UISwipeGestureRecognizer working weird

Question

In my UiView I have a subView called 'container' which should perform a rotation animation either if the user swipe up or down. Basically it's like a wheel where if the user swipe down the wheel swipe down of a certain degree while swiping up perform the opposite action.

Here's my viewDidLoad code:

override func viewDidLoad() {
    super.viewDidLoad()

    //Swipe Gesture Recognizers Setup
    let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(self.swipeUp(_:)))
    swipeUp.direction = .up
    swipeUp.delegate = self as? UIGestureRecognizerDelegate

    let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(self.swipeDown(_:)))
    swipeDown.direction = .down
    swipeDown.delegate = self as? UIGestureRecognizerDelegate

    view.addGestureRecognizer(swipeDown)
    view.addGestureRecognizer(swipeUp)
}

and these are the 2 functions for swipe up or down:

func swipeUp(_ sender: UISwipeGestureRecognizer) {
    print("Swiped Up")
    UIView.animate(withDuration: 1) {
        self.borderContainer.transform = CGAffineTransform(rotationAngle: 0)
    }
}

func swipeDown(_ sender: UISwipeGestureRecognizer) {
    print("Swiped Down")
    UIView.animate(withDuration: 1) {
        self.borderContainer.transform = CGAffineTransform(rotationAngle: 45)
    }}

Everything works great, consolle is printing the swipe direction everytime the action is performed BUT (yeah there's a BUT!) it calls the related function only ONCE in each direction. Meaning that if I swipe Down, then I can only Swipe up...

I want it to be able to keep swiping down or up anytime the user wants...

What am I doing wrong? I read about the UIGestureRecogniser rotating together with the view therefore it's not reachable anymore but I applied the solution to apply the Gesture Recogniser to the superView and not to the View I'm animating... Why does the Swipe Gesture Recognizer only work once?

Any help is highly appreciated!

Answer 1

Take a close look at your swipe down function. You set the same value every time you swipe down.

You need to add 45 degrees to the current angle if you want to change it every time. Otherwise it will continue to be in the same position as before.

Try to use borderContainer.transform.rotated(by: 45).