Re: Problem with CALayer delegate
Re: Problem with CALayer delegate
- Subject: Re: Problem with CALayer delegate
- From: Vinay Prabhu <email@hidden>
- Date: Sat, 23 Feb 2008 12:03:10 +0530
your code looks fine to me, ideally the delegates should get called.
In my code, I have called the API's,
self setLayer:mainLayer];
[self setWantsLayer:YES];
after the view is initialized, like,
Code in the Controller class:
CustomView* view = [[CustomView alloc] initWithFrame:rect];
[view setUpCALayers];
Code in the view class:
- (void) setUpCALayers
{
self setLayer:mainLayer];
[self setWantsLayer:YES];
}
- (void)updateLayers
{
[mainLayer setNeedsDisplay];
}
and it is perfectly working fine.
I am not able to explain why delegates are not getting called in your
code,
but you can try moving the setLayer and setWantsLayer outside the init.
-Vinay
On Feb 23, 2008, at 11:18 AM, Francois-Jean De Brienne wrote:
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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