Learn Objective C on the Mac phần 2 docx
Learn Objective C on the Mac phần 2 docx
... 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 ... rectangle) is consulted to see what its class is. 2. The rectangle class checks its pile of code and gets the address of the draw function. 3. Objective- C runs the code that draws a rectangle.This ... makes the interface work. In our examples, the implementation for the circle object holds the code for drawing a circle on the screen. When you send the draw message to a circle object, you don’t...
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Learn Objective C on the Mac phần 7 docx
... protocols are just like Java interfaces. In fact, Objective- C protocols were the inspiration for Java’s interfaces.CHAPTER 12: Categories 228 Scrolling lists in Cocoa are handled by the AppKit class ... weirdness CHAPTER 12: Categories 21 9Like 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 ... can exert control over how the Cocoa object behaves.CHAPTER 12: Categories234One of the classes in the AppKit is called NSTimer; it can send a message to an object repeat-edly, which is very...
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Learn Objective C on the Mac phần 1 pdf
... 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 for easy access. You ... read on! Learn Objective- C on the Mac Penciled by MARK DALRYMPLEInked by SCOTT KNASTERCHAPTER 2: Extensions to C 13Here’s another cool fact about NSString: the name itself highlights one of the...
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Learn Objective C on the Mac phần 3 ppt
... 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 descriptions, ... message to the Circle object, the dispatcher first consults the Circle class to see if it can respond to setFillColor: with its own code. In this case, the answer is no: the dispatcher discovers...
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Learn Objective C on the Mac phần 4 pptx
... 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 cheat sheet at the ... (same as the as command- right arrow). ■ control-T: Transpose (swap) the characters on either side of the cursor. ■ control-D: Delete the character to the right of the cursor. ■ control-K:...
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Learn Objective C on the Mac phần 5 potx
... characters adjacent to the cursorControl-D Delete the character to the right of the cursorControl-K Delete the lineControl-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 methods. The class object also contains ... 8-1.CHAPTER 7: More About Xcode 128 The last button is step out (press ⌘⇧T), which will let the current function finish and then return control to you on the next line of the calling function....
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Learn Objective C on the Mac phần 6 potx
... [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 stages. A common beginner’s ... this, we’ll change the @interface section of the Car class to use a mutable array (the changed line of code is in bold):#import <Cocoa/Cocoa.h>@class Tire;@class Engine;CHAPTER 9: Memory...
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Learn Objective C on the Mac phần 8 pot
... 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 the Connections ... button to AppController.Control-click the UpperCase button, and drag a wire to AppController, as shown in Figure 14 -20 .One you’ve drawn the wire from the button to AppController, select uppercase:...
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Learn Objective C on the Mac phần 9 ppsx
... of namespaces. C+ + vtable vs. Objective- C Dynamic DispatchOne 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. The “distinct” part of the ... attributes. We could have made a class method on Car, or made some kind of factory class, but Objective- C is still C, so we can use functions. Here, we’re using a function, because it keeps the code...
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Learn Objective C on the Mac phần 10 doc
... attributes, 21 2nonatomic, 21 2readonly and readwrite attributes, 21 4@protocol, 23 6@required, 24 6@selector(), 23 3@ sign, 11, 17@“string”, 22 0@sum, 28 8@synthesize, 20 6, 21 2 21 4, 27 2, 27 8, 28 0, 28 5@try, ... the UpperCase and LowerCase but-tons to the AppController, 26 0Connections panel, 26 0creating the AppController, 25 5creating the UpperCase and LowerCase buttons, 25 7Dock window, 25 4 25 5dragging ... 49Interface Builderapplication’s menu bar, 25 4awakeFromNib message, 26 2 26 3choosing Tools menu, Identity Inspector, 25 5connecting AppController to the user interface controls, 25 2connecting the...
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