Creating a Path in multiple steps - iphone

Question

I am trying to create a path, then immediately retrieve it and modify it. The problem is that the path gets created and displayed correctly but then I am unable to retrieve it and modify it further.
UPDATE: The problem is that when I call CGContextClosePath in the second function the compiler returns this error:
: CGContextClosePath: no current point.
It basically does not "recognise" the old path and therefore it cannot close it. Any advice would be highly appreciated! Thanks!
Here is my code:
//Defined at the very beginning outside the functions
CGMutablePathRef _path;
//First function
UITouch *touch = [touches anyObject];
CGPoint currentPoint = [touch locationInView:self];
UIGraphicsBeginImageContext(self.frame.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[drawImage.image drawInRect:CGRectMake(0, 0, drawImage.frame.size.width, drawImage.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), BrushSize);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 1.0, 1.0, 1.0);
_path = CGPathCreateMutable();
CGContextAddPath (context, _path);
CGContextMoveToPoint(context, lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(context, currentPoint.x, currentPoint.y);
CGContextStrokePath(context);
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//Second function
UIGraphicsBeginImageContext(self.frame.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[drawImage.image drawInRect:CGRectMake(0, 0, drawImage.frame.size.width, drawImage.frame.size.height)];
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound); //kCGLineCapSquare, kCGLineCapButt, kCGLineCapRound
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), BrushSize); //1.0); // Brush size
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 1.0);
CGContextSetRGBFillColor(context, 1.0, 0.4, 1.0, 1.0);
CGPathRef pathFill = CGPathCreateCopy (_path);
CGContextAddPath (context, pathFill);
CGContextClosePath(context);
CGContextFillPath(context);
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Answer 1

Try adding the path to the context again before you stroke it.
CGContextAddPath (UIGraphicsGetCurrentContext(), _path);
CGContextStrokePath(UIGraphicsGetCurrentContext());
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
It that doesn't work, try creating a copy of the original path and add a new line to that instead of trying to use the original. Use:
CGPathCreateCopy