Question

我在GMSMapView中添加了GMSPolygon，当我点击按钮更新多边形的纬度和经度时，它根本就没有更新。我只能看到旧的多边形。

这是我从NSArray获取坐标并显示多边形的代码，它的工作非常完美。

-(void)loadAreasInMap{

    for(NSArray *polygon in [[vehicle model] area]){
        self.path = [GMSMutablePath path];

                for(int i = 0; i < [[polygon  valueForKey:@"polygon_coordinates"] count]; i++){

                    [self.path addCoordinate:CLLocationCoordinate2DMake([[[[polygon  valueForKey:@"polygon_coordinates"] objectAtIndex:i] objectAtIndex:1] floatValue],[[[[polygon  valueForKey:@"polygon_coordinates"] objectAtIndex:i] objectAtIndex:0] floatValue])];
                }

                GMSPolygon *rectangle = [GMSPolygon polygonWithPath:self.path];
                rectangle.fillColor = [UIColor colorWithRed:255.0/255.0 green:0.0/255.0 blue:0.0/255.0 alpha:0.4];
                rectangle.map = self.mapView;

    }

    [self.mapView bringSubviewToFront:self.locationMarkerView];
    CLLocation *userLocation = [[locManager sharedManager] userLocation];
    GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:userLocation.coordinate.latitude
                                                            longitude:userLocation.coordinate.longitude
                                                                 zoom:7];
    self.mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera];



}

现在，当我点击按钮时，我将调用此方法更新我的坐标并重新绘制多边形，但我可以看到所有日志说方法正常工作但地图没有更新。

 -(void)buttonClicked{

   [self.mapView clear];
   [self.loadAreasInMap];
 }

请告诉我如何更新地图

Answer 1

如果将多边形定义为实例变量，使用虚拟路径加载多边形并将.map属性设置为nil，该怎么办？然后单击该按钮时，使用新路径加载多边形，并将map属性设置为地图视图。

GMSPolygon *rectangle;

你初始化的某个地方用虚拟路径填充它：

    GMSMutablePath *path = [[GMSMutablePath alloc] init];
    [path addCoordinate:CLLocationCoordinate2DMake(0.0,0.0)];
    [path addCoordinate:CLLocationCoordinate2DMake(0.1,0.0)];
    [path addCoordinate:CLLocationCoordinate2DMake(0.0,0.1)];

    rectangle = [GMSPolygon  polygonWithPath:path];
    rectangle.map = nil;

然后在您的函数中，加载新路径并设置rectangle.map = mapView;

您无需清除整个地图。

Google地图GMSPolygon未在iOS中更新

1 个答案: