NSObject drawing grid onto NSView

gistfile1.m

// In View Class

- (void)drawRect:(CGRect)dirtyRect
{
    // Draw the background
    NSGraphicsContext* theContext = [NSGraphicsContext currentContext];
    [theContext saveGraphicsState];
    [[NSGraphicsContext currentContext] setPatternPhase:NSMakePoint(0,[self.superview bounds].size.height)];
    [_backgroundColor set];
    NSRectFill([self bounds]);
    [theContext restoreGraphicsState]; 
    
    [self drawPages];
    
    // Draw the grid
    int gridY = grid.offset.y;
    for (int i = 0; i < _numPages; i++) {
        CGRect pageRect = CGRectMake(grid.offset.x, gridY, VBCanvasPageWidth, VBCanvasPageHeight);
//        NSLog(@"fist grid X:%f Y:%f", pageRect.origin.x, pageRect.origin.y);
        [grid drawRect:pageRect inView:self];
        gridY = gridY + VBCanvasPageHeight + VBCanvasPagePadding;
    }
    
    
    
    if (_isDragging) {
        [[[NSColor redColor] colorWithAlphaComponent:0.3f] set];
        CGRect dragRect  = CGRectMake(_downPoint.x, _downPoint.y, _upPoint.x - _downPoint.x, _upPoint.y - _downPoint.y);
        NSRectFillUsingOperation(dragRect, NSCompositeSourceOver);
    }
}


// In Object Class



- (void)drawRect:(CGRect)rect inView:(NSView *)view
{
//    NSLog(@"grid drawRect");
    if (!alwaysShown) {
//        NSLog(@"not drawing grid");
        return;
    }
//    NSLog(@"drawing grid");
    // Figure out a big bezier path that corresponds to the entire grid.  It will consist of the vertical lines and then the horizontal lines.
    NSBezierPath *gridPath = [NSBezierPath bezierPath];
    NSInteger lastVerticalLineNumber = floor(NSWidth(rect) / spacing.doubleValue);
    
    for (NSInteger lineNumber = 0; lineNumber <= lastVerticalLineNumber; lineNumber++) {
        [gridPath moveToPoint:CGPointMake((lineNumber * spacing.doubleValue) + rect.origin.x, NSMinY(rect))];
        [gridPath lineToPoint:CGPointMake((lineNumber * spacing.doubleValue) + rect.origin.x, NSMaxY(rect))];
    }
    
    NSInteger lastHorizontalLineNumber = floor(NSHeight(rect) / spacing.doubleValue);
    for (NSInteger lineNumber = 0; lineNumber <= lastHorizontalLineNumber; lineNumber++) {
        [gridPath moveToPoint:CGPointMake(NSMinX(rect), (lineNumber * spacing.doubleValue) + rect.origin.y)];
        [gridPath lineToPoint:CGPointMake(NSMaxX(rect), (lineNumber * spacing.doubleValue) + rect.origin.y)];
    }
    
    // Draw the grid as one-pixel-wide lines of a specific color
    [color set];
    [gridPath setLineWidth:0.0];
    [gridPath stroke];
}