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Q:

What is the use of controller object UIApplication?

Answer

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.

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Subject: Application Development

Q:

Assume that your app is running in the foreground but is currently not receiving events. In which sate it would be in?

Answer

An app will be in InActive state if it is running in the foreground but is currently not receiving events. An app stays in InActive state only briefly as it transitions to a different state.

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Subject: Application Development

Q:

Why an app on iOS device behaves differently when running in foreground than in background?

Answer

An application behaves differently when running in foreground than in background because of the limitation of resources on iOS devices.

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Subject: Application Development

Q:

Which API is used to write test scripts that help in exercising the application's user interface elements?

Answer

 UI Automation API is used to automate test procedures. Tests scripts are written in JavaScript to the UI Automation API.  This in turn simulates user interaction with the application and returns log information to the host computer.

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Subject: Application Development

Q:

Where can you test Apple iPhone apps if you don’t have the device?

Answer

iOS Simulator can be used to test mobile applications. Xcode tool that comes along with iOS SDK includes Xcode IDE as well as the iOS Simulator. Xcode also includes all required tools and frameworks for building iOS apps.  However, it is strongly recommended to test the app on the real device before publishing it.

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Subject: Application Development

Q:

Explain the correct way to manage Outlets memory?

Answer

Create them as properties in the header that are retained. In the viewDidUnload set the outlets to nil(i.e self.outlet = nil). Finally in dealloc make sure to release the outlet.

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Subject: Application Development

Q:

If I call performSelector:withObject:afterDelay: – is the object retained?

Answer

Yes the object is retained. It creates a timer that calls a selector on the current threads run loop. It may not be 100% precise time-wise as it attempts to dequeue the message from the run loop and perform the selector.

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Subject: Application Development

Q:

Whats the difference between a NSArray and a NSMutableArray?

Answer

A NSArray’s contents can not be modified once it’s been created whereas a NSMutableArray can be modified as needed, i.e items can be added/removed from it.

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Subject: Application Development