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程序从 Main 入口启动， Main() 函数 -> UIApplicationMain() 函数(创建 UIApplication 对象，创建 UIApplication 的 delegate 对象，AppDelegate， 循环事件响应接收器)

Launching an app into the foreground

Figure 4-1 Launching an app into the foreground

Launching an app into the background

Figure 4-2 Launching an app into the background

Handling alert-based interruptions
Figure 4-3 Handling alert-based interruptions

Transitioning from the background to the foreground
Figure 4-4 Transitioning from the background to the foreground

Moving from the foreground to the background
Figure 4-5 Moving from the foreground to the background

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