gistfile1.m

NSInteger rows = floorf(self.frame.size.height / (kPostSquareSize + (kPostSquarePadding * 2)));
        
    NSInteger i = 0;
    
    for (CALayer *layer in parentLayer.sublayers) {
        
        CGFloat x = ((i - (i%rows))/rows) * (kPostSquareSize + kPostSquarePadding);
        CGFloat y = (i % rows) * (kPostSquareSize + kPostSquarePadding);
        
        CGRect newFrame = CGRectMake(x, y, kPostSquareSize, kPostSquareSize);
        
        layer.frame = newFrame;
        
        i ++;
    }