41⟩ Name the app sate which it reaches briefly on its way to being suspended?
An app enters background state briefly on its way to being suspended.
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52 IPhone Questions And Answers
42⟩ Assume that an app is not in foreground but is still executing code. In which state will it be in?
Background state.
43⟩ An app is loaded into memory but is not executing any code. In which state will it be in?
An app is said to be in suspended state when it is still in memory but is not executing any code.
44⟩ Assume that system is running low on memory. What can system do for suspended apps?
In case system is running low on memory, the system may purge suspended apps without notice.
45⟩ What is the use of controller object UIApplication?
Controller object UIApplication is used without subclassing to manage the application event loop. It coordinates other high-level app behaviors.
It works along with the app delegate object which contains app-level logic.
46⟩ How is the app delegate is declared by Xcode project templates?
App delegate is declared as a subclass of UIResponder by Xcode project templates.
47⟩ What happens if IApplication object does not handle an event?
In such case the event will be dispatched to your app delegate for processing.
48⟩ Which app specific objects store the apps content?
Data model objects are app specific objects and store app’s content. Apps can also use document objects to manage some or all of their data model objects.
49⟩ Are document objects required for an application? What does they offer?
Document objects are not required but are very useful in grouping data that belongs in a single file or file package.
50⟩ How to change the content of your app in order to change the views displayed in the corresponding window?
To change the content of your app, you use a view controller to change the views displayed in the corresponding window. Remember, window itself is never replaced.
51⟩ Which object is create by UIApplicationMain function at app launch time?
The app delegate object is created by UIApplicationMain function at app launch time. The app delegate object's main job is to handle state transitions within the app.
52⟩ Which object manage the presentation of apps content on the screen?
View controller objects takes care of the presentation of app's content on the screen. A view controller is used to manage a single view along with the collection of subviews. It makes its views visible by installing them in the app’s window.
