public virtual MGLAnnotationImage ImageForAnnotation(MGLMapView mapView, NSObject annotation)
{
if (annotation is MyCustomPointAnnotation)
{
var castAnnotation = (MyCustomPointAnnotation)annotation;
if (!castAnnotation.WillUseImage)
{
return(null);
}
// For better performance, always try to reuse existing annotations.
var annotationImage = mapView.DequeueReusableAnnotationImageWithIdentifier("camera");
// If there is no reusable annotation image available, initialize a new one.
if (annotationImage == null)
{
annotationImage = MGLAnnotationImage.AnnotationImageWithImage(UIImage.FromBundle("camera"), "camera");
}
return(annotationImage);
}
else
{
return(null);
}
}
public virtual MGLAnnotationImage ImageForAnnotation(MGLMapView mapView, NSObject annotation)
{
// Try to reuse the existing ‘pisa’ annotation image, if it exists.
var annotationImage = mapView.DequeueReusableAnnotationImageWithIdentifier("pisa");
if (annotationImage == null)
{
// Leaning Tower of Pisa by Stefan Spieler from the Noun Project.
var image = UIImage.FromBundle("pisavector");
// The anchor point of an annotation is currently always the center. To
// shift the anchor point to the bottom of the annotation, the image
// asset includes transparent bottom padding equal to the original image
// height.
//
// To make this padding non-interactive, we create another image object
// with a custom alignment rect that excludes the padding.
image = image.ImageWithAlignmentRectInsets(new UIEdgeInsets(top: 0, left: 0, bottom: image.Size.Height / 2, right: 0));
// Initialize the ‘pisa’ annotation image with the UIImage we just loaded.
annotationImage = MGLAnnotationImage.AnnotationImageWithImage(image: image, reuseIdentifier: "pisa");
}
return(annotationImage);
}
public MGLAnnotationImage MapView_ImageForAnnotation(MGLMapView mapView, IMGLAnnotation annotation)
{
var fannotation = Element.Annotations.FirstOrDefault(x => x.NativeHandle == annotation.Handle);
switch (fannotation)
{
case SymbolAnnotation symbol:
switch (symbol.IconImage.Source)
{
case FileImageSource fileImageSource:
var cachedImage = mapView.DequeueReusableAnnotationImageWithIdentifier(fileImageSource.File);
if (cachedImage != null) return cachedImage;
var fileImageSourceHandler = new FileImageSourceHandler();
var image = fileImageSourceHandler.LoadImageAsync(fileImageSource).Result;
if (image == null) return null;
return MGLAnnotationImage.AnnotationImageWithImage(image, fileImageSource.File);
}
break;
}
return null;
}
public MGLAnnotationImage MapView_ImageForAnnotation(MGLMapView mapView, IMGLAnnotation annotation)
{
var annotationImage = mapView.DequeueReusableAnnotationImageWithIdentifier("temple");
if (annotationImage == null)
{
var image = UIImage.FromBundle("temple");
image = image.ImageWithAlignmentRectInsets(new UIEdgeInsets(0, 0, image.Size.Height / 2, 0));
annotationImage = MGLAnnotationImage.AnnotationImageWithImage(image, "temple");
}
return(annotationImage);
}