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[ng93]

i haven't had time to test it but this should work:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
	UITouch *touch = [touches anyObject];
	CGPoint touchPosition = [touch locationInView:self.view];
	CGFloat cellHeight = 20;
	CGFloat cellWidth = 20;
	int amountCellsWidth = 50;
	int amountCellsHeight = 50;
	for (int x=0; x<amountCellsWidth; x++) {
		for (int y=0; y<amountCellsHeight; y++) {
			if (touchPosition.y > y*cellHeight && touchPosition.y < (y+1)*cellHeight && touchPosition.x > x*cellWidth && touchPosition.x < (x+1)*cellWidth) {
				[cell[x][y] setImage:yourImage];
			}
		}
	}
}