【iOS开发】iOS程序的运行流程

    xiaoxiao2025-02-16  11

    系统调用app的main函数

    main函数调用UIApplicationMain.

    UIApplicationMain创建sharedapplication instance, UIApplication默认的instance.

    UIApplicationMain读取Info.plist找到主nib文件, 加载nib,把shared applicationinstance 设为nib的owner.

    通过nib文件,创建app的独立UIWindows object.

    通过nib,实例化了程序的AppDelegate object.

    app内部启动结束,application:didFinishLaunchingWith-Options: 被设定成 wAppDelegate instance.

    AppDelegate向UIWindowinstance发makeKeyAndVisible消息, app界面展示给用户. app准备好接收用户的操作指令.

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