私のアプリ内には、MKMapViewの画面があります。
このマップは、一連の場所のピンを示しています（場所はアプリ内で定義されたモデルです）。
シミュレーターで実行している場合、これは正常に機能します。ただし、これをデバイスで実行すると、マップがパンされるたびにピンが消えて再表示されるように見えます。わずかなタッチや動きでも、マップにピンが表示されたり非表示になったりする可能性があります。
マップは特に忙しくはありません。ピンを1つ表示しても、表示および非表示になります。
なぜこれが起こっているのか誰かが知っていますか？以下にコードを貼り付けました...これはRubymotionアプリなので、コードはRubyにあります。
- アップデート -
このRubyコードに相当するObjectiveCを以下に追加しました。いくつかのタイプミスや慣用的なエラーがある場合は、お詫びします。OCを作成してからしばらく経ちました。
-更新2-
ロガーを見るとmapView:viewForAnnotation、マップピンが消えたり再表示されたりするたびに呼び出されていることがわかります。
また、注釈のオブジェクトIDが同じであることがわかるたびmapView:regionDidChangeAnimatedに、削除されているとは思いません（削除されるべきではありません）。
# ====================
# = MKMapKitDelegate =
# ====================
# Don't react if the user has moved less than three meters
USER_MOVE_THRESHOLD = 3
# The user location has changed
def mapView(mapView, didUpdateUserLocation: newLocation)
NSLog("mapView:didUpdateUserLocation")
return unless userLocation
coord = newLocation.coordinate
newLocationAsCL = CLLocation.alloc.initWithCoordinate(coord, altitude: 1, horizontalAccuracy:1, verticalAccuracy: -1, timestamp: nil)
meters = newLocationAsCL.distanceFromLocation(@lastUserCLLocation)
# If user has moved less than 3m, return
if meters > 0 and meters < USER_MOVE_THRESHOLD
log "Distance was less than #{USER_MOVE_THRESHOLD} meters (#{meters}) - returning ***"
return
end
# If the coord is the same as the previous user location
if userLocation.coordinate.latitude == coord.latitude && userLocation.coordinate.longitude == coord.longitude
log "User hasn't moved - returning ***"
else
log 'User has moved'
end
log "Did update user location: #{coord.latitude},#{coord.longitude}"
if coord.latitude.to_f == 0.0 and coord.longitude.to_f == 0.0
log 'Invalid coordinate received - returning ***'
else
fetchLocationsFromAPI
end
end
def mapView(mapView, regionDidChangeAnimated: animated)
NSLog("mapView:regionDidChangeAnimated:#{animated}")
# do nothing here yet...
end
# create map pins...
def mapView(mapView, viewForAnnotation: annotation)
log "mapView:viewForAnnotation: #{annotation.inspect}"
if annotation.is_a?(Location)
# If there's already an annotation we can use, use it! Otherwise create a new one
annotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(annotation.class.to_s) || begin
annotationView = MKPinAnnotationView.alloc.initWithAnnotation(annotation, reuseIdentifier: annotation.class.to_s)
annotationView.enabled = true
annotationView.canShowCallout = true
annotationView.animatesDrop = false
annotationView.pinColor = MKPinAnnotationColorRed
rightButton = UIButton.buttonWithType(UIButtonTypeDetailDisclosure)
rightButton.addTarget(self, action: 'showLocationScreen:', forControlEvents: UIControlEventTouchUpInside)
annotationView.rightCalloutAccessoryView = rightButton
annotationView
end
annotationView.annotation = annotation
annotationView.rightCalloutAccessoryView.tag = @mapLocations.index(annotation)
return annotationView
end
end
def mapView(mapViewm, didAddAnnotationViews: views)
NSLog("mapView:didAddAnnotationViews - #{views}")
# do nothing here yet...
end
Objective C
#define kUserMoveThreshold 1
-(void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)newLocation
{
NSLog(@"mapView:didUpdateUserLocation")
if (!userLocation) {
return;
}
CLLocationCoordinate2D coord = newLocation.coordinate;
CLLocation newLocationAsCL = [[CLLocation alloc] initWithCoordinate: coord altitude: 1 horizontalAccuracy: 1 verticalAccuracy: -1 timestamp: NULL];
CLLocationDistance meters = [newLocationAsCL distanceFromLocation: lastUserCLLocation];
// If user has moved less than 3m, return
if (meters > 0 && meters < kUserMoveThreshold){
NSLog(@"Distance was less than %d meters (%d) - returning ***", kUserMoveThreshold, meters);
return;
}
// If the coord is the same as the previous user location
if (userLocation.coordinate.latitude == coord.latitude && userLocation.coordinate.longitude == coord.longitude){
NSLog(@"User hasn't moved - returning ***");
return;
} else {
NSLog(@"User has moved");
}
NSLog(@"Did update user location: %f,%f", coord.latitude, coord.longitude);
if (coord.latitude == 0.0 && coord.longitude == 0.0){
NSLog(@"Invalid coordinate received - returning ***");
} else {
[self fetchLocationsFromAPI];
}
}
-(void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{
NSLog(@"mapView:regionDidChangeAnimated: %s", animated ? @"TRUE" : @"FALSE");
}
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id < MKAnnotation >)annotation
{
NSLog(@"mapView:viewForAnnotation %s", annotation.description);
if ([annotation isKindOfClass: [Location class]]){
// If there's already an annotation we can use, use it! Otherwise create a new one
MKAnnotationView *annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier: [annotation className]];
if (!annotationView){
annotationView = [[MKPinAnnotationView alloc] initWithAnnotation: annotation reuseIdentifier: [annotation className]];
[annotationView setEnabled: YES];
[annotationView setCanShowCallout: YES];
[annotationView setAnimatesDrop: NO];
[annotationView setPinColor: MKPinAnnotationColorRed];
UIButton *rightButton = [UIButton buttonWithType: UIButtonTypeDetailDisclosure];
[rightButton addTarget: self action: @selector(showLocationScreen:) forControlEvents: UIControlEventTouchUpInside];
[annotationView setRightCalloutAccessoryView: rightButton];
}
[annotationView annotation: annotation];
[[annotationView rightCalloutAccessoryView] setTag: [mapLocations indexOfObject: annotation]];
return annotationView
}
}
-(void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views
{
NSLog(@"mapView:didAddAnnotationViews %@", views)
}