Beginning iOS Programming For Dummies by Rajiv Ramnath & Cheyney Loffing

Author:Rajiv Ramnath & Cheyney Loffing
Language: eng
Format: epub
ISBN: 9781118799314
Published: 2014-03-24T22:21:29+00:00

Figure 7-7 shows the views that the Game Session view controller manages.

Figure 7-7: View managed by the Game Session view controller.

The board is a custom view that's implemented by the TTTBoard class, which is a subclass of UIView. Here is the interface file for the TTTBoard class:

//

//

...

#import <UIKit/UIKit.h>

#import "TTTGameSessionViewController.h"

@class TTTGameGrid;

@interface TTTBoard : UIView{

@private BOOL enabled;

@private TTTGameSessionViewController *gameSession;

@private TTTGameGrid *grid;

@private float width; // width of one block

@private float height; // will be same as width;

}

- (void)drawRect:(CGRect)rect;

- (void) setGrid: (TTTGameGrid *) aGrid;

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

- (void) setGameSession: (TTTGameSessionViewController *) aGameSession;

- (float) getWidth;

- (float) getHeight;

- (void) invalidateBlock: (int) x :(int) y;

- (BOOL) isInputEnabled;

- (void) disableInput;

- (void) enableInput;

@end

Next, I explain what the important methods in this class do, and how they work:

TTTBoard is specialized from UIView in that it overrides the drawRect method from UIView and implements its own method. This drawRect method is the one that draws the Tic-Tac-Toe grid along with all the played symbols when the board changes (that is, after each move). The drawRect method is automatically called by the iOS runtime system or, more specifically, by the view manager within iOS when the view needs to be rendered.

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