Objective-C – 从iOS 4到iOS 5的应用启动方法的差异？

我有一个标签栏应用程序,每个选项卡中都有一个导航控制器.

在iOS 4中,-application：didFinishLaunchingWithOptions：方法中的所有内容在启动后首先执行.执行该方法后,加载了第一个选项卡的视图控制器.

因此,当我记录我的启动应用程序进程(运行iOS 4.3的模拟器)时,它看起来像这样：

-[AcandoAppDelegate application:didFinishLaunchingWithOptions:] [Line 35] didFinishLaunchingWithOptions method running
-[AcandoAppDelegate application:didFinishLaunchingWithOptions:] [Line 60] This should be executed first // And it does as it should
-[AcandoAppDelegate applicationDidBecomeActive:] [Line 254] applicationDidBecomeActive method running
-[SeminarsViewController viewDidLoad] [Line 58] 2 - viewDidLoad method running
-[SeminarsViewController viewDidLoad] [Line 60] This should be executed second // Also as it should
-[SeminarsViewController viewWillAppear:] [Line 123] 3 - viewWillAppear method running
-[SeminarsViewController viewDidAppear:] [Line 173] viewDidAppear running

现在,当我记录我的启动应用程序进程(运行iOS 5.0的模拟器)时,它看起来像这样：

-[AcandoAppDelegate application:didFinishLaunchingWithOptions:] [Line 35] didFinishLaunchingWithOptions method running
-[SeminarsViewController viewDidLoad] [Line 58] 2 - viewDidLoad method running
-[SeminarsViewController viewDidLoad] [Line 60] This should be executed second // So this should be executed second but is executed first
-[SeminarsViewController viewWillAppear:] [Line 123] 3 - viewWillAppear method running
-[AcandoAppDelegate application:didFinishLaunchingWithOptions:] [Line 60] This should be executed first // And this is executed second but should be executed first
-[AcandoAppDelegate applicationDidBecomeActive:] [Line 254] applicationDidBecomeActive method running
-[SeminarsViewController viewDidAppear:] [Line 173] viewDidAppear running

我错过了一些明显的东西吗？对我来说,看起来我们在iOS 4和iOS 5之间有两种不同的启动情况？