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Before you rail against Apple on this limitation, consider the alternative Suppose you develop a long-running and battery-eating application that is memory-resident Your application s users notice a short battery life for their iPhone Who do they blame, you or Apple Apple
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The iPhone Software Development Kit (SDK)
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One of the big improvements in Objective-C 20 is garbage collection Garbage collection frees developers from having to worry about memory management, as the system does so automatically But the iPhone, with its limited resources, does not include Objective-C 20 garbage collection You must still manage memory yourself You can use something called autorelease, which makes memory management a little easier, but even autorelease is not recommended Instead, you should manage memory manually Although not a huge limitation, it is a pain, as forgetting to release an object is all too easy a mistake to make Of course, as you will see in 5, there are tools to help you track down and fix these errors
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Apple has considerable online documentation You have access to that documentation through both your Developer Connection membership and through Xcode s help You should refer to that documentation often Most documentation is also available as PDF documents The first two documents you should download and print are the iPhone Application Programming Guide and iPhone Development Guide You might then consider downloading and printing Cocoa Fundamentals Guide You will also find documents on Objective-C and various Cocoa classes If you followed this chapter s earlier recommendation and downloaded the documentation, you will find that all this information is at your fingertips using Xcode s help This book tries not to duplicate these online and desktop sources, but rather complement them by providing step-by-step examples illustrating how to do things Once you understand how, the online documentation shows you more options to expand upon this book s tutorial
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This chapter ends with a quick-start example to whet your appetite The next four chapters cover prerequisites that you should have prior to learning the iPhone s UIKit and Cocoa Touch But you are probably ready to start programming using these frameworks now, so this chapter ends with a simple iPhone application This quick start also familiarizes you with the IBOutlet and IBAction keywords and their use, and it familiarizes you with Xcode and Interface Builder
NOTE
Almost every Try This example in this book has an accompanying video available at my Web site (wwwjamesabrannancom) The first video this Try This application has accompanying audio explaining the steps taken The remaining videos have no sound; however, they follow their corresponding Try This application s numbered steps exactly, so you can follow the video by referring to the book
(continued)
iPhone SDK Programming: A Beginner s Guide
Figure 1-5
New Project dialog
1 Open Xcode From the menu select File | New Project and the New Project dialog appears
(Figure 1-5)
2 Select View-based Application and click Choose In the Save As dialog, give the
application the name QuickStart (Figure 1-6)
1:
The iPhone Software Development Kit (SDK)
Figure 1-6
Save As dialog
3 Xcode should create the project In the Groups & Files pane, expand the Classes and
Resources folders (Figure 1-7)
4 Double-click QuickStartViewControllerxib to open it in Interface Builder
(continued)
iPhone SDK Programming: A Beginner s Guide
Figure 1-7
Xcode with Classes and Resources folders expanded
5 If a canvas like the one shown in Figure 1-8 is not visible, double-click View in the
document window (Figure 1-9)
6 Ensure the library is visible by selecting Tools | Library from Interface Builder s main
menu Ensure the library shows all Cocoa Touch classes by going to the library s top pane, expanding Library, and clicking Cocoa Touch (Figure 1-10)
1:
The iPhone Software Development Kit (SDK)
Figure 1-8
A view s canvas in Interface Builder
Figure 1-9
The document window
(continued)
iPhone SDK Programming: A Beginner s Guide
Figure 1-10 The library
1:
The iPhone Software Development Kit (SDK)
Figure 1-11 Adding a button
7 Scroll through the controls until you find a Round Rect Button Drag-and-drop the button
to the canvas (Figure 1-11)
8 Double-click the button on the canvas, and give the button a title 9 Drag a label from the library to the canvas (Figure 1-12)
(continued)
iPhone SDK Programming: A Beginner s Guide
Figure 1-12 Adding a label
10 Save and exit Interface Builder 11 Select QuickStartViewControllerm in the Classes folder in Groups & Files Xcode should
display the file in the editor pane (Figure 1-13)
12 Change QuickStartViewControllerm so it matches Listing 1-1 13 Open QuickStartViewControllerh and modify the file so it matches Listing 1-2 14 Select Build | Build from Xcode s main menu to build the application 15 Open QuickStartViewControllerxib in Interface Builder
1:
The iPhone Software Development Kit (SDK)
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