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Click next. Give your class a name (I’m going to call it “Person”), and click finish.
Now we have two files. For me they are Person.h and Person.m.
The .h files has an interface, it starts with “@interface” and ends with “@end”. Here is where you say to the world how you are going to define your class. Inside the curly braces is where we define the variables and outside you define the public methods names and the parameters it is going to receive. Other kind of methods, like the private ones are defined in the implementation.
Let’s add a variable.
@interface Person : NSObject { NSString *Name; } @endI added a name which is a string. Now let’s add some behaviors (Remember, outside the curly braces).
- (void) walk; - (void) setName: (NSString) a;I typed a minus (-) sign because this is an instance level method, this are me mayority of the methods that we are going to use. If you see at any moment one with a plus (+) sing, that means it is a class level method. Within parenthesis i typed void because this is a procedure, it does not returns any value. The second procedure takes a value, we are going to talk about it when we talk about method specifically.
Your “.h” file should look like this:
#import @interface Person : NSObject { NSString *Name; } - (void) walk; - (void) setName: (NSString *) a; @end Methods

Open Person.m. Within the @implementation we are going to say what our methods do. Let’s add the methods.
-(void) walk { NSLog(@"Hi, i'm @% and i'm walking",Name); } -(void) setNameNSString *)a{ Name = a; }In the first method we use NSLog, it is a built in method, it is used to print out messages through the console. You can open it at Run->Console if you want to test this codes when we finish the tutorial.
The @% sign means that there goes a string variable, it is specified at the end of the line, in this case the name of the person.
The second method sets the value of the name to a. In Objective-C, parameters are not defined like most of other languages, it has to be done like you where talking to the computer. A better example of it could be this:
-(void) CreateHouseNSString *)name withNumberOfDoorsint)numDoors andWindowsColorNSString *)color;After this your implementation file should look like this:
#import "Person.h" @implementation Person -(void) walk { NSLog(@"Hi, i'm %@ and i'm walking",Name); } -(void) setNameNSString *)a{ Name = a; } @endNow Calling methods is very easy. You have to create an instance of the class and call the method you need. For example, if you are willing to test your code and you created a Command Line Utility with Foundation Tool, you are going to find a file that has the same name of your project in the “Source” folder. Open it.
There is the main function, it is the first that is called when the application start.
Let’s import the class we just created adding #import “Person.h” right after #import and erase everything within the main method except for the return command.
Now we create an instance of our class:
Person *p = [Person new];Then we set the name by calling a method. In Objective-C we call methods within [ ]:
[p setName"Oscar"];We are saying, object p set the name of the person to “Oscar”
And finally we call the walk method:
[p walk];Your main file should look like this:
#import #import "Person.h" int main (int argc, const char * argv[]) { Person *p = [Person new]; [p setName"Oscar"]; [p walk]; return 0; }Now if you want to test it you have to go to Run->Console, and hit “Build and Run”
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Conclusion

We have learned the very basics of Objective-C. In the next tutorial we are going to talk about memory management, delegation and we are going to build a basic iphone app start working with some interaction.

Here is some good resources. To get you learning....

E-Books :
Objective-C For Dummies

The only thing hotter than the iPhone right now is new apps for the iPhone. Objective–C is the primary language for programming iPhone and Mac OS X applications, and this book makes it easy to learn Objective–C.


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Head First iPhone Development

A Learner's Guide to Creating Objective-C Applications for the iPhone

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Cocoa Programming for Mac OS X (3rd Edition)


Addison-Wesley Professional | ISBN: 0321503619 | May 15, 2008 | 464 pages | PDF | 18 MB
If you’re developing applications for <Bạn vui lòng đăng nhập hoặc đăng ký để xem được nội dung này!>

  X, Cocoa® <Bạn vui lòng đăng nhập hoặc đăng ký để xem được nội dung này!>

  for Mac® OS X, Third Edition, is the book you’ve been waiting to get your hands on. If you’re new to the Mac environment, it’s probably the book you’ve been told to read first. Covering the bulk of what you need to know to develop full-featured applications for OS X, written in an engaging <Bạn vui lòng đăng nhập hoặc đăng ký để xem được nội dung này!>

  style, and thoroughly class-tested to assure clarity and accuracy, it is an invaluable resource for any Mac programmer.
Download Links (18 Mb)
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Mirror :
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Pass :joinebook.com