I'm not saying one has to read the manual before playing around, but some things are simply not explorable with at least a little bit of introduction. You had to read somewhere that [NSObject alloc]init] was how to create a new object; you didn't just guess at it. Similarly, how far would someone get creating a CALayer, and adding it to a view without ever looking at the docs?

If someone is having a hard time learning Objective-C, maybe the real suggestion is to start by reading at least a bit of the manual.