Filling a grid with buttons - objective-c

Question

I am new to objective c and trying the learn the basics of creating a UI. In my UIView class, I have created a grid along with buttons, yet those buttons don't actually exist (as far as I can tell). Ideally, when I click a button, the image is supposed to change, but that doesn't happen. Where should I be looking at to fix?
- (id)initWithFrame:(CGRect)frame {
if( self = [super init]){
tiles_ = [NSMutableArray array];
tileClosed = NO;
}
return self = [super initWithFrame:frame];
}
- (void) initTile : (Tile *) sender
{
int MINE_COUNT = 16;
for(int i = 0; i < MINE_COUNT; i++){
while(1){
int rand = random() % [tiles_ count];
Tile * tile = [tiles_ objectAtIndex:rand];
if(tile != sender && !tile.isMine){
tile.isMine = YES;
break;
}
}
}
tileClosed = YES;
}
- (void)drawRect:(CGRect)rect
{
NSLog( #"drawRect:" );
CGContextRef context = UIGraphicsGetCurrentContext();
// shrink into upper left quadrant
CGRect bounds = [self bounds]; // get view's location and size
CGFloat w = CGRectGetWidth( bounds ); // w = width of view (in points)
CGFloat h = CGRectGetHeight ( bounds ); // h = height of view (in points)
dw = w/16.0f; // dw = width of cell (in points)
dh = h/16.0f; // dh = height of cell (in points)
NSLog( #"view (width,height) = (%g,%g)", w, h );
NSLog( #"cell (width,height) = (%g,%g)", dw, dh );
// draw lines to form a 16x16 cell grid
CGContextBeginPath( context ); // begin collecting drawing operations
for ( int i = 1; i < 16; ++i )
{
// draw horizontal grid line
CGContextMoveToPoint( context, 0, i*dh );
CGContextAddLineToPoint( context, w, i*dh );
}
for ( int i = 1; i < 16; ++i )
{
// draw vertical grid line
CGContextMoveToPoint( context, i*dw, 0 );
CGContextAddLineToPoint( context, i*dw, h );
}
for(int x=1; x<16;x++){
for(int y=1;y<16;y++){
Tile * tile = [[Tile alloc] init];
[tile setFrame:CGRectMake(x * 16.0f, y * 16.0f, 16.0f, 16.0f)];
[tile addTarget:self action:#selector(clickCell:) forControlEvents:UIControlEventTouchUpInside];
[tiles_ addObject: tile]; }
}
[[UIColor grayColor] setStroke]; // use gray as stroke color
CGContextDrawPath( context, kCGPathStroke ); // execute collected drawing ops
}
- (void) clickCell : (Tile *) sender
{
if(! tileClosed) [self initTile: sender];
[sender open];
}

Answer 1

Your initwithFrame: method is broken: the return line should just be return self;.
What you're doing at the moment in effect clobbers the tiles_ array, so it ends up as nil, hence attempting to store tiles in it does nothing (and hence they aren't retained).

Answer 2

Your init method is incorrect and you can change it simply to
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame]
if( self)
{
tiles_ = [NSMutableArray array];
tileClosed = NO;
}
return self;
}
and for the buttons to be appearing you are not adding it to the subview the
[self.view addSubview:tile];
is missing.