Re: problem getting CALayer to draw an image
Re: problem getting CALayer to draw an image
- Subject: Re: problem getting CALayer to draw an image
- From: Rob Petrovec <email@hidden>
- Date: Thu, 05 Apr 2018 12:03:44 -0600
If you take out the setNeedsDisplay it draws ok.
—Rob
> On Apr 5, 2018, at 11:53 AM, James Walker <email@hidden> 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];
>
> 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.
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