I have been getting crashes of my app that give me the following crash report:
http://crashes.to/s/bed19f6404b
The method stirring up the trouble is this one:
func locationManager(manager: CLLocationManager!, didUpdateLocations locations: [AnyObject]!) {
let MapThread = NSOperationQueue()
MapThread.name = "Map Update"
MapThread.addOperationWithBlock() {
if self.StartandStop.titleLabel?.text == "Start Flight" || self.StartandStop.titleLabel?.text == "Démarrez" {
if let location = locations.first as? CLLocation {
let lastLocation = locations.last as? CLLocation
var altitude = lastLocation?.altitude
dispatch_async(dispatch_get_main_queue(),{
self.mapView.camera = GMSCameraPosition(target: location.coordinate, zoom: 17, bearing: 0, viewingAngle: 0)
});
}
}
if self.StartandStop.titleLabel?.text == "Stop Flight" || self.StartandStop.titleLabel?.text == "Arrêtez" {
if let mylocation = self.mapView.myLocation as CLLocation? { // This is the line indicated in the stack trace
let appDelegate = (UIApplication.sharedApplication().delegate as AppDelegate)
if CMAltimeter.isRelativeAltitudeAvailable() {
println("Check")
appDelegate.maxAltitude = NSString(format: "%.01f", self.maxAlt*3.28084) + " Ft"
}
else {
let relativeAlt = (self.mapView.myLocation as CLLocation).altitude - appDelegate.elevation
appDelegate.altitudes.append(Float(relativeAlt)*3.28084)
self.altitude = Float(relativeAlt)
if appDelegate.maxAltitude == "" {
appDelegate.maxAltitude = "0.0 Ft"
}
}
var lastDistance = self.Distance(self.lastLocation, Coordinate2: (self.mapView.myLocation as CLLocation).coordinate)
self.distance += lastDistance
var lastSpeed = Float((self.mapView.myLocation as CLLocation).speed)
if self.groundspeed > lastSpeed {
appDelegate.groundspeed = NSString(format: "%.01f", Float((self.mapView.myLocation as CLLocation).speed)*1.94384) + " Kts"
}
self.groundspeed = lastSpeed
self.path.addCoordinate(self.mapView.myLocation.coordinate)
dispatch_async(dispatch_get_main_queue(),{
GMSPolyline(path: self.path).map = self.mapView
self.mapView.camera = GMSCameraPosition(target: self.mapView.myLocation.coordinate as CLLocationCoordinate2D, zoom: 17, bearing: 0, viewingAngle: 0)
});
self.lastLocation = (self.mapView.myLocation as CLLocation).coordinate
}
}
}
}
The crash occurs after the app is left in the background for a long period of time with this method running often. Could it be that the NSOperation is giving me a hard time in the background? I was having troubles with it before since I was updating the UI from a background thread. I then added the GCD dispatches to draw the map and this fixed the last issue. Should I be trying to eliminate as much NSOperation from my app as possible?
