Re: White block at Core Animation Rendering

FROM : Troy Stephens
DATE : Mon Jan 14 20:24:43 2008

On Jan 14, 2008, at 9:35 AM, Thomas Bartelmess wrote:
> Hello i,ve got an object, like that:
>
> @implementation topBar
>
> - (id)initWithFrame:(NSRect)frame {
>    self = [super initWithFrame:frame];
>    if (self) {
>
>    }
>    return self;
> }
>
> - (void)drawRect:(NSRect)rect {
>
>
>      NSGradient* topBarGradient = [[[NSGradient alloc] 
> initWithStartingColor:[NSColor colorWithDeviceRed:0.7 green:0.7 blue:
> 0.7 alpha:1.0] endingColor:[NSColor colorWithDeviceRed:0.9 green:0.9 
> blue:0.9 alpha:1.0]] autorelease];
>
>     NSRect rect1 = NSMakeRect ( 0,0,[self bounds].size.width,30 );
>     [topBarGradient drawInRect:rect1 angle:90];
>
> }
>
> when turn on Core Animation Rendering (setWantsLayer:true) there is 
> no gardient, just a white box


That's strange.  What you describe works just fine for me.  (The 
gradient draws the same, whether the view is layer-backed or not, as 
it should.)

Is there anything else involved in the implementation of the view that 
you omitted from this code sample?  I don't know of any problems that 
would cause the symptom you're seeing, but if you can provide a test 
project that reproduces the problem, by all means please send me a copy.

Thanks,
Troy

--
Troy Stephens
Cocoa Frameworks
Apple, Inc.