Information Technology Reference
In-Depth Information
CAUTION
Sample projects almost always build successfully, but if you load a project for an older version of OS X or iOS,
some elements of the code may occasionally be deprecated or no longer available. If you find this, try to find a
more recent version. You can also work through the errors by hand. (This is likely to be educational, but time-con-
suming.)
Technical notes and Technical Q&As
Technical notes expand on topics that aren't typically based on specific frameworks or code features. Technical
Q&As deal with specific reported issues and common error messages; they also answer frequently asked ques-
tions. Both may include small samples of useful code and discuss solutions to common problems.
In practice, notes and Q&As are a grab bag of assorted unrelated programming and development topics. They
could be included elsewhere in the documentation, but for somewhat arbitrary reasons each has been given a
unique reference number. For example, Figure 6.12 shows Technical Q&A QA1620, which explains how to an-
imate a
CALayer
object.
The notes and Q&As are far from comprehensive. You'll find a wider selection of useful—even essen-
tial—examples, FAQs, and background information on independent developer message boards.
FIGURE 6.12
A technical Q&A document, from a collection of at least 1,620
