... 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...
... 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 ... the data. Functions are the
center of the procedural programming experience: you decide which functions you want to
use, and then you call those functions, passing in the data t...
... 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...
... 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...
... 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...
... NSDictionary
hold collections of objects. These objects are immutable: they can’t change after you create
them. Cocoa provides mutable versions of these classes, which let you change their contents ... 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 th...
...
[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...
... 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...
... Inspector, 255
connecting AppController to the user interface
controls, 252
connecting the UpperCase and LowerCase but-
tons to the AppController, 260
Connections panel, 260
creating the AppController, ... 143
See also Xcode
code folding, 1 17
code generation, 206
Code Sense (code completion), 106
collection classes, 141
collection property list classes
NSArray, 2 67
NSDictionary,...