Errata for Core Animation for Mac OS X and the iPhone

#35409: In my reading of your book so far, you have changed tenses from 'we' to 'I' and 'you' several times.

This makes the book hard to read. Who is the 'we'? The author and the reader? But only I am reading the book, not the author.

There are many works of a technical nature that do not have to resort to 'we' and 'you' in order to impart information.

Also, at the top of page 15, you introduce a certain 'Daniel'. Daniel who?

Regards,

Karl

--Karl Goiser

#35393: Top of the page. You need to find 14 positions between the starting and ending positions for the animation. The starting position is 0 and not counted as one of the animation positions. There are 15 time periods so each needs a new position at its end (the final one and the 14 intermediate positions).--David Reidy

#35469: > In this first bit of code, we are initializing the mover view (the NSImageView
> that holds our picture) to the center of the screen, and then on line 17 we add > the animation to the view.

Actually, mover view is located not in center of the screen but 3/8 of it (according to sample code)--Roman Busyghin

#35472: > Now, there is a bit of a trick here. As mentioned earlier, layer backing
> has to be tur ned on for the transitions to work properly. That has been
> done for you in the NIB file, though, so you don’t have to mess with it.
> To see where this is switched on, choose the TransitionView in Inter face
> Builder and hit Command+2 to see the animation inspector.

I don't see any layer backing properties in animation inspector. Could you provide a screenshot?--Roman Busyghin

#35898: On page 57, "Chaining Animations,"
I find:
"There’s more flexibility in chaining animations when we’re using strictly
layers in a layer-hosting view."

The phrase "when we’re using strictly layers" seems awkward.

Try something like this:
"The layers of a layer-hosting view allow us to chain animations more flexibly."

Also, the line above seems awkward, too.
" You can, however, attach a delegate to the group and get notification of the group completing. "
Try:
" You can, however, attach a delegate to the group. The delegate will receive a notification when the group completes."

--Don Briggs

#35361: "We can do a lot more with CATextLayer than this simple example
shows. Instead of using a straight NSString and therefore having
a single font and color, we could instead use an NSAttributed-
String, and then we could use much of the expressive power of
the attributed string. As we said in the main text, the CATextLayer
is not a full-fledged layout engine, but it is capable of doing
a lot more than simply displaying a string in a single font and
color." -- this redundant section looks like an overlooked artifact of the editing process.--Mietek Bąk