Test your basic knowledge |

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. Name of the method to be executed
unordered collection of objects - objects must be unique
receiver[message]
selector[message]
calling code that does the instantiation for you

2. [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.
accessors - individually we call them 'getters' and 'setters'
type - name and value
define it in the implemenation file
data

3. Archiving works by creating an instance of _ - which is essentially just a container for data - and placing objects and their data inside it.
NSCoder
Encapsulation of functionality
setPossessionName
a mechanism to enable specific callbacks

4. A pointer to the object being asked to execute a method
draw images
receiver[message]
UIViewController
NSBundle

5. A block of statements identified by a name that can accept one or more arguments passed to it by value and can optionally return a value
view
Functions
is an instance of that class
to give it someone else - or another object

6. All objects are accessed using...
first responder
create a XIB file
header files declare
pointers

7. @property - is using methods...
to get and set variables
reuse your cells
a single-array can contain objects of different types
NSLog routine

8. Any individual object belonging to any class...
causes the program to immediately exit from the loop it is executing - whether its for - while or do
is an instance of that class
Object wrapper around primitive types like int - float - double - BOOl
methods for generating an instance

9. A UITableViewController can fill all three roles of...
data source - view controller and delegate
variable scope - if defined within a block
for inheritance - adopting the superclasses implementation
reuse your cells

10. If you aren't going to initialize an instance reference pointer at the moment you declare it by assigning a real value - it's a good idea to assign it _.
methods for generating an instance
nil
do so in viewDidLoad
initializers

11. Class methods typically either create
arguments[message]
data
new instances of the class or retrieve some global property of the class.
copy - retain

12. NSArray - class...
its dataSource
ordered collection of objects - immutable
message
%d

13. SomeClass* aVariable = [[SomeClass alloc] init]; is an example of what kind of instance?
Instantiation from scratch
will be ignored
viewWillAppear - viewDidAppear - viewWillDisappear & viewDidDisappear
initializers

14. Execution of the break statement...
unordered collection of objects - objects must be unique
arguments[message]
causes the program to immediately exit from the loop it is executing - whether its for - while or do
values

15. Reducing details to focus on the core concepts
view controller
its dataSource
Abstraction
data

16. Each individual instance is a bundle of data that it maintains. Typically that data is private - which means that it's encapsulated as well; no other object knows what that data is or in what form it is kept. The only way to discover from outside wha
ready-made instances - instantiation from scratch - and nib based instantiation
array[class - NSMutableArray]
Maintenance of state
instance variables

17. UIViewController has several methods that get called at certain times...
header files declare
Model Objects[Factory Worker]
viewWillAppear - viewDidAppear - viewWillDisappear & viewDidDisappear
you must import the header file of that class

18. Property List...
CGRect bounds - GCPoint center - CGRect frame
collection of collections - NSArray of an NSArray
Encapsulation of functionality
instance of UIView or one of its subclasses

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

Warning: Invalid argument supplied for foreach() in /var/www/html/basicversity.com/show_quiz.php on line 183

20. super - is used...
the instance variables
an object's property
subview(s)
for inheritance - adopting the superclasses implementation

21. NSNumber - class...
copy - retain
Continue
Object wrapper around primitive types like int - float - double - BOOl
they need to be defined in the implementation file

22. NSString* s2 = [s uppercase String]; Is an example of what kind of instance?
implementation
'getters' and 'setters'
instance variable of an object is valid
Ready-Made Instance

23. To get the full path for a directory in the sandbox - you use the _ NSSearchPathForDirectoriesInDomains.
rectangular
C Functionn
to give it someone else - or another object
draw images

24. The integer prefix is...
%d
the array becomes an owner of that object and has a pointer to it.
Maintenance of state
group of global functions already assigned to this class

25. Classes describe two things...
in the dealloc - or when a Controller's view is 'unloaded'
header files declare
attributes - behavior
Is a placeholder object

26. A collection object - an ordered list of objects that can be accesed by an index
safety - subclassability and makes code look more consistent with C structs
array[class - NSMutableArray]
CF - Ref
will be ignored

27. UIView - designated initializer...
designated initializer
creates an instance of NSString that holds the character string
(id)initWithFrame:(CGRect)aRect;
Is a placeholder object

28. Inside a method - _ is an implicit local variable. Typically - _ is used so that an object can send a message to itself....
values
create a XIB file
nil
self

29. NSValue - class...
they need to be defined in the implementation file
Abstraction
Generic object wrapper for other non-object data types
dealloc - is called on the object & the object's memory is returned to the heap

30. Categories are an Objective C way to add _ to an existing class without subclassing
methods
message
self
object

31. Core foundation classes are prefixed with _ and suffixed with _
message
CF - Ref
callbacks
data

32. Prefixing a character string with an @ symbol [specific - NSString class]...
creates an instance of NSString that holds the character string
Data Encapsulation
setPossessionName
attributes - behavior

33. Ready-made instances...
NSCoder
causes the program to immediately exit from the loop it is executing - whether its for - while or do
ready-made instances - instantiation from scratch - and nib based instantiation
calling code that does the instantiation for you

34. The only reason to temporarily own an object - is...
attributes - behavior
a mechanism to enable specific callbacks
the instance variables
to give it someone else - or another object

35. 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....
nil
ordered collection of objects - immutable
NSLog routine
define it in the implemenation file

36. @property declares - and _ implements the setter and getter...
receiver
message
@synthesize
ordered collection of objects - immutable

37. To load a Xib file manually - you use _
initializers
arguments[message]
NSBundle
CGRect bounds

38. A command directed to an object is called an...
parentViewController
message
safety - subclassability and makes code look more consistent with C structs
they need to be defined in the implementation file

39. A class inherits all _ from its superclass and can add as many as it wants for its own purposes....
the message release to all its entries
to give it someone else - or another object
ready-made instances - instantiation from scratch - and nib based instantiation
initializers

40. When a view controller presents a modal view controller - the _ of the modal view controller is set to be the parent of the presenting controller
data source - view controller and delegate
pointers
parentViewController
Model Objects[Factory Worker]

41. UITableViewController is a subclass of...
Generic object wrapper for other non-object data types
UIViewController
attributes - behavior
CGRect bounds

42. When an object is removed from an NSMutableArray - that object is sent the message release;...
new instances of the class or retrieve some global property of the class.
UIView
Maintenance of state
the array relinquishes ownership of that object and no longer has a pointer to it

43. An instance is a device for maintaining state. It's a box for _ of data.
data source - view controller and delegate
Anytime you call a method with new - alloc or copy. You own and must release that object.
storage
rectangular

44. When do you take ownership?...
header files declare
collection of collections - NSArray of an NSArray
upper
Anytime you call a method with new - alloc or copy. You own and must release that object.

45. In a class method you cannot access...
the instance variables
is called every time the event occurs
NSLog routine
define it in the implemenation file

46. A UITableView usually needs three different pieces...
methods
class
instance variables
data source - delegate and view controller

47. Three ways instances are created...
ready-made instances - instantiation from scratch - and nib based instantiation
message
will be ignored
Is a placeholder object

48. A message is always contained in square brackets - and has three parts
view
dealloc - is called on the object & the object's memory is returned to the heap
receiver - selector - arguments
viewWillDissapear: and viewWillAppear:

49. Reference Counting...
%d
causes the program to immediately exit from the loop it is executing - whether its for - while or do
to give it someone else - or another object
You take ownership for an object you want to keep a pointer to

50. Designated initializer makes sure that every...
header files declare
in the dealloc - or when a Controller's view is 'unloaded'
instance variable of an object is valid
count - objectAtIndex - makeObjectsPerformSelector - sortedArrayUsingSelector - lastObject