Learn Objective C on the Mac phần 3 ppt
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 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 ... indicate a file that holds Objective- C code and will be pro-cessed by the Objective- C compiler. File names ending in .c are handled by the C compiler, and .cpp files are the province of the C+ +...
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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 5 potx
... 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 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...
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Learn Objective C on the Mac phần 6 potx
... different ways. The first way is [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 ... 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 ... you can work with it. Some languages, including C+ + and Java, perform object allocation and initialization in a single operation using a constructor. Objective- C splits the two operations...
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Learn Objective C on the Mac phần 7 docx
... 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, changename = @"Car";toself.name ... thing1@end // CategoryThing The interesting point to note is that a category can access the instance variables of the class it has been put onto. Category methods are first-class citizens. The contents...
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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 ... buttons to actions so they’ll trigger our code. We’ll control- drag again to make our love connections, this time from the button to the AppController.NOTEKnowing which way to drag the connection...
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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 ... 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 name ... have com-mon code sift through your data without hard-coding the conditions you’re looking for. This is another application of the Open/Closed Principle that you met back in Chapter 3. Creating...
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Learn Objective C on the Mac phần 10 doc
... 104bsearch(), 137 Build and Go button, 7 C [c] decoration, 30 5 .c file extension, 8 C preprocessor, 93 C+ +, 1–2comparing to Objective- C, 30 9embedding C+ + objects into Objective- C objects, 31 3inheritance ... 262–2 63 choosing Tools menu, Identity Inspector, 255connecting AppController to the user interface controls, 252connecting the UpperCase and LowerCase but-tons to the AppController, 260Connections ... programcolorName(), 34 drawCircle(), 33 drawShapes(), 33 main(), 32 shapes array, 33 source code, 31 Shark, 299SimpleEncoding project, source code, 270singleton architecture, 155singleton object, global, 1 73 Slant6...
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