【IT168 技术】系统规格

　　iPhone的规格

　　Each is a 4.7- or 4.8-ounce computing device. Each contains a 620 MHz ARM CPU that has been underclocked to improve battery performance and reduce heat. The iPhone and iPhone 3G each include 128 MB of dynamic RAM (DRAM) and from 4 to 16 GB of Flash memory. The 3GS received an upgrade to 256 MB of RAM as well as a graphics chip enabling it to run OpenGL ES 2.0.

　　iPad的规格

　　The iPad weighs in at 1.5 pounds for the wi-fi model and 1.6 pounds for the wi-fi+3G model. Its 9.7-inch LED screen supports a resolution of 1024 x 768 at 132 pixels per inch. The iPad comes in 16 GB, 32 GB, and 64 GB models, all equipped with a 1 GHz A4 custom designed CPU.

▲

▲

▲

▲

　　知道了这些规格和操作，对软件的布局和操作设计很有用处

　　iOS的结构

▲

　　Most of your programming work will be done using the UIKit (UI) or Foundation (NS) frameworks. These libraries are collectively called Cocoa Touch; they’re built on Apple’s modern Cocoa framework, which is almost entirely object-oriented and, in our opinion, much easier to use than older libraries. The vast majority of code in this book will be built solely using Cocoa Touch.

　　Cocoa Touch It contains the UIKit framework—which is what we spend most of our time on in this book—and the address book UI framework. UIKit includes