... 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 ...
against 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. 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...
... 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...
... 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 ... 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 we go
along. There’s a handy...
... 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...
... weirdness
CHAPTER 12: Categories 2 19
Like the @interface for the category, the @implementation has the names of the class and
the category, along with the bodies of the new methods.
The
lengthAsNumber ... 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,
cha...
... 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...
... 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, ... 140
dependencies
circular dependency, handling, 96
definition of, 93
forward reference, 96
handling cross-file dependencies, 94
limiting the effects of dependency-caused...