Assuming I can figure out how to make a mask layer, what is the correct way > to monitor for a bounds change in order to recreate the mask?
You can’t fill with clear color with normal blending because clear color has 0 alpha. You can however fill it with the copy blend mode. > > -- > > Charles > > On February 24, 2016 at 03:16:00, David Duncan ([email protected] > <mailto:[email protected]>) wrote: > >> >> > On Feb 23, 2016, at 7:17 PM, Quincey Morris >> > <[email protected]> wrote: >> > >> > On Feb 23, 2016, at 18:50 , Charles Jenkins <[email protected]> wrote: >> >> >> >> I draw based on the overlay view’s frame, NOT based on the rect that gets >> >> passed in to drawRect(). I must not understand what that parameter is >> >> for. >> > >> > From the UIView documentation for ‘drawRect’: >> > >> >> The portion of the view’s bounds that needs to be updated. The first time >> >> your view is drawn, this rectangle is typically the entire visible bounds >> >> of your view. However, during subsequent drawing operations, the >> >> rectangle may specify only part of your view. >> > >> > >> > So, yes, your code is right now. :) >> > >> >> Its almost right – drawing should be done based on the bounds not the frame >> (this will be an issue if you either use the frame.origin or if you >> transform the view). >> >> > _______________________________________________ >> > >> > Cocoa-dev mailing list ([email protected]) >> > >> > 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/david.duncan%40apple.com >> > >> > This email sent to [email protected] >> >> -- >> David Duncan -- David Duncan _______________________________________________ Cocoa-dev mailing list ([email protected]) 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 [email protected]
