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Framework
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AddressBook AddressBookUI AudioToolbox AudioUnit CFNetwork CoreAudio CoreFoundation CoreGraphics CoreLocation Foundation MediaPlayer OpenAL OpenGLES QuartzCore Security SystemConfiguration UIKit
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Purpose
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Accessing user s contacts Displaying Addressbook Audio data streams; playing and recording audio Audio units WiFi and cellular networking Core audio classes Similar to Foundation framework, but lower level (don t use unless you absolutely must) Quartz 2D User s location/GPS Cocoa foundation layer Video playback Positional audio library Embedded OpenGL (2-D and 3-D graphics rendering) Core animation Certificates, keys, and trust policies Network configuration iPhone user interface layer
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Table 1-1
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Frameworks on the iPhone
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It is this book s premise that once you understand how to create an iPhone application using the UIKit classes, you should learn the other frameworks
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iPhone Limitations
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If you have never programmed for a small device like an iPhone, there are some limitations you should be aware of before you begin programming Memory and processor speed are constrained, and the screen is small Security is also tight on an iPhone, and applications are limited in what they can do
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Memory and Processor Speed
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An iPhone s memory is constrained Chances are, you have a Mac with a dual-core and 2GB of memory Not so on the iPhone Although Apple hasn t divulged this information, according to hacker Craig Hockenberry of furborgorg, he has estimated that an iPhone has about a 600 MHz processing speed with 128MB of available physical memory The memory of the device is limited compared to your desktop
iPhone SDK Programming: A Beginner s Guide CAUTION
If your application uses too much memory, the iPhone OS X may abruptly terminate your application to prevent a system crash
Small Screen
An iPhone screen is 480 320 pixels There is not much room to work with Of course, controls such as buttons are smaller on an iPhone, but the layout space is still significantly constrained If you are accustomed to programming user interfaces on a 1280 800 pixel display, you must adjust your thinking Screen size is limited The small screen size also results in only one window being visible at a time In fact, every application you develop in this book consists of one window There will rarely be any reason to create another window when programming an iPhone application Instead, what you do is swap views into and out of an application s window But only one view is visible at a time no exceptions This restriction is sensible, as the screen is so small
Security
You can only read or write to directories that are part of your application s bundle Areas accessible to your application are said to be in your application s sandbox You cannot read files created by other applications You also cannot write to anywhere outside your application s sandbox Applications written by SDK users cannot share resources, period
Short-Lived Applications
Another iPhone application limitation is that it cannot be memory-resident A memory-resident application can run in the background while a user runs other applications Forget about memory-resident applications when programming for the iPhone You can t do it An iPhone can only have one program running at once This restriction puts your application in constant danger of the OS terminating it Think about it: Allegedly, an iPhone s primary purpose is still that of a cellular phone A phone call might arrive while your application is running In this situation, the OS asks a user if he or she wishes answering the call If the user chooses to answer the call, the iPhone OS terminates your application Because of this constant probability of sudden termination, you should program defensively and anticipate abrupt terminations You will see that the UIKit makes this easy by providing event handlers you can implement whenever your application is about to terminate
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