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how to get a pie progress bar
- (void)drawRect:(CGRect)rect
{
    CGFloat circleRadius = (self.bounds.size.width / 2) - (self.strokeWidth * 2);
    CGPoint circleCenter = CGPointMake(CGRectGetMidX(rect), CGRectGetMidY(rect));
    CGRect circleRect = CGRectMake(circleCenter.x - circleRadius, circleCenter.y - circleRadius, 2 * circleRadius, 2 * circleRadius);

    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSaveGState(context);

    // Draw stroked circle to delineate circle shape.

    CGContextSetStrokeColorWithColor(context, self.fillColor.CGColor);
    CGContextSetLineWidth(context, self.strokeWidth);
    CGContextAddEllipseInRect(context, circleRect);
    CGContextStrokePath(context);

    // Draw filled wedge (clockwise from 12 o'clock) to indicate progress

    self.progress = MIN(MAX(0.0, self.progress), 1.0);

    CGFloat startAngle = -M_PI_2;
    CGFloat endAngle = startAngle + (progress * 2 * M_PI);

    CGContextSetFillColorWithColor(context, self.fillColor.CGColor);
    CGContextMoveToPoint(context, circleCenter.x, circleCenter.x);
    CGContextAddLineToPoint(context, CGRectGetMidX(circleRect), CGRectGetMinY(circleRect));
    CGContextAddArc(context, circleCenter.x, circleCenter.y, circleRadius, startAngle, endAngle, NO);
    CGContextClosePath(context);
    CGContextFillPath(context);

    CGContextRestoreGState(context);
}