Warum eine benutzerdefinierte MKMapView Annotation Bild auf Touch verschwinden?

Question

ich meine Karte bin mit Anmerkungen versehen und Einstellung ein Bild ganz gut, aber wenn ich die Anmerkung auf der MapView tippen, geht das Bild von meinem benutzerdefinierten Bild zurück auf den roten Stift. Warum ist das?

- (MKAnnotationView *)mapView:(MKMapView *)newMapView viewForAnnotation:(id )newAnnotation {
    MKPinAnnotationView *annotation = [[MKPinAnnotationView alloc] initWithAnnotation:newAnnotation reuseIdentifier:@"currentloc"];
    if (annotation == nil) {
        annotation = [[MKAnnotationView alloc] initWithAnnotation:newAnnotation reuseIdentifier:@"currentloc"];
    }

    annotation.image = [UIImage imageNamed:@"anno.png"];
    annotation.canShowCallout = YES;
    annotation.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    UIImageView *imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bus_stop_30x30.png"]];
    annotation.leftCalloutAccessoryView = imgView;

    return annotation;
}

Mein Code sieht einen Beispielcode identisch, der dieses Problem nicht produzieren.

Answer 1

Die Beantwortung meiner Frage hier, falls andere das gleiche Problem haben. Beachten Sie, dass ich bin mit „MKPinAnnotationView.“ - es sollte auf „MKAnnotationView“ geändert werden und alles funktioniert

Fixed Code:

- (MKAnnotationView *)mapView:(MKMapView *)newMapView viewForAnnotation:(id )newAnnotation {
    MKAnnotationView *annotation = [[MKAnnotationView alloc] initWithAnnotation:newAnnotation reuseIdentifier:@"currentloc"];

    if (annotation == nil) {
        annotation = [[MKAnnotationView alloc] initWithAnnotation:newAnnotation reuseIdentifier:@"currentloc"];
    }

    annotation.image = [UIImage imageNamed:@"anno.png"];
    annotation.canShowCallout = YES;
    annotation.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    UIImageView *imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bus_stop_30x30.png"]];
    annotation.leftCalloutAccessoryView = imgView;

    return annotation;
}

Answer 2

Ich denke, das ist eine der besten Möglichkeiten:

(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation
{
    NSLog(@"welcome into the map view annotation");
    MyAnnotation* myAnnotation1=annotation;

    // if it's the user location, just return nil.
    if ([annotation isKindOfClass:[MKUserLocation class]])
    return nil;

    if([mapView isEqual:mapMainView]== NO)
    {
        return  nil;
    }
    // try to dequeue an existing pin view first
    //  if ([annotation isKindOfClass:[myAnnotation1 class]]) 
    //  {

    // try to dequeue an existing pin view first
    static NSString* AnnotationIdentifier = @"AnnotationIdentifier";

    MKPinAnnotationView* pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:AnnotationIdentifier];

    if (nil == pinView)
    {
        MKAnnotationView* annotationView = [[[MKAnnotationView alloc] initWithAnnotation:annotation

        reuseIdentifier:AnnotationIdentifier] autorelease];
        // annotationView.canShowCallout = YES;
        // pinView.animatesDrop=YES;
        //pinView.pinColor=MKPinAnnotationColorPurple;

        //image
        UIImage* flagImage = [UIImage imageNamed:@"map_marker_over2.png"];

        CGRect resizeRect;

        resizeRect.size = flagImage.size;
        CGSize maxSize = CGRectInset(self.view.bounds,
        [MapPropertyViewController annotationPadding],
        [MapPropertyViewController annotationPadding]).size;
        maxSize.height -= self.navigationController.navigationBar.frame.size.height + [MapPropertyViewController calloutHeight];
        if (resizeRect.size.width > maxSize.width)
        resizeRect.size = CGSizeMake(maxSize.width, resizeRect.size.height /  resizeRect.size.width * maxSize.width);
        if (resizeRect.size.height > maxSize.height)
        resizeRect.size = CGSizeMake(resizeRect.size.width / resizeRect.size.height *  maxSize.height, maxSize.height);

        resizeRect.origin = (CGPoint){0.0f, 0.0f};
        UIGraphicsBeginImageContext(resizeRect.size);
        [flagImage drawInRect:resizeRect];
        UIImage *resizedImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();

        annotationView.image = resizedImage;
        annotationView.opaque = NO;

        UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        [rightButton setTitle:annotation.title forState:UIControlStateNormal];
        [rightButton addTarget:self
        action:@selector(showDetails:)
        forControlEvents:UIControlEventTouchUpInside];
        rightButton.tag = myAnnotation1.tagAnnotation;
        annotationView.rightCalloutAccessoryView = rightButton;

        profileIconView = [[UIImageView alloc]initWithFrame:CGRectMake(18.5f, 10.0f, 37.0f, 30.0f)];
        annotationView.leftCalloutAccessoryView = profileIconView;
        //image
        img = [UIImage imageWithData: [NSData dataWithContentsOfURL: [NSURL URLWithString:[arrImages objectAtIndex:myAnnotation1.tagAnnotation]]]];
        NSLog(@"Annotation Click %d",[arrImages count]);
        NSLog(@"image  %@",img);
        profileIconView.image=img;

        [profileIconView release];

        [annotationView setEnabled:YES];
        [annotationView setCanShowCallout:YES];
        return annotationView;
    }   
    return pinView;
    //  }
    //  return nil;
}

Answer 3

    Try this if you want to set both Source to Destination pin images different.

    MKPointAnnotation * sourceAnno= [[MKPointAnnotation alloc] init];
    sourceAnno.coordinate=CLLocationCoordinate2DMake(YourSourcelatitude,YourSourcelongitude);
    [sourceAnno setAccessibilityLabel:@“Source”];
    sourceAnno.title = @“You”;
    [mapview addAnnotation: sourceAnno];

    DestinationAnno = [[MKPointAnnotation alloc] init];
    DestinationAnno.coordinate = CLLocationCoordinate2DMake(YourDestinationlatitude,YourDestinationlongitude);
    [DestinationAnno setAccessibilityLabel:@“Destination”];
    DestinationAnno.title =@“Destination”;
    [mapview addAnnotation: DestinationAnno];

   In Delegate Method
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation 
{
    MKPointAnnotation *PointAnno=(MKPointAnnotation *)annotation;
    NSString * kPinAnnotationIdentifier = PointAnno.accessibilityLabel;
    MKAnnotationView *AnnotationView = [[MKAnnotationView alloc]initWithAnnotation:annotation    reuseIdentifier:kPinAnnotationIdentifier];

    if ([kPinAnnotationIdentifier isEqualToString:@"Source"]) 
   {
        AnnotationView.centerOffset = CGPointMake(8, -14);
        AnnotationView.calloutOffset = CGPointMake(-8, 0);
        AnnotationView.image = [UIImage imageNamed:@"pin_blue.png"];
        AnnotationView.canShowCallout = YES;
    }
    else if([kPinAnnotationIdentifier isEqualToString:@"Destination"])
    {
        AnnotationView.centerOffset = CGPointMake(8, -14);
        AnnotationView.calloutOffset = CGPointMake(-8, 0);
        AnnotationView.image = [UIImage imageNamed:@"pin_red.png"];
        AnnotationView.canShowCallout = YES;
    }
    return AnnotationView;
}

Danke