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Bad Cocoa
How to write the code of deep
regret quickly and easily
- @kattrali
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Think Monolithic
ensure changing one part of an
app requires changing them all
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Long Selector is Best Selector
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Test Private Stuff
ensure every test will break during
refactors
maximize the number of mocks,
stubs, and performSelector() calls
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Do Not Write Tests
no worries, the compiler will catch
your bugs
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Use Delegates with
Callbacks
If you don't need asynchronous
callbacks for synchronous code,
you aren't trying hard enough
-initWithDelegate:callback:
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Subclass Subclass
Subclass
things will be easy when you need
to swap out superclasses
sometime!
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Categoriception
Extend your own classes with
several categories instead of
containing each unit of related
functionality in a single class
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Maximize Responsibilities
Per Class
ensure the difficulty of changing
individual components later
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Safely assign many
responsibilities using
protocols
@class MyController : NSObject
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Safely assign many
responsibilities using
protocols
BONUS: Make each component of
a protocol optional, for maximum
flexibility and verbosity (and less
warnings!!)
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Procrastinate on
Performance
always wait until you have a
problem before opening
Instruments.app
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if (@"Avoid Static
Analysis")
goto fail;
goto fail;
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Always Swing the
Heaviest Hammer
NSOperation and Core Data all day
every day - maximize boilerplate
code
(GCD and NSCoding don't real)
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Make Code Styles
Inconsistent
increase the difficulty of using or
extending your project
avoid code style tools like clang-
format and Uncrustify
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Do not write
documentation
especially avoid easy-to-use
tooling like appledoc
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Optimize early
Reduce duplication as soon as
possible, making code less flexible
later
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When in doubt, add to
AppDelegate
There is no better place to dump
bits of code which do not belong
anywhere and need access to
application state
certainly not new classes
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#define over static
variables
get the most of your available
memory for your numbers, strings,
and colors
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Thank you!