On Oct 22, 2008, at 12:09 AM, Patrick Mau wrote:
On 22.10.2008, at 02:54, DKJ wrote:
Me again. I've been using this code:
NSURL *url = [NSURL fileURLWithPath:fname];
CGImageSourceRef source =
CGImageSourceCreateWithURL((CFURLRef)url, NULL);
CGImageRef image = CGImageSourceCreateImageAtIndex(source, 0, NULL);
CFRelease(source);
theView.layer.contents = (id)image;
It compiles without complaint, but I'm still not seeing the image.
I can see the effects of changing other properties of the layer
(e.g. borderWidth). I've checked that image is not NULL. What am I
missing here?
You are probably missing a '[theView.layer setNeedsDisplay];'
By default this will obliterate the contents that you have just set.
Calling -setNeedsDisplay or -display will cause the layer to generate
content and set the contents property to the result of that operation.
If you set the contents property manually, you should never call -
setNeedsDisplay or -display on that layer or the content you set will
be lost. You can avoid this by implementing some delegate methods or
subclassing a CALayer, but it is generally easier to avoid the issue
entirely by maintaining control over the CALayer when doing this.
--
David Duncan
Apple DTS Animation and Printing
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