Rounded Corner For CGRectAddArc - ios

Question

The below code draws the rounded corner at the at the end of the path(green color). But, not at the start. What could be done so that I have the rounded corner at the start too(where Red colour starts). Its not perfect round at the start.
-(void)drawRect:(CGRect)rect{
CGContextRef context = UIGraphicsGetCurrentContext();
CGFloat arcStartAngle = M_PI;
CGFloat arcEndAngle = 2 * M_PI;
CGPoint startPoint = CGPointMake(0,CGRectGetMidY(rect));
CGPoint endPoint = CGPointMake(CGRectGetMaxX(rect),CGRectGetMidY(rect));
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGFloat colors[] =
{
1.0, 0.0, 0.0, 1.0,
0.0, 1.0, 0.0, 1.0
};
CGGradientRef gradient = CGGradientCreateWithColorComponents(colorSpace, colors, NULL, 2);
CGColorSpaceRelease(colorSpace);
CGMutablePathRef arc = CGPathCreateMutable();
CGPathMoveToPoint(arc, NULL, startPoint.x, startPoint.y);
CGPoint arcCenter = CGPointMake(CGRectGetMidX(rect), CGRectGetMidY(rect));
CGFloat radius = CGRectGetMidX(rect);
CGPathAddArc(arc, NULL, arcCenter.x, arcCenter.y, radius-5.0,
arcStartAngle, arcEndAngle, NO);
CGPathRef strokedArc = CGPathCreateCopyByStrokingPath(arc, NULL, 10.0f,
kCGLineCapRound, kCGLineJoinRound, 10.0f);
CGContextSaveGState(context);
CGContextAddPath(context, strokedArc);
CGContextClip(context);
CGContextDrawLinearGradient(context, gradient, startPoint, endPoint, 0);
CGContextDrawPath(context, kCGPathFillStroke);
CGGradientRelease(gradient);
CGContextRestoreGState(context);
}

Answer 1

I had been working on your question and this is what I have found.
Your problem is related to your begin path point you have
CGPathMoveToPoint(arc, NULL, startPoint.x, startPoint.y);
but for your example you need start on startPoint.x + 5 because you are using 10 of width of your path so you need modify this line and use this instead
CGPathMoveToPoint(arc, NULL, startPoint.x + 5, startPoint.y);
and now should work, This is the result
I hope this helps you.