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CS193pSpring 2010

Wednesday, March 31, 2010

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Enrollment Closed

You should have received an e-mailIt will confirm your grading status (P/NC or not)

As usual, we were oversubscribed for grading option

Sorry to anyone who didnt get the option they wanted

If you received e-mail, but are not in Axess, do it!

... and an invitation to iPhone Developer Program

If not, e-mail [email protected].

mailto:[email protected]:[email protected]:[email protected]

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Communication

E-mailQuestions are best sent to [email protected]

Sending directly to instructor or TAs risks slow response.

Web SiteVery Important!http://cs193p.stanford.eduAll lectures, assignments, code, etc. will be there.

This site will be your best friend when it comes to getting info.

http://cs193p.stanford.edu/http://cs193p.stanford.edu/http://cs193p.stanford.edu/mailto:[email protected]:[email protected]

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Office Hours

AndreasMonday 6pm to 8pm

Thursday 6pm to 8pmGates B26A

Bring your Stanford ID card for access to the building

SonaliFriday 11am to 1pm

Thursday 1pm to 3pm

Gates B26B


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Todays Topics

MVCCalculator

Objective-CDeclaring and implementing objects

Sending messages between objects

Interface BuilderWiring up objects to send messages to each otherSetting up the properties of objects

XcodeManaging all your codeRunning your application in the simulator


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Our Calculator

Model View

Controller

CalculatorViewController

CalculatorBrain

UILabel


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@interface

@end

Model

Header File (public API)


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@interface CalculatorBrain

@end

Model



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#import

@interface CalculatorBrain : NSObject

doubleoperand;{

}

@end

Model



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#import


doubleoperand;{

}

- (void)setOperand:(double)anOperand;

- (double)performOperation:(NSString *)operation;

@end

Model



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Specifying void as the return type meansthat this method returns no value.

#import


doubleoperand;{

}



@end

Model



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#import


doubleoperand;{

}



@end

The name of this method is setOperand:

Model



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#import


doubleoperand;{

}



@end

It takes one argument, a double called anOperand

Model



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#import


doubleoperand;{

}



@end

Dont forget a semicolon here!

Model



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#import


doubleoperand;{

}



@end

This method returns a double.

Model



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#import


doubleoperand;{

}



@end

It takes a pointer to an NSString object as its argument.Thats right, were passing an object to this method.

Model



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#import


doubleoperand;{

}



@end

- (NSArray *)foo:(int)zap bar:(id)pow;

Model



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#import


doubleoperand;{

}



@end


This method takes two arguments and is called foo:bar:

Model



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#import


doubleoperand;{

}



@end


It returns a pointer to an NSArray(a collection class in Foundation).

Model



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#import


doubleoperand;{

}



@end


The second argument is of type idThis means a pointer to *ANY* kind of object!

Model



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#import


doubleoperand;{

}



@end


Model



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#import


doubleoperand;{

}



@end

Model



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#import CalculatorBrain.h

@implementation CalculatorBrain

@end

Model

Implementation File(private and public)


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@end

- (double)performOperation:(NSString *)operation

{

return aDouble;}

- (void)setOperand:(double)anOperand{

}

Model



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@end


{

return aDouble;}


}

No semicolon this time!

Model



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@end


{

return aDouble;}


}

[operation sendMessage:argument];

Model



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@end


{

return aDouble;}


}


Square brackets mean send a message.

Model



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@end


{

return aDouble;}


}


This is the object to send the message to(in this case, the NSString called operation that was

passed as an argument to performOperation:).

Model



l t ti il

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@end


{

return aDouble;}


}


This is the message to send.

Model



I l t ti Fil

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@end


{

return aDouble;}


}


And this is its one (in this case) argument.

Model



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Controller

@end

:

#import

@interface CalculatorViewController UIViewController

IBOutlet UILabel * display;

{

}

- (IBAction)digitPressed:(UIButton *)sender;

CalculatorBrain * brain;

- (IBAction)operationPressed:(UIButton *)sender;


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Controller

@end

:

#import



{

}




Our Controller inherits from

UIViewController. UIKitsupports MVC primarily

through this class.


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Controller

@end

:

#import



{

}




This is going to point to ourCalculatorBrain Model


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Controller

@end

:

#import



{

}




ViewThese hook up to our


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Controller

@end

:

#import



{

}




View

Model


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CalculatorViewController.xib


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Files Owner is our

Controller

CalculatorViewController.xib


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