Map Zooms Back Out after releasing on Zoom-in - ios

Question

I have MapView that shows two points on a map with a route. When I zoom into the map, after I release, the map zooms back out.
I have zoomEnabled and scrollEnabled all set to yes in Code and on the InterfaceBuilder
#interface MapViewController () <UIApplicationDelegate, MKMapViewDelegate,CLLocationManagerDelegate> {
CLLocationManager * locationManager;
CLPlacemark * pmDesination;
CLLocation * currentLocation;
MyAnnotation * destinationAnn;
MKPolyline *_routeOverlay;
MKRoute *_currentRoute;
}
#end
#implementation MapViewController
const static int TYPE_STATUS_PICKUP = 0;
const static int TYPE_STATUS_DROPOFF = 1;
- (void) viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[self stopLocationServices];
}
- (void) viewDidLoad {
[super viewDidLoad];
self.mapView.delegate = self;
self.mapView.zoomEnabled = YES;
self.mapView.scrollEnabled = YES;
[self startLocationServices];
//Show points on map
[self addressSearch:self.pickupLocation type:TYPE_STATUS_PICKUP];
[self addressSearch:self.dropoffLocation type:TYPE_STATUS_DROPOFF];
}
- (void) mapViewDidFinishLoadingMap:(MKMapView *)mapView {
[self showRoute];
NSMutableArray * pins = [[NSMutableArray alloc] init];
if (destinationAnn != nil) {
[pins addObject:destinationAnn];
}
if ([self getCurrentLocationAnnotation] != nil) {
[pins addObject:[self getCurrentLocationAnnotation]];
}
if (pins.count > 0) {
[_mapView showAnnotations:pins animated:YES];
}
}
#pragma mapping methods
- (void) addressSearch:(NSMutableDictionary *)pinLocation type:(int)type {
CLGeocoder *geocoder = [[CLGeocoder alloc] init];
[geocoder geocodeAddressString:pinLocation[#"address"] completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
if (error) {
//ERROR LOOKING UP ADDRESS
} else {
CLPlacemark * pm = [placemarks lastObject];
location.latitude = pm.location.coordinate.latitude;
location.longitude = pm.location.coordinate.longitude;
[ann setCoordinate:location];
ann.title = [pinLocation objectForKey:#"title"];
ann.subtitle = [pinLocation objectForKey:#"address"];
if (type == _toLocation) {
destinationAnn = ann;
}
[self.mapView addAnnotation:ann];
}
}];
}
#pragma mark - SHOW ROUTE
- (void) showRoute {
MKDirectionsRequest *directionsRequest = [MKDirectionsRequest new];
MKMapItem *source = [MKMapItem mapItemForCurrentLocation];
// Make the destination
CLLocationCoordinate2D destinationCoords = CLLocationCoordinate2DMake(destinationAnn.coordinate.latitude, destinationAnn.coordinate.longitude);
MKPlacemark *destinationPlacemark = [[MKPlacemark alloc] initWithCoordinate:destinationCoords addressDictionary:nil];
MKMapItem *destination = [[MKMapItem alloc] initWithPlacemark:destinationPlacemark];
// Set the source and destination on the request
[directionsRequest setSource:source];
[directionsRequest setDestination:destination];
MKDirections *directions = [[MKDirections alloc] initWithRequest:directionsRequest];
[directions calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {
if (error) {
NSLog(#"There was an error getting your directions: %#", error.localizedDescription);
return;
}
_currentRoute = [response.routes firstObject];
[self plotRouteOnMap:_currentRoute];
}];
}
- (void)plotRouteOnMap:(MKRoute *)route
{
if(_routeOverlay) {
[self.mapView removeOverlay:_routeOverlay];
}
// Update the ivar
_routeOverlay = route.polyline;
// Add it to the map
[self.mapView addOverlay:_routeOverlay];
}
- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay
{
MKPolylineRenderer *renderer = [[MKPolylineRenderer alloc] initWithPolyline:overlay];
renderer.strokeColor = _toLocation ? [UIColor orangeColor] : [UIColor greenColor];
renderer.lineWidth = 4.0;
return renderer;
}
// DELGATE THAT RUNS TO SHOW CURRENT USER LOCATION
- (void) locationManager:(CLLocationManager *)manager didFailWithError:(nonnull NSError *)error {
NSLog(#"Location Services Error: %#", [error description]);
[[LoggingManager sharedReporting] addReportToLog:[NSString stringWithFormat:#"Mapping: locationManager:didFailWithError: %#",[error description] ]];
}
- (void) locationManager:(CLLocationManager *)manager didUpdateLocations: (NSArray *)locations {
currentLocation = [locations lastObject];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
currentLocation = newLocation;
}
#pragma mark - GET TO AND CURRENT POINTS
- (NSString*) getDestination {
NSDictionary * desDict = _toLocation ? self.dropoffLocation : self.pickupLocation;
NSString * address = #"";
if ([[desDict objectForKey:#"lat"] length] > 0 && [[desDict objectForKey:#"lon"] length] > 0) {
address = [NSString stringWithFormat:#"%#,%#",[desDict objectForKey:#"lat"], [desDict objectForKey:#"lon"]];
} else if ([desDict[#"address"] length] > 0 && [desDict[#"address"] rangeOfString:#"{"].location == NSNotFound) {
address = [desDict objectForKey:#"address"];
} else {
address = #"NULL";
}
return address;
}
- (NSString*) getCurrentLocation {
return [NSString stringWithFormat:#"%f,%f", currentLocation.coordinate.latitude, currentLocation.coordinate.longitude];
}
- (MyAnnotation*) getCurrentLocationAnnotation {
MyAnnotation * ann = [[MyAnnotation alloc] init];
CLLocationCoordinate2D location = CLLocationCoordinate2DMake(currentLocation.coordinate.latitude, currentLocation.coordinate.longitude);
[ann setCoordinate:location];
ann.title = #"My Current Location";
ann.subtitle = #"";
return ann;
}
#end

Answer 1

The problem is that you are setting the map's visible region by calling showAnnotations. This conflicts with the user zooming.