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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