Why isn't the glyphimage of MKMarkerAnnotationView showing up?

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There could be several reasons why the glyph image of MKMarkerAnnotationView is not showing up:

1. Make sure that the glyphImage property is set to a valid UIImage object. If this property is not set, the view will not display a glyph.

2. Check the color and size of the glyphImage. By default, the glyphImage is white and has a size of 40x40 points. If you have set a custom color or size, make sure it is appropriate for your use case.

3. Ensure that the annotation is being added to the map view and that the viewForAnnotation method is being called. If this method is not implemented or is not calling the super implementation, the annotation view will not be displayed.

4. Check the z-index of the annotation view. If there are other views or annotations on top of the annotation view, it might be hidden from view.

5. Make sure that the markerTintColor and title properties of the MKMarkerAnnotationView are set appropriately. If these properties are set to nil or invalid values, the annotation view might not be visible.

6. Lastly, ensure that the map view is properly configured and visible. If the map view is not visible or has some other issue, the annotation view might not be displayed.