Question

I am attempting to draw an image onto a CALayer. I only need an image, so I have created my later as follows:

CALayer *layer = [CALayer layer];

I add my image as follows:

NSImage *img = [[NSImage alloc] initWithContentsOfFile:@"path/to/img.png"];
[layer setContents:img];

This works, however it draws my images to fill the entire parent frame (stretching my image in the process).

Reading the docs, I found the following:

[layer setContentsGravity:@"kCAGravityBottomLeft"];

I am attempting to draw my image in the bottom left of the parent frame, however no matter what I do it draws my icon in the bottom center. Is there anyway to specify the bottom left?

Answer 1

Try this:

CALayer *layer = [CALayer layer];
layer.contentsGravity = kCAGravityBottomLeft;
layer.contents = (id) aCGImageRef;

Note that kCAGravityBottomLeft is declared as NSString and the contents property expects a CGImageRef.