自定义标记图标 iOS 质量差

Question

I'm trying to add an image to the marker. How to achieve the best quality? As you can see the Google Map yourself increases it twice.

Answer 1

do you add an asset to you project or just one image?

So, you need to add asset of images (named like - bigMarker.png, bigMarker@2x.png, bigMarker@3x.png) to your project asset, like on screenshots. That works fine on iOS 9.

And that my sample of code in viewDidLoad:

// Add custom position in Kansas
CustomAnnotation *annotation = [CustomAnnotation new];
annotation.title = @"Elevation Burger";
annotation.subtitle = @"The best buns...";
annotation.coordinate = CLLocationCoordinate2DMake(39.0119020f,-98.4842460f);
[self.myMap addAnnotation:annotation];

And this one in delegate:

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {

    MKAnnotationView *annotationView = nil;
    if (annotation != mapView.userLocation) {
        annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation
                                                      reuseIdentifier:nil];
        annotationView.canShowCallout = YES;
        annotationView.image = [UIImage imageNamed:@"bigMarker"];
        annotationView.leftCalloutAccessoryView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"burgerBitmap"]];

        UIButton *accessoryButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        UIImage *disclosureButtonImage = [[UIImage imageNamed:@"disclosure"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
        [accessoryButton setImage:disclosureButtonImage forState:UIControlStateNormal];
        annotationView.rightCalloutAccessoryView = accessoryButton;
    }
    return annotationView;
}