Re: Problem with CALayer delegate

FROM : Francois-Jean De Brienne
DATE : Sat Feb 23 06:38:33 2008

sure, but I don't really want to subclass calayer (unnecessary) and I 
have a feeling I would run into the same problem, no?

On 23-Feb-08, at 12:20 AM, Matt Long wrote:

> You could try creating your own CALayer derived class that overrides
>
> - (void)drawInContext:(CGContextRef)ctx
>
> drawLayer simply allows your delegate to override that same method 
> externally.
>
> -Matt
>
>
> On Feb 22, 2008, at 9:52 PM, Francois-Jean De Brienne wrote:
>

>> Hello everyone,
>>
>> I'm a very new cocoa developer (I switched two months ago) but an 
>> experienced (15+ years) developer.
>>
>> I'm struggling trying to get a CALayer delegate method, 
>> specifically drawLayer being called. I am trying to host the 
>> CALayer inside an NSView that would be the delegate for the CALayer.
>>
>> The CALayer is an attribute of my custom NSView called mainLayer.
>>
>> Here is the initWithFrame method for my custom NSView:
>>
>> -(id) initWithFrame: (NSRect) frameRect
>> {
>>     self = [super initWithFrame:frameRect];
>>     
>>     if (self)
>>     {
>>         mainLayer = [[[CALayer alloc] init] retain];
>>         
>>         [mainLayer setDelegate:self];
>>         [self setLayer:mainLayer];
>>         [self setWantsLayer:YES];
>>     }
>>     
>>     return self;
>> }
>>
>> Then, the custom NSView declares a drawLayer method as such (that 
>> I'd want to be called from my mainLayer):
>>
>> -(void)drawLayer:(CALayer*) layer inContext:(CGContextRef)ctx
>> {
>>     NSLog (@"Entered drawLayer");
>> }
>>
>> Now, whenever I send the setNeedsDisplay message to mainLayer, I 
>> assume that drawLayer would be called. It is not.
>>
>> drawLayer is also declared in the .h for the custom NSView (if that 
>> makes any difference).
>>
>> If I override and define drawRect for my NSView, I can verify that 
>> it does enter that method:
>>
>> - (void)drawRect:(NSRect)rect
>> {
>>     NSLog (@"Entered drawRect");
>> }
>>
>>
>> What am I doing wrong?
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>