IPad Math: The code -- Math Problem subview

Math Problem

I create a small view that has the format of a math problem.   For some reason I couldn't reduce the size of the view from the size of an Ipad View in interface builder, however I put everything in the upper left corner and managed to reduce the size in the code:

This consists of several labels which the code will update.  I named them appropriately so that it was easier to monitor the connections.

 

Of course it looks a little silly in the full window:


And I have everything hooked up the class in interface builder, (along with a custom hidden button to detect clicks)

This shows the connections to the actual class.






The header contains the outlets and  a few actions, right now I have a forward delelaration of the controller class which allows me to update which item is currently selected.  I later intend to change it to a protocol which will allow more flexibility.

@class MathDrillViewController;

@interface MathProblem : UIViewController {

IBOutlet UILabel *first;

IBOutlet UILabel *second;

IBOutlet UILabel *result;

int correctResult;

int currentResult;

MathDrillViewController *controller;

}

@property (nonatomic,retain) UILabel *first;

@property (nonatomic,retain) UILabel *second;

@property (nonatomic,retain) UILabel *result;

@property (nonatomic) int correctResult;

@property (nonatomic) int currentResult;

@property (nonatomic,retain) MathDrillViewController *controller;

- (IBAction) setFocus:(id) sender;

- (void) setChoice:(int) choice;

- (void) clear;

- (id) initWithMax:(int) maxValue;

- (void) checkResult;

@end

The main class contains the ability to change the labels as I randomly generate a subtraction problem.  Note that by adding an outlet for the operator, I could also change the operator if I so choose.

#import "MathProblem.h"

@implementation MathProblem

@synthesize currentResult;

@synthesize correctResult;

@synthesize first;

@synthesize result;

@synthesize second;

@synthesize controller;

/*

 // The designated initializer.  Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {

    if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {

        // Custom initialization

    }

    return self;

}

*/

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.

- (void)viewDidLoad {

    [super viewDidLoad];

self.view.backgroundColor=[UIColor yellowColor];

int ifirst=arc4random()%10+1;

int isecond=arc4random()%ifirst+1;

correctResult=ifirst-isecond;

first.text=[NSString stringWithFormat:@"%d",ifirst];

second.text=[NSString stringWithFormat:@"%d",isecond];

result.text=@"?";

//return self;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {

    // Overriden to allow any orientation.

    return YES;

}

- (void)didReceiveMemoryWarning {

    // Releases the view if it doesn't have a superview.

    [super didReceiveMemoryWarning];

    

    // Release any cached data, images, etc that aren't in use.

}

- (void)viewDidUnload {

    [super viewDidUnload];

    // Release any retained subviews of the main view.

    // e.g. self.myOutlet = nil;

}

- (void)dealloc {

    [super dealloc];

}

- (IBAction) setFocus:(id) sender

{

if (self.controller.currentProblem!=nil)

{

self.controller.currentProblem.view.backgroundColor=[UIColor yellowColor];

}

self.view.backgroundColor=[UIColor blueColor];

self.controller.currentProblem=self;

}

- (void) setChoice:(int) choice

{

result.text=[NSString stringWithFormat:@"%d", choice];

if (choice==correctResult)

self.view.backgroundColor=[UIColor greenColor];

else {

self.view.backgroundColor=[UIColor redColor];

}

}

- (void) clear

{

}

- (id) initWithMax:(int) maxValue

{

return self;

}

- (void) checkResult

{

}

@end