The Learning Center App

App Description: The Learning Center is the Ultimate tool to assist your child in learning there letters, numbers, and Words. This Tab-Based App is designed to entertain your child while learning there ABC'S, 123'S, and even simple words. Recommended by Oprah the Learning Center will have you child ready for Pre-school and/or Kindergarden.

Operators in Objective C.

Operator	Function
+	Addition
-	Substraction
/	Division
*	Multiplication
%	Modulus

Relational operators

Operator	Function
>	Greater then
>=	Greater then or equal to
==	Equal to
!=	Not equal to
<=	Less then or equal to
<	Less then

Logical operators

Operator	Function
&&	AND
||	OR
!	NOT

Arrays in XCODE 3.2.3 and IPHONE SDK 4

How to create an Array:

To create an Array with the name testArray do the following:

NSArray *testArray = [[NSArray alloc] init];

The Array called  an empty array.

Add something to the array

[testArray addObject:someObject];

[testArray addObject:someOtherObject];

// Get stuff out of the array

NSObject *anObject = [testArray objectAtIndex:0];

// Loop through contents of array

for (NSObject *anObject in testArray) {

     

}

// Remove from array

[testArray removeObjectAtIndex:1];

How to send a Variable to an UILAERTVIEW

In this example there is a variable called Score in the program. You want to display the user's Score in a UIAlertview. User the following code.

NSString* messageString = [NSString stringWithFormat: @"End of Test. Your Score is: %d", Score]; 

UIAlertView *alert = [[UIAlertView alloc] 

initWithTitle:@"Final Score" 

message:messageString

delegate:self 

cancelButtonTitle:@"Continue" 

otherButtonTitles:nil];

[alert show];

[alert release];

How to add Paint feature to your IPHONE App...

Add the following code to the .h file that you want to paint on.

UIImageView *drawImage;

int mouseMoved;

BOOL mouseSwiped;

CGPoint lastPoint;

Add the following code to the .m file that you want to paint on.

- (void)viewDidLoad {

    [super viewDidLoad];

// New code for Drawing App. Delete if it does not work.

drawImage = [[UIImageView alloc] initWithImage:nil];

drawImage.frame = self.view.frame;

[self.view addSubview:drawImage];

mouseMoved = 0;

}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {

mouseSwiped = NO;

UITouch *touch = [touches anyObject];

if ([touch tapCount] == 2) {

drawImage.image = nil;

return;

}

lastPoint = [touch locationInView:self.view];

lastPoint.y -= 20;

}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

mouseSwiped = YES;

UITouch *touch = [touches anyObject];

CGPoint currentPoint = [touch locationInView:self.view];

currentPoint.y -= 20; // only for 'kCGLineCapRound'

UIGraphicsBeginImageContext(self.view.frame.size);

[drawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];

CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);

CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0);

CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 1.0);

CGContextBeginPath(UIGraphicsGetCurrentContext());

CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);

CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);

CGContextStrokePath(UIGraphicsGetCurrentContext());

drawImage.image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

lastPoint = currentPoint;

mouseMoved++;

if (mouseMoved == 10) {

mouseMoved = 0;

}

}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {

UITouch *touch = [touches anyObject];

if ([touch tapCount] == 2) {

drawImage.image = nil;

return;

}

if(!mouseSwiped) {

//if color == green

UIGraphicsBeginImageContext(self.view.frame.size);

[drawImage.image drawInRect:CGRectMake(0, 0, drawImage.frame.size.width, drawImage.frame.size.height)]; //originally self.frame.size.width, self.frame.size.height)];

CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound); //kCGLineCapSquare, kCGLineCapButt, kCGLineCapRound

CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 10.0);

CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 0.0, 1.0, 0.0, 1.0);

CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);

CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);

CGContextStrokePath(UIGraphicsGetCurrentContext());

CGContextFlush(UIGraphicsGetCurrentContext());

drawImage.image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

}

}

Can some help me make a clear button to wipe ? E-mail timbojill@gmail.com. I do not read posts.