More iPhone 3 Development

by David Mark and Jeff LaMarche

pg 369: When testing if a coordinate is within a map view’s displayed region, be sure to account for the international date line.
pg 370: The annotation view is the object that gets displayed on the map, not the floating window (or callout) that is displayed when it’s selected.
pg 373: Your map view’s delegate is notified with all annotations; test the annotation class and return nil for any classes you don’t recognize.
pg 376: If you need to track the user’s location, let the map view do it for you.
pg 378: You can redefine properties to be more permissive than declared in a protocol or in a superclass.
pg 379: A newline in a string will be stripped out when displayed in the annotation’s callout view.
pg 385: The location manager may give you stale data from the cache at first; you can ignore it and wait until fresh data arrives.

pg 458: Non-repeating timers are not typically used; instead, call the method performSelector:withObject:afterDelay.
pg 472: Accessors declared atomic autorelease returned values, so if another thread sets a new value through a mutator, the old value is not deallocated under a thread still working with it.
pg 473: Most of UIKit is not thread safe; don’t set or retrieve values or work with outlets from threads other than the main thread.
pg 475: When subclassing NSOperation, the main method must create its own autorelease pool, and wrap all logic in a @try block so no uncaught exceptions kill the application.
pg 478: Sending a cancel message to an operation only sets the property; it is up to the main method to check whether it has been cancelled and stop appropriately.
pg 489: Key value observation enables notification whenever objects are changed.

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