Create dashed line in SpriteKit (OS X) - objective-c

Question

I'm trying to create a dashed line using an SKShapeNode in SpriteKit for Mac OS X in Objective C, not iOS and not in Swift. I've taken a look at many SO articles for this and tried to piece it together. The main issue that a lot of them are in Swift. Here's what I've come up with so far, but it's not showing anything and I'm not sure why:
-(void) drawBarLineDivisions {
...
NSBezierPath *path = [NSBezierPath bezierPath];
CGPoint startPoint = CGPointMake(0, 250);
CGPoint endPoint = CGPointMake(450, 250);
[path moveToPoint:startPoint];
[path lineToPoint:endPoint];
CGFloat pattern[2] = {10.0, 10.0};
CGPathRef dashedLine = CGPathCreateCopyByDashingPath ([self CGPathFromPath:path], nil, 0, pattern, 2);
SKShapeNode *line = [SKShapeNode shapeNodeWithPath:dashedLine];
CGPathRelease(dashedLine);
int x = i/(double)measureDivisions*[self getGridArea]/[self getMeasuresDisplayed];
[line setPosition:CGPointMake(x, 0)];
[line setFillColor:fillColor];
[line setStrokeColor:[NSColor clearColor]];
[self addChild:line];
}
//helper method for converting NSBezierPath into CGPath
- (CGMutablePathRef)CGPathFromPath:(NSBezierPath *)path
{
CGMutablePathRef cgPath = CGPathCreateMutable();
NSInteger n = [path elementCount];
for (NSInteger i = 0; i < n; i++) {
NSPoint ps[3];
switch ([path elementAtIndex:i associatedPoints:ps]) {
case NSMoveToBezierPathElement: {
CGPathMoveToPoint(cgPath, NULL, ps[0].x, ps[0].y);
break;
}
case NSLineToBezierPathElement: {
CGPathAddLineToPoint(cgPath, NULL, ps[0].x, ps[0].y);
break;
}
case NSCurveToBezierPathElement: {
CGPathAddCurveToPoint(cgPath, NULL, ps[0].x, ps[0].y, ps[1].x, ps[1].y, ps[2].x, ps[2].y);
break;
}
case NSClosePathBezierPathElement: {
CGPathCloseSubpath(cgPath);
break;
}
default: NSAssert(0, #"Invalid NSBezierPathElement");
}
}
return cgPath;
}