Re: Problem with CALayer delegate

FROM : Francois-Jean De Brienne
DATE : Sat Feb 23 06:48:58 2008

thanks, but this did not help. I'm still not getting drawLayer: 
inContext to be called.



On 23-Feb-08, at 12:41 AM, Vinay Prabhu wrote:

> Instead of creating CALayer object using,
> mainLayer = [[[CALayer alloc] init] retain];
>
> try creating the CALayer this way,
> mainLayer = [[CALayer layer] retain];
>
> -Vinay
>
> On Feb 23, 2008, at 10:50 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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>>
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>