在地图上显示之前删除图钉

Question

在地图上显示 Pin 图之前，我必须确保将它们从地图上删除，这样它就不会过度显示，因为显示的过程是放在 viewWillAppear 方法中的。我的相关代码是这样的：

    -(void)viewWillAppear:(BOOL)animated{

            //before doing anything, i want to remove all Pins
            RMMarkerManager *markerManager=[mapView markerManager];
            [mapView setDelegate:self];
        [mapView setBackgroundColor:[UIColor grayColor]];
        [mapView moveToLatLong:currentLocation];
        [mapView.contents setZoom: 13];
        [self.view addSubview:mapView];
        RMMarker *marker=[[RMMarker alloc] initWithUIImage:[UIImage imageNamed:@"marker-blue.png"]];
        [marker setTextForegroundColor:[UIColor blueColor]];
        [marker changeLabelUsingText:@"Vous êtes ici"];
        [markerManager addMarker:marker
                       AtLatLong:currentLocation];
    [marker release];
    }

请问我该怎么做？提前致谢

Answer 1

只需调用 RMMarkerManager 的 removeMarkers 方法即可完成，因此将是这样的：

-(void)viewWillAppear:(BOOL)animated{

    //remove all markers before starting    
    RMMarkerManager *markerManager=[mapView markerManager];
    [markerManager removeMarkers];

    //do what ever you want...

}