How can I make the line turn?

I drew the line that turn like clock.

This is the line's moving of my ideal

but my code moves like this

How can I make a line like the second picture's line?

Here is my code

LineLayer.m

    - (void)drawInContext:(CGContextRef)ctx
    {
        CGMutablePathRef path = CGPathCreateMutable();
        CGPoint points[] = {
            CGPointMake(160, 220),
            CGPointMake(160, 120),
        };

        int numPoints = sizeof(points)/sizeof(points[0]);
        CGPathAddLines(path, NULL, points, numPoints);

        CGContextAddPath(ctx, path);
        CGPathRelease(path);

        UIColor *lineColor = [UIColor colorWithWhite:1.0 alpha:1.0];
        CGContextSetStrokeColorWithColor(ctx, lineColor.CGColor);
        CGContextSetLineWidth(ctx, 5.0);
        CGContextDrawPath(ctx, kCGPathStroke);    
}

ViewController.h

- (void)setup
{    
    LineLayer *linelayer = [LineLayer layer];
    linelayer.frame = CGRectInset(self.view.bounds,0.0,0.0);
    linelayer.anchorPoint = CGPointMake(0.5, 0.5);

    [self.view.layer addSublayer:linelayer];
    [linelayer setNeedsDisplay];

 CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
    animation.toValue = [NSNumber numberWithFloat:M_PI / 2.0];
    animation.duration = 0.5;          
    animation.repeatCount = MAXFLOAT;   
    animation.cumulative = YES;         
    [linelayer addAnimation:animation forKey:@"ImageViewRotation"];
}