> On Apr 5, 2018, at 10:53 AM, James Walker <jam...@frameforge3d.com> wrote: > > I have a generic NSView that contains some subviews, and I'd like to add a > background image. I tried code like this: > > NSImage* backgroundImage = [NSImage imageNamed: @"blueprint controls.png"]; > CALayer* holderLayer = [CALayer layer]; > _throttleHolder.layer = holderLayer; > _throttleHolder.wantsLayer = YES; > holderLayer.zPosition = 4.0f; > holderLayer.contents = backgroundImage; > holderLayer.hidden = NO; > holderLayer.bounds = NSRectToCGRect( _throttleHolder.bounds ); > [holderLayer setNeedsDisplay];
You don’t need to call -setNeedsDisplay here, and it may be what is destroying your content (when a layer displays, its stores the result of drawing in contents – you don’t want that since you are setting the contents directly). Overall however, I think AppKit has an NSView method (something like updateLayer I think) that you want to override to do this. The layer’s geometry should already be set by AppKit and you should not modify it if I recall correctly. Geometry includes things such as center/bounds/frame and hidden. > > But no background image shows up. On the other hand, if I add the line > > holderLayer.backgroundColor = CGColorGetConstantColor( kCGColorWhite ); > > then I get a white background, so apparently the layer is there and capable > of drawing. And yes, I have made sure that backgroundImage is not nil. > > At this point, it probably would have been quicker to just go ahead and > subclass NSView, but I'm curious about what dumb mistake I'm making. > _______________________________________________ > > 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/david.duncan%40apple.com > > This email sent to david.dun...@apple.com -- David Duncan _______________________________________________ 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
