iOS 5 App Development Objective C

Instructions:

• Answer 50 questions in 15 minutes.
• If you are not ready to take this test, you can study here.
• Match each statement with the correct term.
• Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. In object oriented languages - we call methods that get and set instance variables accessors - individually we call them...

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2. Execution of the break statement...
causes the program to immediately exit from the loop it is executing - whether its for - while or do
CGFloat
in the dealloc - or when a Controller's view is 'unloaded'
methods


3. Values to be supplied as the parameters to the method
position
size and position
arguments[message]
only the class and subclasses can access


4. A collection object - an ordered list of objects that can be accesed by an index
array[class - NSMutableArray]
to get and set variables
receiver[message]
you must import the header file of that class


5. In object oriented languages - we call methods that get and set instance variables

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6. In Objective C arrays can hold only...
creates an instance of NSString that holds the character string
references to objects
count - objectAtIndex - makeObjectsPerformSelector - sortedArrayUsingSelector - lastObject
callbacks


7. An instance is a device for maintaining state. It's a box for _ of data.
CGRect
designated initializer
accessors - individually we call them 'getters' and 'setters'
storage


8. Center and frame are used to _ your view
position
instance variables
pointers
has one root view controller


9. In the last line of an init method...
do so in viewDidLoad
Generic object wrapper for other non-object data types
you always return the newly initialized object(return self)
will be ignored


10. Each _ has a 'designated' initializer method....
is an instance of that class
you must import the header file of that class
references to objects
class


11. If you have extra work you want to do on the view...
Core Graphics Framework
its dataSource
do so in viewDidLoad
alloc - singleton - informational utility method?


12. A function in the objective c library that simply displays or logs it's argument
instance variable of an object is valid
unordered collection of objects - objects must be unique
instance variables
NSLog routine


13. What happens when the last owner calls release?

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14. Dynamic binding means that when we call a certain object's method - and there are several _ of that method - the right one is figured out at runtime.
@synthesize
designated initializer
implementation
self


15. Primitives and C Structures...
ordered collection of objects - immutable
@synthesize
cannot be added to an array
subview(s)


16. Core foundation classes are prefixed with _ and suffixed with _
CF - Ref
CGRect bounds - GCPoint center - CGRect frame
cannot be added to an array
You take ownership for an object you want to keep a pointer to


17. Designated initializer makes sure that every...
message
calling code that does the instantiation for you
in the dealloc - or when a Controller's view is 'unloaded'
instance variable of an object is valid


18. Only exists within the statement block there defined - outside of the block is fine
variable scope - if defined within a block
header files declare
instance variables
delegates and dataSources


19. Instance Variables by default are called @protected meaning...
the message release to all its entries
%d
only the class and subclasses can access
receiver[message]


20. Property List...
instance variables
collection of collections - NSArray of an NSArray
is an instance of that class
class methods - initializers


21. Views have three properties related to their location and size: @property _ _;
has one root view controller
method
for inheritance - adopting the superclasses implementation
CGRect bounds - GCPoint center - CGRect frame


22. Order of the declarations for methods. _ come first - followed by _ - followed by any other methods...
(id)initWithFrame:(CGRect)aRect;
instance variables
values
class methods - initializers


23. When an object is removed from an NSMutableArray - that object is sent the message release;...
define it in the implemenation file
reuse your cells
Controller Objects[Managers]
the array relinquishes ownership of that object and no longer has a pointer to it


24. Files Owner...
Is a placeholder object
an object's property
CGFloat
NSBundle


25. class methods...
the array relinquishes ownership of that object and no longer has a pointer to it
Abstraction
alloc - singleton - informational utility method?
group of global functions already assigned to this class


26. Hold data and know nothing about the user interface
Core Graphics Framework
UIView
Model Objects[Factory Worker]
the array becomes an owner of that object and has a pointer to it.


27. The root view controller typically creates the next view controller - and the next _ creates the one after that
safety - subclassability and makes code look more consistent with C structs
view controller
UIView
class


28. If a break statement is executed from within a set of nested loops...
only the innermost loop in which the break is executed is terminated
array[class - NSMutableArray]
cannot be added to an array
Encapsulation of functionality


29. NSString objects are usually sent _ rather than _...
viewWillDissapear: and viewWillAppear:
copy - retain
new instances of the class or retrieve some global property of the class.
calling code that does the instantiation for you


30. Prefixing a character string with an @ symbol [specific - NSString class]...
NSLog routine
UIViewController
creates an instance of NSString that holds the character string
@interface ClassName:SuperClassName


31. In general - in Objective-C - a reference to an instance is a _ - and the name of the data type of what's at the far end of that pointer is the name of the instances's _.
pointer - class
data
variable scope - if defined within a block
first responder


32. A view represents a _ area
dealloc - is called on the object & the object's memory is returned to the heap
C Functionn
cannot be added to an array
rectangular


33. A message is always contained in square brackets - and has three parts
CGFloat
Model Objects[Factory Worker]
receiver - selector - arguments
view controller


34. super - is used...
initializers
causes the program to immediately exit from the loop it is executing - whether its for - while or do
self
for inheritance - adopting the superclasses implementation


35. Use of class methods - there are three...
class's
setPossessionName
alloc - singleton - informational utility method?
accessors - individually we call them 'getters' and 'setters'


36. Objective C only allows for single inheritance - so in regards to class you only ever see the following pattern
view
@interface ClassName:SuperClassName
Model Objects[Factory Worker]
Generic object wrapper for other non-object data types


37. Never access a view controller's view in that...

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38. NSString *s = @'Hello - World'; is an example of...
size and position
data source - view controller and delegate
declaration and initialization of a variable
receiver


39. How do I implement my drawRect?
ordered collection of objects - immutable
Core Graphics Framework
nil
storage


40. NSArray - important methods...
will be ignored
count - objectAtIndex - makeObjectsPerformSelector - sortedArrayUsingSelector - lastObject
wait until the loop finishes processing the event - at the end release it
class methods - initializers


41. id is a...
receiving and handling events that are associated with it
'getters' and 'setters'
pointer to an object
nil


42. NSNumber - class...
do so in viewDidLoad
cannot be added to an array
@synthesize
Object wrapper around primitive types like int - float - double - BOOl


43. 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....
CGRect
define it in the implemenation file
the array becomes an owner of that object and has a pointer to it.
the message release to all its entries


44. When do we need to release our outlets?

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45. Ready-made instances...
alloc - singleton - informational utility method?
safety - subclassability and makes code look more consistent with C structs
calling code that does the instantiation for you
message


46. Class methods typically either create
the array relinquishes ownership of that object and no longer has a pointer to it
'getters' and 'setters'
new instances of the class or retrieve some global property of the class.
storage


47. The class is responsible for what instance variables the instance has - but not the _ of those variables.
'getters' and 'setters'
Encapsulation of functionality
implementation
values


48. When an object is added to a NSMutableArray - that object is sent the message to retain;...
draw images
the array becomes an owner of that object and has a pointer to it.
(id)initWithFrame:(CGRect)aRect;
self


49. What does autorelease mean?
Object wrapper around primitive types like int - float - double - BOOl
CGRect
declaration and initialization of a variable
wait until the loop finishes processing the event - at the end release it


50. All objects are accessed using...
selector[message]
is an instance of that class
collection of collections - NSArray of an NSArray
pointers