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. Proceed through the loop - jump back to the top and check again
Continue
Used to find the time right now or to store past or future time/dates
declaration and initialization of a variable
header files declare

2. Asking a class or object to execute a method
instance of UIView or one of its subclasses
array[class - NSMutableArray]
message
is called every time the event occurs

3. Object Oriented based analogue to a function is called a...
method
NSLog routine
ready-made instances - instantiation from scratch - and nib based instantiation
a single-array can contain objects of different types

4. @property declares - and _ implements the setter and getter...
in the dealloc - or when a Controller's view is 'unloaded'
size and position
@synthesize
Data Encapsulation

5. A callback is a function that is supplied in advance of an event - and...
its dataSource
calling code that does the instantiation for you
receiver[message]
is called every time the event occurs

6. Reference Counting...
to get and set variables
setPossessionName
data source - view controller and delegate
You take ownership for an object you want to keep a pointer to

7. Inside a method - _ is an implicit local variable. Typically - _ is used so that an object can send a message to itself....
declaration and initialization of a variable
causes the program to immediately exit from the loop it is executing - whether its for - while or do
self
pointers

8. NSString* s2 = [s uppercase String]; Is an example of what kind of instance?
Encapsulation of functionality
the array becomes an owner of that object and has a pointer to it.
Ready-Made Instance
instance variables

9. Execution of the break statement...
viewWillAppear - viewDidAppear - viewWillDisappear & viewDidDisappear
superclass's
callbacks
causes the program to immediately exit from the loop it is executing - whether its for - while or do

10. In the last line of an init method...
pointer to an object
you always return the newly initialized object(return self)
receiver - selector - arguments
CGFloat

11. 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.
receiver
%d
CGRect
creating an initializer

12. Reducing details to focus on the core concepts
Model Objects[Factory Worker]
Abstraction
Functions
pointers

13. 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
safety - subclassability and makes code look more consistent with C structs
Functions
Generic object wrapper for other non-object data types
Is a placeholder object

14. Three ways instances are created...
methods
ready-made instances - instantiation from scratch - and nib based instantiation
instance variables
data

15. To load a Xib file manually - you use _
Instantiation from scratch
has one root view controller
NSBundle
(id)initWithFrame:(CGRect)aRect;

16. Categories are an Objective C way to add _ to an existing class without subclassing
its dataSource
methods
the array becomes an owner of that object and has a pointer to it.
methods for generating an instance

17. The class is responsible for what instance variables the instance has - but not the _ of those variables.
group of global functions already assigned to this class
creating an initializer
values
declaration and initialization of a variable

18. id is a...
pointer to an object
viewWillAppear - viewDidAppear - viewWillDisappear & viewDidDisappear
viewWillDissapear: and viewWillAppear:
parentViewController

19. UIView - designated initializer...
view
header files declare
instance variables
(id)initWithFrame:(CGRect)aRect;

20. Delegation is an object oriented approach to
selector[message]
collection of collections - NSArray of an NSArray
callbacks
receiver

21. Number one use of protocols in iOS...
data source - delegate and view controller
callbacks
delegates and dataSources
they need to be defined in the implementation file

22. 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
creating an initializer
Maintenance of state
Anytime you call a method with new - alloc or copy. You own and must release that object.
references to objects

23. When an object is added to a NSMutableArray - that object is sent the message to retain;...
NSBundle
collection of collections - NSArray of an NSArray
the array becomes an owner of that object and has a pointer to it.
upper

24. The root view controller typically creates the next view controller - and the next _ creates the one after that
Functions
safety - subclassability and makes code look more consistent with C structs
view controller
'getters' and 'setters'

25. To get the full path for a directory in the sandbox - you use the _ NSSearchPathForDirectoriesInDomains.
ordered collection of objects - immutable
(id)initWithFrame:(CGRect)aRect;
C Functionn
method

26. Only exists within the statement block there defined - outside of the block is fine
safety - subclassability and makes code look more consistent with C structs
variable scope - if defined within a block
the message release to all its entries
do so in viewDidLoad

27. UIViewController has several methods that get called at certain times...
viewWillAppear - viewDidAppear - viewWillDisappear & viewDidDisappear
is called every time the event occurs
do so in viewDidLoad
receiver - selector - arguments

28. Views have three properties related to their location and size: @property _ _;
dealloc - is called on the object & the object's memory is returned to the heap
message
CGRect bounds - GCPoint center - CGRect frame
ordered collection of objects - immutable

29. We can use dot notation to reference...
Generic object wrapper for other non-object data types
to get and set variables
an object's property
ready-made instances - instantiation from scratch - and nib based instantiation

30. A _ handles touch events.
view
CGRect
subview(s)
data source - delegate and view controller

31. Center and frame are used to _ your view
position
first responder
for inheritance - adopting the superclasses implementation
(id)initWithFrame:(CGRect)aRect;

32. Why properties?
safety - subclassability and makes code look more consistent with C structs
@interface ClassName:SuperClassName
message
object

33. A function in the objective c library that simply displays or logs it's argument
%d
viewWillDissapear: and viewWillAppear:
superclass's
NSLog routine

34. Hold data and know nothing about the user interface
Model Objects[Factory Worker]
the array becomes an owner of that object and has a pointer to it.
create a XIB file
methods

35. Keep view and model objects in sync - control the 'flow' of the application - and save the model objects out to the filesystem
position
Maintenance of state
Controller Objects[Managers]
the instance variables

36. A UITableView usually needs three different pieces...
CGFloat
Encapsulation of functionality
you always return the newly initialized object(return self)
data source - delegate and view controller

37. A method in a _ is required unless its preceded by an @optional.
Maintenance of state
Generic object wrapper for other non-object data types
they need to be defined in the implementation file
protocol

38. A message is always contained in square brackets - and has three parts
receiver - selector - arguments
a mechanism to enable specific callbacks
Continue
Anytime you call a method with new - alloc or copy. You own and must release that object.

39. 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.
is an instance of that class
an object's property
implementation
has one root view controller

40. If a break statement is executed from within a set of nested loops...
first responder
references to objects
accessors - individually we call them 'getters' and 'setters'
only the innermost loop in which the break is executed is terminated

41. In Objective C - the name of a setter method is set plus the name of the instance variable it is changing - for example PossessionName would be...
NSBundle
copy - retain
You take ownership for an object you want to keep a pointer to
setPossessionName

42. A collection object - an ordered list of objects that can be accesed by an index
CGRect
in the dealloc - or when a Controller's view is 'unloaded'
array[class - NSMutableArray]
%d

43. Class methods typically either create
is an instance of that class
new instances of the class or retrieve some global property of the class.
protocol
safety - subclassability and makes code look more consistent with C structs

44. Name of the new class - it's superclass - the instance variables that each instance of this class has - and any methods this class implements
declaration and initialization of a variable
array[class - NSMutableArray]
header files declare
the message release to all its entries

45. For view controllers that are closely related - like a table view controller and its detail view controller - you can simply give them _ that point to each other.
self
data
array[class - NSMutableArray]
instance variables

46. A delegate is a pointer to an object with a set of methods the delegate-holder knows how to call. In other words - it's _ from a later created object
Data Encapsulation
variable scope - if defined within a block
a mechanism to enable specific callbacks
size and position

47. An instance is a device for maintaining state. It's a box for _ of data.
storage
CGFloat
NSBundle
to get and set variables

48. When making a tableView always...
NSLog routine
reuse your cells
Controller Objects[Managers]
the array becomes an owner of that object and has a pointer to it.

49. Instance Variables by default are called @protected meaning...
UIViewController
CGRect bounds - GCPoint center - CGRect frame
only the class and subclasses can access
CGFloat

50. The only reason to temporarily own an object - is...
to give it someone else - or another object
you always return the newly initialized object(return self)
message
values

Test your basic knowledge |

iOS 5 App Development Objective C

13 Skills Types | 550 Pages | Only $9.95 | PDF / EPub, Kindle Ready

Top Scores

Link to This Test

Related Subjects