UIImageView Draw Line

imageview.userInteractionEnabled = YES;

float brush = 1.0;

float red = 0.0;

float green = 0.0;

float blue = 0.0;

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event

{

    UITouch *touch = [touches anyObject];

   CGPoint  startingpoint = [touch locationInView:drawingImgvw];

}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event

{

    UITouch *touch = [touches anyObject];

    CGPoint pointNext = [touch locationInView:drawingImgvw];

    //UIGraphicsBeginImageContext(drawingImgvw.frame.size);

    UIGraphicsBeginImageContextWithOptions(drawingImgvw.frame.size, false, 0);

    [drawingImgvw.image drawInRect:CGRectMake(0, 0, drawingImgvw.frame.size.width, drawingImgvw.frame.size.height)];

    CGContextSetLineWidth(UIGraphicsGetCurrentContext(),brush);

    CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), red, green, blue, 1.0);

    CGContextSetBlendMode(UIGraphicsGetCurrentContext(),kCGBlendModeNormal);

    CGContextMoveToPoint(UIGraphicsGetCurrentContext(), startingpoint.x, startingpoint.y);

    CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), pointNext.x, pointNext.y);

    CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);

    CGContextStrokePath(UIGraphicsGetCurrentContext());

    drawingImgvw.image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    startingpoint = pointNext;

}