setRegion: MKMapView becomes unresponsive

Question

I have an MKMapView with 2 buttons on it: zoom in and zoom out.

I noticed that when I use them, I can't pinch the map to zoom anymore until the animation is done.

I have my buttons hooked up to setRegion on a smaller or larger span than it is now.

I tried adding a UIPinchGestureRecognizer to my map to stop the animation and allow the pinch to work. Here is how I did that:

I added a Bool variable that keeps whether the map is currently animating from a tap on the buttons.

func pinchRecognized() {
    if animating {
        var region = self.region
        region.span.latitudeDelta += 0.001
        setRegion(region, animated: false)
        animating = false
    }
}

I override setRegion like this:

override func setRegion(_ region: MKCoordinateRegion, animated: Bool) {
    if (animated)
    {
        animating = true
        super.setRegion(region, animated: animated)

        perform(#selector(noLongerAnimating), with: nil, afterDelay: 1)
    }
    else
    {
        super.setRegion(region, animated: animated)
    }
}

func noLongerAnimating() {
    animating = false
}

These work in stopping the animation, but the pinch is not recognised by the map itself to zoom, even though I do this:

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    return true
}

I guess the setRegion in pinchRecognized breaks it, but I don't know how else to stop the animation.

As requested, the button code, both buttons use this method, zoom in uses 0.5, zoom out uses 2:

func zoomTo(delta: Double, animated: Bool) {
    var region = self.region
    var span = region.span

    span.latitudeDelta *= delta
    span.longitudeDelta *= delta
    if (span.latitudeDelta < 180 && span.longitudeDelta < 180)
    {
        region.span = span
        setRegion(region, animated: animated)
    }
}

Edit: I tried setting the setRegion (the one that stops the animation) in gestureRecognizer:shouldRecognizeSimultaneouslyWith:, but there it doesn't get called while animating the map.

Edit: After trying what @robinb suggested, I saw that my annotations update quicker than my map itself, suggesting that the region gets set, it just waits for something to visually update the map.

Answer 1

Gesture recognizers don't fire on views that are being animated. Hold the views in a variable/array at the ViewController. Use the code in this post to execute the animations: https://stackoverflow.com/a/13814789/3970581

Here is the testproject: https://github.com/DuncanMC/iOS-CAAnimation-group-demo