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iOS 5 App Development Objective C

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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1. What does autorelease mean?
has one root view controller
wait until the loop finishes processing the event - at the end release it
receiver
Model Objects[Factory Worker]

2. Name of the method to be executed
message
selector[message]
type - name and value
will be ignored

3. Reducing details to focus on the core concepts
Abstraction
instance variable of an object is valid
to give it someone else - or another object
nil

4. What happens when the last owner calls release?

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5. Property List...
define it in the implemenation file
message
collection of collections - NSArray of an NSArray
safety - subclassability and makes code look more consistent with C structs

6. In general - class methods tend to be factory methods - that is...
a single-array can contain objects of different types
NSCoder
rectangular
methods for generating an instance

7. At the top of any implementation file...
you must import the header file of that class
alloc - singleton - informational utility method?
designated initializer
arguments[message]

8. UITableViewController is a subclass of...
UIViewController
you must import the header file of that class
is called every time the event occurs
in the dealloc - or when a Controller's view is 'unloaded'

9. Just a floating point number - but we always use it for graphics.
CGFloat
receiver
dealloc - is called on the object & the object's memory is returned to the heap
implementation

10. Order of the declarations for methods. _ come first - followed by _ - followed by any other methods...
attributes - behavior
causes the program to immediately exit from the loop it is executing - whether its for - while or do
Core Graphics Framework
class methods - initializers

11. When you send a message to _ - you are sending a message to _ - but demanding that the search for the method begin at the superclass....
object
self
super - self
creates an instance of NSString that holds the character string

12. A UITableView usually needs three different pieces...
in the dealloc - or when a Controller's view is 'unloaded'
data source - delegate and view controller
safety - subclassability and makes code look more consistent with C structs
alloc - singleton - informational utility method?

13. 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
message
Maintenance of state
group of global functions already assigned to this class
collection of collections - NSArray of an NSArray

14. When do you take ownership?...
Anytime you call a method with new - alloc or copy. You own and must release that object.
(id)initWithFrame:(CGRect)aRect;
ordered collection of objects - immutable
implementation

15. UIView - designated initializer...
protocol
(id)initWithFrame:(CGRect)aRect;
array[class - NSMutableArray]
creates an instance of NSString that holds the character string

16. Delegation is an object oriented approach to
arguments[message]
cannot be added to an array
instance of UIView or one of its subclasses
callbacks

17. Three ways instances are created...
copy - retain
ready-made instances - instantiation from scratch - and nib based instantiation
first responder
define it in the implemenation file

18. The only reason to temporarily own an object - is...
to give it someone else - or another object
receiver[message]
header files declare
causes the program to immediately exit from the loop it is executing - whether its for - while or do

19. NSString* s2 = [s uppercase String]; Is an example of what kind of instance?
Abstraction
ordered collection of objects - immutable
draw images
Ready-Made Instance

20. Categories are an Objective C way to add _ to an existing class without subclassing
Maintenance of state
copy - retain
will be ignored
methods

21. A view is an...
accessors - individually we call them 'getters' and 'setters'
message
method
instance of UIView or one of its subclasses

22. A class inherits all _ from its superclass and can add as many as it wants for its own purposes....
copy - retain
Hash table - Look up objects using a key to get a value.
dealloc - is called on the object & the object's memory is returned to the heap
initializers

23. If a break statement is executed from within a set of nested loops...
instance
only the innermost loop in which the break is executed is terminated
NSCoder
references to objects

24. NSArray - class...
parentViewController
protocol
attributes - behavior
ordered collection of objects - immutable

25. Files Owner...
callbacks
methods
rectangular
Is a placeholder object

26. A view represents a _ area
pointer to an object
pointer - class
rectangular
receiver

27. Class methods do not operate on an _ or have any access to _ variables....
lowercase - uppercase
data source - delegate and view controller
instance
group of global functions already assigned to this class

28. SomeClass* aVariable = [[SomeClass alloc] init]; is an example of what kind of instance?
Ready-Made Instance
Instantiation from scratch
You take ownership for an object you want to keep a pointer to
'getters' and 'setters'

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

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30. When do we need to release our outlets?

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31. Prefixing a character string with an @ symbol [specific - NSString class]...
message
creates an instance of NSString that holds the character string
data source - delegate and view controller
pointer to an object

32. 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.
UIViewController
is an instance of that class
Data Encapsulation
message

33. Variable names tend to start with a _ letter; class names tend to start with an _ letter.
lowercase - uppercase
you always return the newly initialized object(return self)
parentViewController
has one root view controller

34. [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.
for inheritance - adopting the superclasses implementation
data
instance
calling code that does the instantiation for you

35. Object Oriented based analogue to a function is called a...
CGRect
NSCoder
methods
method

36. Origin of a view's coordinate system is _ left
CGRect bounds
the array relinquishes ownership of that object and no longer has a pointer to it
you always return the newly initialized object(return self)
upper

37. Each _ has a 'designated' initializer method....
(id)initWithFrame:(CGRect)aRect;
class
nil
methods

38. 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
initializer
Functions
selector[message]
Object wrapper around primitive types like int - float - double - BOOl

39. The root view controller typically creates the next view controller - and the next _ creates the one after that
view controller
calling code that does the instantiation for you
attributes - behavior
superclass's

40. The designated initializer calls the _ designated initializer....

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41. Core foundation classes are prefixed with _ and suffixed with _
callbacks
CF - Ref
you always return the newly initialized object(return self)
class methods - initializers

42. A UITableViewController can fill all three roles of...
data source - view controller and delegate
the message release to all its entries
Abstraction
pointer to an object

43. Each class picks one _ as it's designated initializer....
initializer
type - name and value
in the dealloc - or when a Controller's view is 'unloaded'
copy - retain

44. In any application with UINavigationController - the navigation controller...
instance variables
has one root view controller
initializer
safety - subclassability and makes code look more consistent with C structs

45. 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 _.
variable scope - if defined within a block
initializer
nil
declaration and initialization of a variable

46. When an object is added to a NSMutableArray - that object is sent the message to retain;...
receiver[message]
the instance variables
Instantiation from scratch
the array becomes an owner of that object and has a pointer to it.

47. An instance is a device for maintaining state. It's a box for _ of data.
subview(s)
position
storage
pointer to an object

48. If a class declares a _ that is different from its superclass - you must override the superclass' _ to call the new _...
Model Objects[Factory Worker]
designated initializer
class methods - initializers
delegates and dataSources

49. NSSet...
Hash table - Look up objects using a key to get a value.
first responder
calling code that does the instantiation for you
unordered collection of objects - objects must be unique

50. Archiving works by creating an instance of _ - which is essentially just a container for data - and placing objects and their data inside it.
creates an instance of NSString that holds the character string
NSCoder
class's
group of global functions already assigned to this class

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iOS 5 App Development Objective C

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