chap 12 to 14 - objective-C

Question 1

message send

Answer 1

always surrounded by square brackets.always has two parts:

• a pointer to the object that is receiving the message.
• the name of the method to be triggered.

Question 2

objects in memory

Answer 2

Question 2

framework

Answer 2

a library of classes that you use to write programs.

Question 3

method

Answer 3

a function triggered by a message.

Question 4

object

Answer 4

holds data like a structure except that it also contains a set of functions that act upon that data.

Question 5

class

Answer 5

describes a particular type of object. This description includes methods and instance variables where an object of this type stores its data. You ask a class to create an object of its type for you on the heap. We say that the resulting object is an instance of that class.

Question 6

message send

Answer 6

always surrounded by square brackets. always has two parts: a pointer to the object that is receiving the message. the name of the method to be triggered.

Question 7

id

Answer 7

a pointer of some kind of Objective-C object. id delegate; no asterisk needed. id implies the asterisk.

Question 8

class method

Answer 8

you cause the method to execute by sending a message to the class. the method returns a pointer to an instance of that class. NSDate *now = [NSDate date];

Question 9

instance method

Answer 9

You cause the method to execute by sending a message to an instance of a class. double seconds = [now timeIntervalSince1970];

Question 10

alloc

Answer 10

class method that returns a pointer to a new object that needs to be initialized. Pointer is then used to send the new object the message intit. NSDate *now = [[NSDate alloc] init];