CALayer (Xcode): hitTest, sublayers, CABasicAnimation, shadows, borders and corners

Part 1 (access and manipulation)
http://sketchytech.blogspot.co.uk/2012/10/the-secret-life-of-calayer-part-1.html

Part 2 (sublayers and hitTest)
http://sketchytech.blogspot.co.uk/2012/10/the-secret-life-of-calayer-part-2.html

Part 3 (CABasicAnimation)
http://sketchytech.blogspot.co.uk/2012/10/the-secret-life-of-calayer-part-3.html

Part 4 (shadows, borders and corners)
http://sketchytech.blogspot.co.uk/2012/10/the-secret-life-of-calayer-part-4.html