iOS入门速成：小巧精炼的开发者指南

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《iOS Succinctly》是一本由Ryan Hodson撰写，专为iOS开发者设计的小型电子书，旨在提供快速而全面的iOS开发入门指南。本书的特色在于其精炼的篇幅，让读者在短时间内掌握iOS开发的核心概念和技术。Daniel Jebaraj，Syncfusion公司的副总裁，为本书撰写了前言，强调了个人学习和教育用途的适用性。版权方面，该书受Syncfusion Inc.所有，要求读者在访问并完成注册后，通过官方网站www.syncfusion.com免费下载。未经授权从其他途径获取的书籍，用户需要注册并重新下载正版。这本书的使用仅限于个人或教育目的，禁止任何形式的再分发，确保读者理解并接受书中的条款。书中涵盖了iOS开发的基础知识，包括但不限于iOS平台的历史背景、Swift语言的简介、界面设计、应用程序架构、核心数据存储、网络编程以及与Apple生态系统的集成等内容。每个主题都力求简洁明了，帮助读者快速上手，同时强调作者和版权所有者不对提供的信息承担任何保证或责任，也不对由此产生的任何损失或索赔负责。 Daniel Jebaraj作为编辑，对全书进行了细致的校对和整理，确保内容的准确性和易读性。书后的目录提供了对章节内容的概览，便于读者根据自己的需求选择深入学习的具体部分。《iOS Succinctly》是一本适合iOS初学者和希望快速提升技能的开发者的实用资源，通过它，读者可以系统地了解iOS开发环境，掌握基本技术，并为后续的专业发展打下坚实基础。然而，必须明确的是，阅读这本书的条件是遵守所提供的使用条款。

int main(int argc, char *argv[]) {

@autoreleasepool {

return UIApplicationMain(argc,

argv,

nil,

NSStringFromClass([AppDelegate class]));

}

This launches your application by calling the UIApplicationMain() function, and passing

[AppDelegate class] as the last argument tells the application to transfer control over to our

custom AppDelegate class. We’ll discuss this more in the next section.

For most applications, you’ll never have to change the default main.m—any custom setup can

be deferred to the AppDelegate or ViewController classes.

AppDelegate.h and AppDelegate.m

The iOS architecture relies heavily on the delegate design pattern. This pattern lets an object

transfer control over some of its tasks to another object. For example, every iOS application is

internally represented as a UIApplication object, but developers rarely create a UIApplication

instance directly. Instead, the UIApplicationMain() function in main.m creates one for you

and points it to a delegate object, which then serves as the root of the application. In the case of

our HelloWorld project, an instance of the custom AppDelegate class acts as the delegate

object.

This creates a convenient separation of concerns: the UIApplication object deals with the

nitty-gritty details that happen behind the scenes, and it simply informs our custom

AppDelegate class when important things happen. This gives you as a developer the

opportunity to react to important events in the app’s life cycle without worrying about how those

events are detected or processed. The relationship between the built-in UIApplication

instance and our AppDelegate class can be visualized as follows:

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iOS入门速成：小巧精炼的开发者指南

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