Creé un UIGestureRecognizer para rotar una vista con solo un dedo.

La vista gira al principio pero tan pronto como alcanza un cierto grado, la rotación gira en la otra dirección.

¿Me pueden ayudar con mi código?

UIViewcontroller <- Todo está bien aquí

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.

    let wheel = TestWheelView()
    wheel.frame = CGRect.init(x: self.view.center.x - 120, y: self.view.center.y - 120, width: 240, height: 240)
    self.view.addSubview(wheel)
    wheel.addGestureRecognizer(TestRotateGestureRecognizer())
}

UIGestureRecognizer <- El problema está aquí

import UIKit

class TestRotateGestureRecognizer: UIGestureRecognizer {
    var previousPoint = CGPoint()
    var currentPoint = CGPoint()
    var startAngle = CGFloat()
    var currentAngle = CGFloat()
    var currentRotation = CGFloat()
    var totalRotation = CGFloat()

    func angleForPoint(_ point:CGPoint) -> CGFloat{
        var angle = atan2(point.y - (self.view?.center.y)!, point.x - (self.view?.center.x)!)

        return angle
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent) {
        super.touchesBegan(touches, with: event)
    }

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent) {
        super.touchesMoved(touches, with: event)

        if let firstTouch = touches.first {
            previousPoint = firstTouch.previousLocation(in: self.view)
            currentPoint = firstTouch.location(in: self.view)
            startAngle = angleForPoint(previousPoint)
            currentAngle = angleForPoint(currentPoint)

            currentRotation = currentAngle - startAngle
            totalRotation += currentRotation

            self.view?.transform = CGAffineTransform(rotationAngle: totalRotation)
        }
    }

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent) {
        super.touchesEnded(touches, with: event)
    }
}