... with each method call. The compiler needs to see the entire contents of the class to
correctly calculate the location of the instance variables.
Next on the operating table is Slant6. Create the ... bring up the menu, you can use control- period to cycle through the options
or shift-control- period to cycle backward. Don’t worry if you don’t catch all the shortcuts as...
... that contains the code
for Hello Objective- C.
Hello Objective- C. m contains boilerplate code, kindly provided by Xcode for each new proj-
ect. We can make our Hello Objective- C application a ... Hello Objective- C folder.
To create the project, start by launching Xcode. You can find the Xcode appli-
cation in /Developer/Applications. We put the Xcode icon in the Dock...
... soon become very important:
■
The interface is the description of the features provided by a class of objects. For
example, the interface for class Circle declares that circles can accept the ...
extension to the C language. @interface Circle says to the compiler, “Here comes the
interface for a new class named Circle.”
NOTE
NSObject in the @interface line tells the...
... you can construct a string that describes all sorts of information about
the object, such as the fat content and calories for the cheese Danish. The description
method for Cocoa’s NSArray class, ... which manages a collection of objects, provides informa-
tion about the array itself, such as the number of objects it contains and descriptions of each
object it contains. These des...
... characters adjacent to the cursor
Control-D Delete the character to the right of the cursor
Control-K Delete the line
Control-L Center the cursor in the text editor
⌘⌥D Show the Open Quickly window
⌘⌥↑
Open ... class, it creates a class object that represents the class. The class object
contains pointers to the superclass, class name, and to the list of the class’s...
...
[SomeClass new], and the second is [[SomeClass alloc] init]. These
two techniques are equivalent, but the common Cocoa convention is to use
alloc and init rather than new. Typically, Cocoa programmers ... perform object allocation and initialization in a single operation using
a constructor. Objective- C splits the two operations into explicit allocation
and initialization stage...
... ever be cleaned up. Car’s dealloc won’t get called until the
engine releases the car in its dealloc, and the engine’s dealloc won’t get called until car’s dealloc
releases the Engine. They just ... variable, which has been changed. We can choose to do a search and
replace on the name, or we can change direct ivar access to use accessors instead. In init,
change
name = @"C...
... car is allocated by sending
allocWithZone: to the class of the object that’s
receiving this message:
Car *carCopy;
carCopy = [[[self class]
allocWithZone: zone]
init];
CarParts-copy contains ... do the same thing, but this time, control- drag
from the AppController to the Label, and choose the
resultsField item to make that connection.
Double-check your work by choosing...
... of namespaces.
C+ + vtable vs. Objective- C Dynamic Dispatch
One of the biggest differences between C+ + and Objective- C is the mechanism of dispatch-
ing methods (or member functions, as they’re ... each object of that collection, then turns the resulting values into a collection. The
“union” part of the name refers to taking the union of a bunch of objects. The “dist...
... std::string.
You can put pointers to Objective- C objects into C+ + objects. Since all Objective- C objects
are dynamically allocated, you can’t have complete objects embedded in a class or declared
on a stack. ... *piece[32];
}
@end // SWChessBoard
C+ + objects embedded in Objective- C objects, rather than having a pointer relationship, will
have their constructors called whe...