iOS 开发指南：Apple 官方文档指南

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iOS 开发指南 iOS 开发技术是指使用 Apple 公司提供的开发工具和编程语言来开发 iOS 操作系统上的应用程序的技术。iOS 开发技术涉及到多个方面，包括开发工具、编程语言、软件框架、数据库等。根据提供的文件信息，我们可以提取出以下几个知识点： 1. 开发工具：IDEs（Integrated Development Environment），即集成开发环境，是开发 iOS 应用程序的必备工具。 Apple 公司提供了 Xcode 等开发工具，帮助开发者快速构建和调试 iOS 应用程序。 2. 编程语言：在 iOS 开发中，开发者可以使用 Objective-C、Swift 等编程语言来编写应用程序代码。Objective-C 是传统的 iOS 开发语言，而 Swift 是 Apple 公司最新推出的编程语言，具有更高的开发效率和可读性。 3. 软件框架：iOS 开发中，软件框架是指提供了一些预定义的类和方法，以便开发者快速构建应用程序。常见的软件框架包括 UIKit、Core Data 等。 4. 版权声明：在开发 iOS 应用程序时，开发者需要遵守 Apple 公司的版权声明，包括不允许复制、存储或传输 Apple 公司的软件和文档，除非获得 Apple 公司的书面许可。 5. 商标使用：在开发 iOS 应用程序时，开发者需要注意 Apple 公司的商标使用规定，包括不允许使用 Apple 公司的商标进行商业活动，除非获得 Apple 公司的书面许可。 6. 知识产权：Apple 公司保留所有与 iOS 开发技术相关的知识产权，包括专利、商标和著作权等。 7. 文档使用：在开发 iOS 应用程序时，开发者可以使用 Apple 公司提供的文档，但需要遵守 Apple 公司的版权声明，包括不允许复制、存储或传输 Apple 公司的文档，除非获得 Apple 公司的书面许可。 iOS 开发技术是指使用 Apple 公司提供的开发工具和编程语言来开发 iOS 操作系统上的应用程序的技术，涉及到多个方面，包括开发工具、编程语言、软件框架、数据库等。同时，开发者需要遵守 Apple 公司的版权声明和商标使用规定，并尊重 Apple 公司的知识产权。

The Quick Help window actively follows you as you move the cursor around a source file. When it recognizes

a symbol for which it finds API reference, the Quick Help window displays that reference, as shown in Figure

1-4. All you have to do is glance at the Quick Help window to get essential details about the symbol.

To display the Quick Help window, choose Help > Quick Help.

Figure 1-4 Viewing API reference in the Quick Help window

From the Quick Help window you can quickly jump to more comprehensive reference for the symbol, or

even view the header that declares it.

For more information about accessing documentation in Xcode, see Documentation Access.

Building and Running Your Application

iOS Simulator implements the iOS API, providing an environment that closely resembles the environment

devices provide. It allows you to run your applications in Mac OS X, letting you quickly test application

functionality when you don’t have a device available. However, running applications in iOS Simulator is not

the same as running them in actual devices. iOS Simulator does not emulate device performance: It doesn’t

implement the memory constraints or processor performance of an actual device. First, the simulator uses

Mac OS X versions of the low-level system frameworks instead of the versions that run on the devices.

Secondly, there may be hardware-based functionality that’s unavailable on the simulator. But, in general,

the simulator is a great tool to perform initial testing of your applications.

To get an accurate idea of how your application performs on a user’s device, you must run the application

on a device and gather performance data using Instruments and other performance-measuring tools.

To compile and debug your code, Xcode relies on open-source tools, such as GCC, LLVM-GCC, and GDB.

Xcode also supports team-based development with source control systems, such as Subversion, CVS, and

Perforce.

Building your application involves the following steps:

■ Compiling your source files and generating your application binary.

Essential Development Tasks

CHAPTER 1

iOS Development Quick Start

■ Placing the binary in iOS Simulator or on your device.

Xcode performs these tasks for you when you execute the Build command. See "Building and Running

Applications" (page 31) for details.

Measuring Application Performance

After you have tested your application’s functionality, you must ensure that it performs well on a device. This

means that the application uses the device’s resources as efficiently as possible. For example, memory is a

scarce resource; therefore, your application should maintain a small memory footprint so that it doesn’t

impair the performance of iOS. Your application should also use efficient algorithms to consume as little

power as possible not to reduce battery life. Xcode provides two major tools to measure and tune application

performance: Instruments and Shark.

The Instruments application is a dynamic performance analysis tool that lets you peer into your code as it’s

running and gather important metrics about what it is doing. You can view and analyze the data Instruments

collects in real time, or you can save that data and analyze it later. You can collect data about your application’s

use of the CPU, memory, the file system, and the network, among other resources.

The Shark application is another tool that helps you find performance bottlenecks in your code. It produces

profiles of hardware and software performance events, and shows how your code works as a whole and how

it interacts with iOS.

See "Tuning Applications" (page 71) for more information.

Further Exploration

To learn more about the Xcode development process, see A Tour of Xcode.

Tutorial: Hello, World!

This tutorial guides you through the creation of a simple iPhone application that prints text on the screen.

Create the Project

To create the Hello World project, follow these steps:

1. Launch the Xcode application, located in <Xcode>/Applications.

<Xcode> represents the directory in which you installed the Xcode toolset. See “Xcode Installation

Details” for more information.

2. Choose File > New Project.

Tutorial: Hello, World! 17

CHAPTER 1

iOS Development Quick Start

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