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. If you have extra work you want to do on the view...
do so in viewDidLoad
a single-array can contain objects of different types
(id)initWithFrame:(CGRect)aRect;
dealloc - is called on the object & the object's memory is returned to the heap

2. A view is a subclass of _
message
Model Objects[Factory Worker]
UIView
retain

3. All objects are accessed using...
ready-made instances - instantiation from scratch - and nib based instantiation
pointers
header files declare
method

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

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

5. NSArray - important methods...
methods
wait until the loop finishes processing the event - at the end release it
Controller Objects[Managers]
count - objectAtIndex - makeObjectsPerformSelector - sortedArrayUsingSelector - lastObject

6. We can use dot notation to reference...

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

7. A command directed to an object is called an...
viewWillAppear - viewDidAppear - viewWillDisappear & viewDidDisappear
Controller Objects[Managers]
to give it someone else - or another object
message

8. Objective C only allows for single inheritance - so in regards to class you only ever see the following pattern
instance of UIView or one of its subclasses
Encapsulation of functionality
storage
@interface ClassName:SuperClassName

9. Designated initializer makes sure that every...
Is a placeholder object
self
instance variable of an object is valid
the message release to all its entries

10. NSString* s2 = [s uppercase String]; Is an example of what kind of instance?
define it in the implemenation file
instance
Ready-Made Instance
subview(s)

11. 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 _.
unordered collection of objects - objects must be unique
variable scope - if defined within a block
nil
calling code that does the instantiation for you

12. When an object is removed from an NSMutableArray - that object is sent the message release;...
subview(s)
the array relinquishes ownership of that object and no longer has a pointer to it
implementation
unordered collection of objects - objects must be unique

13. Object Oriented based analogue to a function is called a...
method
Maintenance of state
the array becomes an owner of that object and has a pointer to it.
initializers

14. Each _ has a 'designated' initializer method....
first responder
NSLog routine
delegates and dataSources
class

15. Primitives and C Structures...
'getters' and 'setters'
cannot be added to an array
for inheritance - adopting the superclasses implementation
class methods - initializers

16. Just a floating point number - but we always use it for graphics.
CGFloat
the instance variables
count - objectAtIndex - makeObjectsPerformSelector - sortedArrayUsingSelector - lastObject
ready-made instances - instantiation from scratch - and nib based instantiation

17. Files Owner...
Is a placeholder object
receiver
Controller Objects[Managers]
dealloc - is called on the object & the object's memory is returned to the heap

18. A function in the objective c library that simply displays or logs it's argument
copy - retain
'getters' and 'setters'
viewWillDissapear: and viewWillAppear:
NSLog routine

19. C struct with a CGPoint origin and a CGSize size - in other words two c structs.
copy - retain
superclass's
CGRect
view controller

20. Typically the designated initializer has parameters for the most important and frequently used _ of an object
count - objectAtIndex - makeObjectsPerformSelector - sortedArrayUsingSelector - lastObject
attributes - behavior
instance variables
message

21. Why properties?
safety - subclassability and makes code look more consistent with C structs
define it in the implemenation file
Maintenance of state
variable scope - if defined within a block

22. NSDate - class...
accessors - individually we call them 'getters' and 'setters'
self
instance variables
Used to find the time right now or to store past or future time/dates

23. The root view controller typically creates the next view controller - and the next _ creates the one after that
class
define it in the implemenation file
view controller
CGRect

24. A message is always contained in square brackets - and has three parts
class
its dataSource
has one root view controller
receiver - selector - arguments

25. id is a...
Functions
to give it someone else - or another object
Instantiation from scratch
pointer to an object

26. If a break statement is executed from within a set of nested loops...
unordered collection of objects - objects must be unique
ready-made instances - instantiation from scratch - and nib based instantiation
only the innermost loop in which the break is executed is terminated
references to objects

27. 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....
Encapsulation of functionality
a mechanism to enable specific callbacks
first responder
define it in the implemenation file

28. When an object is added to a NSMutableArray - that object is sent the message to retain;...
Data Encapsulation
cannot be added to an array
the array becomes an owner of that object and has a pointer to it.
receiving and handling events that are associated with it

29. An instance is a device for maintaining state. It's a box for _ of data.
storage
alloc - singleton - informational utility method?
NSBundle
viewWillAppear - viewDidAppear - viewWillDisappear & viewDidDisappear

30. Core foundation classes are prefixed with _ and suffixed with _
storage
CF - Ref
NSLog routine
receiver

31. Instance Variables by default are called @protected meaning...
position
wait until the loop finishes processing the event - at the end release it
only the class and subclasses can access
viewWillAppear - viewDidAppear - viewWillDisappear & viewDidDisappear

32. Defining variables - three parts...
size and position
delegates and dataSources
alloc - singleton - informational utility method?
type - name and value

33. NSString *s = @'Hello - World'; is an example of...
superclass's
class
Encapsulation of functionality
declaration and initialization of a variable

34. Reference Counting...
initializer
draw images
the array becomes an owner of that object and has a pointer to it.
You take ownership for an object you want to keep a pointer to

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

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

36. In a class method you cannot access...
superclass's
instance variables
receiver[message]
the instance variables

37. [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.
data
Instantiation from scratch
values
instance variables

38. UIImageView is used to...
implementation
unordered collection of objects - objects must be unique
Is a placeholder object
draw images

39. @property declares - and _ implements the setter and getter...
@synthesize
Used to find the time right now or to store past or future time/dates
NSBundle
view controller's initialization method

40. 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
Functions
CGRect
will be ignored
to get and set variables

41. Categories are an Objective C way to add _ to an existing class without subclassing
wait until the loop finishes processing the event - at the end release it
Anytime you call a method with new - alloc or copy. You own and must release that object.
instance variables
methods

42. Each object does its own job - and presents to the rest of the world - to other objects - and indeed in a sense to the programmer - an opaque wall whose only entrances are the methods to which it promises to respond and the actions it promises to per
Functions
Encapsulation of functionality
draw images
data source - view controller and delegate

43. To get the full path for a directory in the sandbox - you use the _ NSSearchPathForDirectoriesInDomains.
self
You take ownership for an object you want to keep a pointer to
the instance variables
C Functionn

44. UITableViewController is a subclass of...
UIViewController
CGRect bounds
values
Anytime you call a method with new - alloc or copy. You own and must release that object.

45. NSDictionary...
instance variables
class
Model Objects[Factory Worker]
Hash table - Look up objects using a key to get a value.

46. Delegation is an object oriented approach to
selector[message]
setPossessionName
copy - retain
callbacks

47. Keep view and model objects in sync - control the 'flow' of the application - and save the model objects out to the filesystem
CF - Ref
message
Encapsulation of functionality
Controller Objects[Managers]

48. Classes describe two things...
Functions
attributes - behavior
CGRect bounds - GCPoint center - CGRect frame
nil

49. It's class is sent the message alloc - which creates an instance of that class and returns a pointer to it - and then that instance is sent the message init - which gives its instance variables initial values.
dealloc - is called on the object & the object's memory is returned to the heap
class's
retain
creating an initializer

50. A view represents a _ area
viewWillAppear - viewDidAppear - viewWillDisappear & viewDidDisappear
rectangular
has one root view controller
implementation