GoogleMaps SDK for iOS - SWIFT 3: When hiding a marker and then adding the map view back, the cpu gets stuck at 100%

Question

Scenario

• UIViewController sets self.view as GMSMapView in viewDidLload
• A method will create markers and store

Answer 1

This is clustering approach I am using

//method to detect when user scrolls map
@objc(mapView:didChangeCameraPosition:) func mapView(_: GMSMapView, didChange _: GMSCameraPosition) {
    self.counter = self.counter + 1
    self.requestForMap(counter: self.counter)
}

//if user did nothing for 0.2 seconds request data from server
fileprivate func requestForMap(counter: Int) {
    DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) { [weak self] in

        guard let `self` = self else {
            return
        }

        if counter == self.counter {
            self.sessionManager.session.invalidateAndCancel()
            self.requestData()
        }
    }
}

to get pins in area I do this on client

// get coordinates of visible area
extension GMSMapView {

    func boundings() -> [String: Any] {
        let screenBounds = UIScreen.main.bounds
        let topPoint = CGPoint(x: 15, y: 60)
        let bottomPoint = CGPoint(x: screenBounds.width - 15, y: screenBounds.height)
        let shoudBeFull = self.camera.zoom > 15 //if user is zoomed in a lot request all data in area
        let bouding = [
            "top": [
                "lat": self.projection.coordinate(for: topPoint).latitude,
                "lon": self.projection.coordinate(for: topPoint).longitude,
            ],
            "bottom": [
                "lat": self.projection.coordinate(for: bottomPoint).latitude,
                "lon": self.projection.coordinate(for: bottomPoint).longitude,
            ],
            "full": shoudBeFull,
        ] as [String: Any]
        return bouding
    }
}

then this data as JSON is passed to the server and the server gets pins' data for objects, coordinates of which are inside this bounding. We are using node.js, not sure how it works there.

Then I have an array of currently displayed pins like var pins = [GMSMarker], after I get an array of objects from server I go through this array, remove those, which are not in new data and add those, which are new