将地图限制在一定范围内？

有没有办法设置地图边界并实际上限制用户只能在这些边界内平移？

我最接近我需要的是mapView.fitBounds方法，但它似乎根本不限制平移。我做错了什么或者这个方法没有达到我的需要吗？

我正在使用 SKMaps iOS SDK 版本 2.5

Thanks!

这是我写的一些代码（基于这个答案） https://stackoverflow.com/questions/32268244/android-skobbler-how-to-limit-map-view-in-an-area将用户绑定在由左上坐标和右下坐标定义的边界框中。

In my viewDidLoad像这样启动mapView对象之后

mapView = [[SKMapView alloc] initWithFrame:CGRectMake( 0.0f, 0.0f,  CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame) )];

//Setting the zoom limit, (totally optional)
SKMapZoomLimits zoomLimits;
zoomLimits.mapZoomLimitMin = 15.153500;
zoomLimits.mapZoomLimitMax = 21;
mapView.settings.zoomLimits = zoomLimits;

//Creating our bounding box by specifying a top left point, and a bottom right
CLLocationCoordinate2D topLeftBoundary;
topLeftBoundary.longitude = 21.174489;
topLeftBoundary.latitude = 39.777993;

CLLocationCoordinate2D botRightBoundary;
botRightBoundary.longitude = 21.191678;
botRightBoundary.latitude = 39.765834;

_boundaries = [SKBoundingBox boundingBoxWithTopLeftCoordinate:topLeftBoundary bottomRightCoordinate:botRightBoundary];
}

然后我定义isInBoundingBox method.

-(BOOL) isInBoundingBox: (SKCoordinateRegion)regionBox {
    if (_boundaries.topLeftCoordinate.latitude < regionBox.center.latitude || _boundaries.bottomRightCoordinate.latitude > regionBox.center.latitude ||
    _boundaries.topLeftCoordinate.longitude > regionBox.center.longitude || _boundaries.bottomRightCoordinate.longitude < regionBox.center.longitude)
    {
        return false;    
    }
return true;
}

然后在我们的didChangeToRegion我们这样做的方法：

- (void)mapView:(SKMapView*)curMapView didChangeToRegion:(SKCoordinateRegion)region{
    //NSLog(@" @@@@@@@@ did change to ZOOM LEVEL: %f and lat: %f, long: %f",region.zoomLevel, region.center.latitude, region.center.longitude);

    BOOL inBoundingBox = [self isInBoundingBox:region];
    if (inBoundingBox) {
        // if mapRegion is valid save it
        _lastValidRegion = region;
    } else {
        // if mapRegion is invalid reposition the map inside the bounding box
        [mapView setVisibleRegion:_lastValidRegion];
    }
}