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Basic iOS 5 App Development Objective C MCQ

1. A view is an...

Retain

Instance of UIView or one of its subclasses

Generic object wrapper for other non-object data types

Selector[message]

Answer

Correct Answer: Instance of UIView or one of its subclasses

Note: This Question is unanswered, help us to find answer for this one

2. The notion that the data for an object is stored in it's instance variables and is accessed only by the objects methods. This maintains the integrity of the data.

Hash table - Look up objects using a key to get a value.

Wait until the loop finishes processing the event - at the end release it

'getters' and 'setters'

Data Encapsulation

Answer

Correct Answer: Data Encapsulation

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3. Id is a...

Cannot be added to an array

Encapsulation of functionality

Pointer to an object

Instance variables

Answer

Correct Answer: Pointer to an object

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4. When you send a message to _ - you are sending a message to _ - but demanding that the search for the method begin at the superclass....

Super - self

Nil

Initializer

Instance variables

Answer

Correct Answer: Super - self

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5. Any other initializer a class has calls the _ designated initializer....

28. Also if you send the NSObject the _ message - you own that object.

Group of global functions already assigned to this class

Variable scope - if defined within a block

Anytime you call a method with new - alloc or copy. You own and must release that object.

Retain

Answer

Correct Answer: Retain

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6. NSSet...

Object

Data source - delegate and view controller

View

Unordered collection of objects - objects must be unique

Answer

Correct Answer: Unordered collection of objects - objects must be unique

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7. UIViewController has several methods that get called at certain times...

Object

Instance variables

ViewWillAppear - viewDidAppear - viewWillDisappear & viewDidDisappear

Upper

Answer

Correct Answer: ViewWillAppear - viewDidAppear - viewWillDisappear & viewDidDisappear

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8. A set of variables and associated methods. An object can be sent messages to cause one of its methods to be executed.

Instance variables

Lowercase - uppercase

Object

Used to find the time right now or to store past or future time/dates

Answer

Correct Answer: Object

Note: This Question is unanswered, help us to find answer for this one

9. How do I implement my drawRect?

Core Graphics Framework

Header files declare

Variable scope - if defined within a block

NSCoder

Answer

Correct Answer: Core Graphics Framework

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10. A command directed to an object is called an...

Designated initializer

Message

Core Graphics Framework

The message release to all its entries

Answer

Correct Answer: Message

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11. A view represents a _ area

Used to find the time right now or to store past or future time/dates

A mechanism to enable specific callbacks

Calling code that does the instantiation for you

Rectangular

Answer

Correct Answer: Rectangular

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12. Also - because arrays only hold a pointer to an object...

Array[class - NSMutableArray]

A mechanism to enable specific callbacks

Initializers

A single-array can contain objects of different types

Answer

Correct Answer: A single-array can contain objects of different types

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13. NSString* s2 = [s uppercase String]; Is an example of what kind of instance?

Ready-Made Instance

Initializer

Class

A single-array can contain objects of different types

Answer

Correct Answer: Ready-Made Instance

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14. Class methods do not operate on an _ or have any access to _ variables....

Instance

Implementation

You always return the newly initialized object(return self)

They need to be defined in the implementation file

Answer

Correct Answer: Instance

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15. When the message endEditing: is sent to a view - if it or any of its subviews or currently the _ - it will resign its first responder statues - and the keyboard will be dismissed.

Its dataSource

First responder

Only the innermost loop in which the break is executed is terminated

CGRect

Answer

Correct Answer: First responder

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16. A UITableView usually needs three different pieces...

NSLog routine

Safety - subclassability and makes code look more consistent with C structs

Data source - view controller and delegate

Data source - delegate and view controller

Answer

Correct Answer: Data source - delegate and view controller

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17. Super - is used...

UIView

NSCoder

Rectangular

For inheritance - adopting the superclasses implementation

Answer

Correct Answer: For inheritance - adopting the superclasses implementation

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18. Files Owner...

Data source - view controller and delegate

Instantiation from scratch

ViewWillAppear - viewDidAppear - viewWillDisappear & viewDidDisappear

Is a placeholder object

Answer

Correct Answer: Is a placeholder object

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19. If the view has no subviews - create it programmatically; if it has subviews

The instance variables

Message

Create a XIB file

They need to be defined in the implementation file

Answer

Correct Answer: Create a XIB file

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20. In Cocoa Touch - the table view asks another object _ what it should display...

Retain

Its dataSource

Implementation

Abstraction

Answer

Correct Answer: Its dataSource

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21. An instance is a device for maintaining state. It's a box for _ of data.

@synthesize

Create a XIB file

Storage

Is a placeholder object

Answer

Correct Answer: Storage

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22. If you have extra work you want to do on the view...

Anytime you call a method with new - alloc or copy. You own and must release that object.

Variable scope - if defined within a block

Maintenance of state

Do so in viewDidLoad

Answer

Correct Answer: Do so in viewDidLoad

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23. Reducing details to focus on the core concepts

Abstraction

@interface ClassName:SuperClassName

Continue

Variable scope - if defined within a block

Answer

Correct Answer: Abstraction

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24. To load a Xib file manually - you use _

Initializers

Anytime you call a method with new - alloc or copy. You own and must release that object.

NSBundle

A mechanism to enable specific callbacks

Answer

Correct Answer: NSBundle

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25. When overriding a method - all you need to is _ - you do not need to declare it in the header file because it has already been declared by the superclass....

View controller's initialization method

Define it in the implemenation file

Hash table - Look up objects using a key to get a value.

Pointer to an object

Answer

Correct Answer: Define it in the implemenation file

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26. A responder is responsible for...

Wait until the loop finishes processing the event - at the end release it

Designated initializer

Receiving and handling events that are associated with it

Class

Answer

Correct Answer: Receiving and handling events that are associated with it

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27. If you implemented both the setter and getter - the @synthesize method...

Ready-made instances - instantiation from scratch - and nib based instantiation

CF - Ref

Subview(s)

Will be ignored

Answer

Correct Answer: Will be ignored

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28. Origin of a views coordinate system is _ left

Count - objectAtIndex - makeObjectsPerformSelector - sortedArrayUsingSelector - lastObject

Delegates and dataSources

Instance variables

Upper

Answer

Correct Answer: Upper

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29. SomeClass* aVariable = [[SomeClass alloc] init]; is an example of what kind of instance?

Instantiation from scratch

To give it someone else - or another object

The array becomes an owner of that object and has a pointer to it.

C Functionn

Answer

Correct Answer: Instantiation from scratch

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30. [Instance Variables] The code it gets from its class and in a sense is shared with all other instances of that class - but the _ belong to it alone.

UIViewController

Instance of UIView or one of its subclasses

Arguments[message]

Data

Answer

Correct Answer: Data

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