I am developing a program which identifies a rectangle in an image and draws a path on the border of that identified rectangle. Now I want to reposition that path in case if it is not on the exact position. For an example look at this image
In cases like this i need to drag the corners of the path and reposition it as it fits the rectangle.
To draw the path I used CAShapeLayer and UIBezierPath. Here is the code I used to draw the path.
// imgView is the UIImageView which contains the image with the rectangle
let line: CAShapeLayer = CAShapeLayer();
line.frame = imgView.bounds;
let linePath: UIBezierPath = UIBezierPath();
linePath.moveToPoint(CGPointMake(x1, y1);
linePath.addLineToPoint(CGPointMake(x2, y2);
linePath.addLineToPoint(CGPointMake(x3, y3);
linePath.addLineToPoint(CGPointMake(x4, y4);
linePath.addLineToPoint(CGPointMake(x1, y1);
linePath.closePath();
line.lineWidth = 5.0;
line.path = linePath.CGPath;
line.fillColor = UIColor.clearColor().CGColor;
line.strokeColor = UIColor.blueColor().CGColor;
imgView.layer.addSublayer(line);
The thing is I tried to add a gesture to UIBezierPath. But there is nothing like that as I noticed. Couldn't find anything regarding this. So can someone please let me know a way to get my work done. Any help would be highly appreciated.