ios - 无法在 MapView 中显示标记

Question

我正在使用 RubyMotion 和 MapBox 创建一个应用程序。我想要一个带标记的离线 map 。我可以看到 map ，但看不到标记。这是我的代码:

class MapScreen < PM::Screen

  def on_load
    RMConfiguration.configuration.setAccessToken("...")

    self.view.addSubview(map_view)

    annotation = RMPointAnnotation.alloc.initWithMapView(map_view, coordinate: map_view.centerCoordinate, andTitle: 'Hello')
    map_view.addAnnotation(annotation)
  end

  def map_view
    return @map_view if @map_view
    source = RMMBTilesSource.alloc.initWithTileSetResource('control-room-0.2.0',
      ofType:'mbtiles')
    @map_view ||= RMMapView.alloc.initWithFrame(self.view.bounds, andTilesource:source).tap do |map|
      map.zoom = 2
      map.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth
      map.setCenterCoordinate(CLLocationCoordinate2D.new(0, 0))
      map.showsUserLocation = true
    end
  end

end

有解决办法吗？

Answer 1

该代码应该可以工作:

class MapScreen < PM::Screen 

    def on_load 
        RMConfiguration.configuration.setAccessToken("...")
        self.view.addSubview(map_view) 
        annotation = RMAnnotation.alloc.initWithMapView(map_view, coordinate: map_view.centerCoordinate, andTitle: 'Hello') 
        map_view.addAnnotation(annotation) 
    end 

    def map_view 
        return @map_view if @map_view 
        source = RMMBTilesSource.alloc.initWithTileSetResource('control-room-0.2.0', ofType:'mbtiles') 
        @map_view ||= RMMapView.alloc.initWithFrame(self.view.bounds, andTilesource:source).tap do |map| 
            map.zoom = 4 
            map.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth 
            map.setCenterCoordinate(CLLocationCoordinate2D.new(0, 0)) 
            map.showsUserLocation = true 
            map.delegate = self 
        end
    end  

    def mapView(map_view, layerForAnnotation:annotation) 
        image = UIImage.imageNamed('list.png') 
        RMMarker.alloc.initWithUIImage(image) 
    end 

end