Titlebook: Learn Objective-C on the Mac; For OS X and iOS Scott Knaster,Waqar Malik,Mark Dalrymple Book 2012Latest edition Scott Knaster and Mark Dalr

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Inheritance,When you write an object-oriented program—and we hope you’re going to write . of them—the classes and objects you create have relationships with each other. They work together to make your program do its thing.

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Introduction to UIKit,So far, we have had a lot of fun learning about writing apps for OS X, the Mac operating system. But enough of that Mac stuff for a while. It’s time to switch gears and take a look at how to write an app for iOS. Just as Mac apps use AppKit, iOS apps use UIKit. It has all the UI components and goodness that make iOS apps what they are.

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File Loading and Saving,Many computer programs (applications) end up creating some kind of semi-permanent artifact of the user’s work. Maybe it’s an edited photo. Maybe it’s a chapter of a novel. Maybe it’s your band’s cover of “Free Bird.” In each of these cases, the user ends up with a saved file.

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Composition,code. And we (briefly) mentioned that you can also set up relationships using composition, which is the subject of this chapter. You can use composition to combine objects so they can work together. In a typical program, you’ll use both inheritance and composition when creating your own classes, so

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More About Xcode,ich are obvious. When you’re going to be living inside a powerful tool for a long time, you’ll want to learn as much about it as you can. In this chapter, we’ll introduce you to some Xcode tips and tricks that are useful when you’re writing and navigating your code and locating information you need.

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A Quick Tour of the Foundation Kit,re going to take a quick side trip and have a look at Cocoa’s Foundation framework. Although strictly part of Cocoa and not built in to Objective-C, the Foundation framework is so important that we thought it worth exploring in this book.