Getting started with Core Animation

[Graham Cox]

Hi all,

I'm looking at Core Animation for the first time. Having a bit of  
trouble getting started with the simplest set-up I can imagine.

Goal - to add a single CALayer in my view so I can see it. Then, try  
some simple animations. I've tried a few different things but I just  
can't see any visible trace of my layer. Here's the code, part of my  
custom view (actually, almost all of it):

- (id)  initWithFrame:(NSRect)frame
{
    self = [super initWithFrame:frame];
    if (self)
        {
                CALayer* rootLayer = [CALayer layer];
                
                theLayer = [CALayer layer];
                
                CGRect          frame = {10,10,110,150};
                CGColorRef      bk = CGColorCreateGenericRGB( 0.5, 0.5, 0, 1.0 
);
                
                [theLayer setCornerRadius:10.0];
                [theLayer setBorderWidth:4.0];
                [theLayer setFrame:frame];
                [theLayer setBackgroundColor:bk];
                
                [rootLayer addSublayer:theLayer];
                
                [self setLayer:rootLayer];
                [self setWantsLayer:YES];
                
                CGColorRelease( bk );
    }
    return self;
}


n.b. 'theLayer' is an ivar.

Initially I didn't have a separate rootLayer, but looking at some  
sample code it seems most code uses one. Even though there's no layer  
content set I should see the border and the background colour  
shouldn't I? What am I missing?

BTW, another things that's a little unclear - when the rootLayer is  
added to the view, does it adopt the view's frame? Or should I be  
setting this explicitly? Sample code appears to just let it use its  
defaults.


thanks for any insight,


Graham
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