Tagging CALayers in iPhone

You can also use the name property of the CALayer.

[layer setName:@"myKey"];

To look it up,

- (CALayer *)myLayer {

    for (CALayer *layer in [superLayerOfMyLayer sublayers]) {

            if ([[layer name] isEqualToString:LabelLayerName]) {
                return layer;
            }
    }

    return nil;
}