1. 系统调用app的main函数
2. main函数调用UIApplicationMain.
3. UIApplicationMain创建sharedapplication instance, UIApplication默认的instance.
4. UIApplicationMain读取Info.plist找到主nib文件,
加载nib,把shared applicationinstance
设
为nib的owner.
5. 通过nib文件,创建app的独立UIWindows
object.
6. 通过nib,实例化了程序的AppDelegate
object.
7. app内部启动结束,application:didFinishLaunchingWithOptions:
被设定成 wAppDelegateinstance.
8. 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.
转播
