By Matt Galloway
Powerful Objective-C 2.0 can help you harness all of Objective-C’s expressive energy to jot down OS X or iOS code that works beautifully good in creation environments. utilizing the concise, scenario-driven kind pioneered in Scott Meyers’ best-selling powerful C++, Matt Galloway brings jointly fifty two Objective-C most sensible practices, suggestions, shortcuts, and lifelike code examples which are to be had nowhere else.
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Additional resources for Effective Objective-C 2.0 52 Specific Ways to Improve Your iOS and OS X Programs
A class can understand only messages that it has been programmed to understand, through implementing methods. But it’s not a compile-time error to send a message to a class that it doesn’t understand, since methods can be added to classes at runtime so the compiler has no way of knowing whether a method implementation is going to exist. When it receives a method that it doesn’t understand, an object goes through message forwarding, a process designed to allow you as the developer to tell the message how to handle the unknown message.
Therefore, you will usually want to use nonatomic properties on iOS. But on Mac OS X, you don’t usually find that atomic property access is a performance bottleneck. Things to Remember The @property syntax provides a way of defining what data an object encapsulates. Use attributes to provide the right semantics for the data being stored. Ensure that anywhere a property’s backing instance variable is set, the declared semantics are adhered to. Use nonatomic on iOS, since performance is severely impacted if atomic is used.
I alluded earlier to the fact that objc_msgSend and friends “jump to” the correct method implementation once it has been looked up. ) The name of the function is not quite like this, but I’ve shown it as a combination of the class and the selector just to illustrate the point. Pointers to functions like this are held in a table within each class, keyed against the selector name. It’s this that the objc_msgSend family of methods looks through to find the implementation to jump to. Note that the prototype is strangely similar to the objc_msgSend function itself.