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. What is used in lieu of pixels? And why?
Points - to achieve device-independence
The compiler adds code to count references.
Center of the frame - which is in the superview's coordinate system
An outlet.


2. What do I use for a hash table/associative array? And is it mutable?

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3. How to tell whether an object implements a particular method? (A line of code)
[Class respondsToSelector:@selector(aMethod)]
Instance variable (ivar) or 'backing variable'
for...in; don't change things inside the loop.
zero/nil


4. ______ is a pointer to any object.
id
Introspection - with the class method 'class'
The runtime system asks the object what its class is.
iOS; when the view is loaded.


5. In the initializer methods of objects I create - add what line of code? Why?
Getter and setter methods.
Don't use id for a pointer. Use the actual type pointed to. It allows the compiler (but not the runtime!) to help find bugs.
id; an object pointer
self = [super init] {if init is the designated initializer of the superclass}. If the superclass init routine fails - I will know to return nil from my init routine.


6. What is the makeup of a CGRect?
At runtime.
constant NSString
A CGPoint and and a CGSize
Argument validation.


7. What is the iOS term for a library?
The runtime system asks the object what its class is.
A framework.
NSUserDefaults - which stores a property list.
Yes. The controller knows everything about the model.


8. Is NSString mutable or not?
One; zero to many
The compiler adds code to count references.
Yes. As much as it wants.
Immutable. But there are many methods that take an NSString and returned a modified one. This is fast and preferable to using NSMutableString.


9. What is the makeup of a CGSize?
No - it gets the data from the controller.
In the getter! This is called lazy instantiation.
NSSet; no - it's immutable
Two floats - for width and height


10. Why are properties good?
Introspection - with the class method 'class'
No. Use NSMutableArray - which is a subclass of NSArray.
Properties; instance variables
(1) We can validate (e.g. bounds-check) any sets done by a subclass. (2) We can lazily instantiate - so things only get created if and when they are needed.


11. What is the makeup of a CGPoint?
Argument validation.
Two CGFloats for x and y
[Object isKindOfClass:[Classname class]]
No. It's fine.


12. What do I use for an ordered collection of objects? And is it mutable?

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13. ________ implements the getter and setter. But we can always__________
addSubview; removeFromSubview
@synthesize; write our own getter and/or setter.
id; an object pointer
1) Create a context 2) Create paths 3) Set colors - fonts - widths 4) Stroke or fill the above-created paths.


14. How to access the controller's top view?
No - it gets the data from the controller.
self.view
Getter and setter methods.
Never!


15. How to tell whether an object is of a class or class that inherits from that class? (Write a line of code)
[Object isKindOfClass:[Classname class]]
self.view
constant NSString
Getter and setter methods.


16. You can send a message to a...
constant NSString
NSSet; no - it's immutable
the controller's minions. Gets things to the screen.
iOS; when the view is loaded.


17. The basic steps in custom drawing.
Don't use id for a pointer. Use the actual type pointed to. It allows the compiler (but not the runtime!) to help find bugs.
1) Create a context 2) Create paths 3) Set colors - fonts - widths 4) Stroke or fill the above-created paths.
[Class respondsToSelector:@selector(aMethod)]
@interface JGEmailLoginEmailViewController(){ NSMutableData _receivedData; }@property (weak -nonatomic) JGAppDelegate appDelegate;@property (weak - nonatomic) IBOutlet UITextField *txtfldEmailAddress;@end


18. What to do in Xcode for short documentation? For full documentation?
In the getter! This is called lazy instantiation.
1) Create a context 2) Create paths 3) Set colors - fonts - widths 4) Stroke or fill the above-created paths.
self
option-click; option-double-click


19. What do I use for a bag of bits?
A collection of collections in graph form. Can include NSArray - NSDictionary - NSNumber - NSString - NSData - and NSData.
NSData
To zero; so pointers are nil.
1.) Ask another object to do it - e.g. with mutableCopy. 2.) Call a class method - 3.) [[Classname alloc] init];


20. Where do I initialize properties?
In the getter! This is called lazy instantiation.
Override drawRect:
If it's in the header file - it's public. To make some private variables - you can put a private interface section at the top of an implementation file.
A rectangular area


21. What does 'strong' mean?

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22. How many superviews does a view have? How many subviews?
[[UIView alloc] initWithFrame]
One; zero to many
NSSet; no - it's immutable
In the getter! This is called lazy instantiation.


23. What does a view (UIView) represent?
self
A rectangular area
NSDictionary; no - it's immutable.
Lazy instantiation.


24. Class methods are used for ___________ and the call starts with ____________.
Creating objects - or finding information relative to the class. The name of the class is the first thing in the square brackets.
Points - to achieve device-independence
self
(1) We can validate (e.g. bounds-check) any sets done by a subclass. (2) We can lazily instantiate - so things only get created if and when they are needed.


25. A _______ goes from the Controller to the View. A ________ goes from the view to the controller.
iOS; when the view is loaded.
Cocoa Touch - Media - Core Services - Core OS
Outlet; Action
NSSet; no - it's immutable


26. A property is just the combination of _______.
Getter and setter methods.
Two CGFloats for x and y
Nothing happens - and nil is returned.
Other MVC trios.


27. What if I want to put a scalar into an NSArray or NSSet?
MVC - for model-view-controller
To zero; so pointers are nil.
NSData
Wrap it in NSValue. And remember that NSValue immutable.


28. Dot notation does what?
On left side - is calling the setter - and on the right side - is calling the getter.
Yes. As much as it wants.
Designated initializer.
Creating objects - or finding information relative to the class. The name of the class is the first thing in the square brackets.


29. Use ______ to send debugging messages to the console. Use _____ for any object - which should return an string. Can also use ______.
constant NSString
id
Argument validation.
NSLog; %@; %d and other formatters


30. Calling a method on id works just fine because....?
'Keep this in the heap until I don't point to anymore.' I won't point to it anymore if I set my pointer to nil - or if I am removed from the heap because no one points strongly to me.
NSData
The runtime system asks the object what its class is.
(1) We can validate (e.g. bounds-check) any sets done by a subclass. (2) We can lazily instantiate - so things only get created if and when they are needed.


31. Is NSArray mutable?
option-click; option-double-click
Wrap it in NSValue. And remember that NSValue immutable.
No. Use NSMutableArray - which is a subclass of NSArray.
[Object isKindOfClass:[Classname class]]


32. A _______ is how a view notifies the controller of something - for example - a button press.
1) Create a context 2) Create paths 3) Set colors - fonts - widths 4) Stroke or fill the above-created paths.
Action
No. It's fine.
Creating objects - or finding information relative to the class. The name of the class is the first thing in the square brackets.


33. In synthesize: @synthesize foo = _foo; The __foo_ is the ____________ or also known as the ___________________.

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34. How to create a UIView in code?
UIWindow
create a model
[[UIView alloc] initWithFrame]
'Keep this in the heap until I don't point to anymore.' I won't point to it anymore if I set my pointer to nil - or if I am removed from the heap because no one points strongly to me.


35. How are local variables initialized in iOS 5?
Dash - Plus sign.
To zero; so pointers are nil.
internal origin and size. Use this inside a view
UIViewController.


36. How is ARC done?
1) Create a context 2) Create paths 3) Set colors - fonts - widths 4) Stroke or fill the above-created paths.
Action
'Keep this in the heap as long as someone else points to it strongly. If it gets thrown out of the heap - set my pointer to it to nil.'
The compiler adds code to count references.


37. How can I find out the class of any object? Give a line of code.
Yes. As much as it wants.
Creating objects - or finding information relative to the class. The name of the class is the first thing in the square brackets.
self
Class XX = [Object class]


38. Can the controller talking to the view?
On left side - is calling the setter - and on the right side - is calling the getter.
Yes. As much as it wants.
create a model
Introspection - with the class method 'class'


39. When is it OK to call drawRect: directly?
Never!
self = [super init] {if init is the designated initializer of the superclass}. If the superclass init routine fails - I will know to return nil from my init routine.
No - it gets the data from the controller.
A rectangular area


40. What does the controller do?
Creating objects - or finding information relative to the class. The name of the class is the first thing in the square brackets.
Override drawRect:
Controls how the model is presented onscreen.
Cocoa Touch - Media - Core Services - Core OS


41. Are local pointers to objects strong or weak? So what happens at the end of the routine?
NSData
Cocoa Touch - Media - Core Services - Core OS
Strong. Object memory is freed at the end of the routine.
The document; possibly a database.


42. Instead of 'include' statements - in Objective-C we use _______ which does ________
for...in; don't change things inside the loop.
MVC - for model-view-controller
Import / handle multiple inclusion.
[Class respondsToSelector:@selector(aMethod)]


43. How to see all actions - outlets - incoming/outgoing segues on a view?
Other MVC trios.
Right-click on view - or even a subview like a button.
NSDictionary; no - it's immutable.
Cocoa Touch - Media - Core Services - Core OS


44. All properties are initialized to _____
NSLog; %@; %d and other formatters
A CGPoint and and a CGSize
zero/nil
Dash - Plus sign.


45. Remember that it's cool to...
addSubview; removeFromSubview
Can handle any language because it uses Unicode.
Yes. The controller knows everything about the model.
line up the colons!


46. What is static typing? Why is it good?

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47. What is the fundamental design pattern of iOS development?
MVC - for model-view-controller
Interface; Implementation
Import / handle multiple inclusion.
Two CGFloats for x and y


48. There is no difference between _____ and _______ at runtime.
Two floats - for width and height
zero/nil
id; an object pointer
create a model


49. What is at the top of the view hierarchy?
[[UIView alloc] initWithFrame]
UIWindow
[Object isKindOfClass:[Classname class]]
Dash - Plus sign.


50. What is the word for checking/verifying the type of an object?

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