iPhone CGContext: drawing two lines with two different colors

Question

I am having some troubles using the CGContext with an iPhone app. I am trying to draw several lines with different colors, but all the lines always end up having the color which

Answer 1

If you are interested in the way it looks in a loop:

- (void)drawRect:(CGRect)rect {        
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetLineWidth(context, 2.0);

    CGPoint startingPoint = [[pointsArray objectAtIndex:0] CGPointValue];
    CGContextMoveToPoint(context, startingPoint.x, startingPoint.y); //start at this point

    for (int i = 1; i < [pointsArray count]; i++) {
        CGContextBeginPath(context);
        //start at the previous point
        CGContextMoveToPoint(context, 
               [[pointsArray objectAtIndex:i-1] CGPointValue].x, 
               [[pointsArray objectAtIndex:i-1] CGPointValue].y);

        CGPoint point = [[pointsArray objectAtIndex:i] CGPointValue];
        if (point.y < 50) { // if y is less then 50 use red color
            CGContextSetStrokeColorWithColor(context, [UIColor redColor].CGColor);
        } else { // else use blue color
            CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);

        }
        CGContextAddLineToPoint(context, point.x, point.y); //draw to this point
        CGContextStrokePath(context);
    }
}