IOS resize or reposition line on touching end points (Objective c)

I am trying to resize the line, by touching the red circle points. Let's say, I want to move this line above lips in the image below, How can i achieve this. The line is not moving from the position. I have just started up with this thing and can't find much relevant resources to accomplish this. Trying the best...Please guide me in the right direction. Below is my code and reference image.

Objective c code:

- (void)viewDidLoad
{
    [super viewDidLoad];
    UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(100, 100) radius:10 startAngle:0 endAngle:6.2831853 clockwise:TRUE];

    //Add second circle
    [path moveToPoint:CGPointMake(100.0, 100.0)];
    [path addLineToPoint:CGPointMake(200, 200)];
    [path moveToPoint:CGPointMake(200, 200)];

    [path addArcWithCenter:CGPointMake(200, 200) radius:10 startAngle:0 endAngle:6.2831853 clockwise:TRUE];


    [path closePath];
    [[UIColor redColor] setStroke];
    [[UIColor redColor] setFill];
    [path stroke];
    [path fill];

    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    shapeLayer.path = [path CGPath];
    shapeLayer.strokeColor = [[UIColor blueColor] CGColor];
    shapeLayer.lineWidth = 2.0;
    shapeLayer.fillColor = [[UIColor redColor] CGColor];

    [self.view.layer addSublayer:shapeLayer];

}

I will add multiple lines like this and my ultimate aim is to move individual line at any position in the image and get measurement of that area using line size.

EDIT: The scenario is, at any given time there will be some flexible lines available on the screen. Lets's say by clicking button, one more new line will be added to screen. The user can just drag any end point to resize the line in any direction. I can't get this thing working correctly.. no luck.

Here is my gist file link, http://ift.tt/1dp9Hm0 It basically adds a UIView to create a line on image. The code in gist allows me to resize the line height by moving touch points up and down but doesn't allow me to rotate the angle of line and adding text in the centre. THANKS

Thanks!