React native 如何获取当前地图视图的边界？

如何自动获取当前地图视图的边界？我到处找了。谷歌地图API有以下功能：

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如果您需要，最好为React Native执行此操作，然后您可以为MKMapView提供一个扩展，如下所示

extension MKMapView {
    func getBounds() -> (southWestPoint: CLLocationCoordinate2D, northEastPoint: CLLocationCoordinate2D) {
        let visibleMapRect = self.visibleMapRect
        let neMapPoint = MKMapPointMake(MKMapRectGetMaxX(visibleMapRect), visibleMapRect.origin.y)
        let swMapPoint = MKMapPointMake(visibleMapRect.origin.x, MKMapRectGetMaxY(visibleMapRect))
        return (southWestPoint: MKCoordinateForMapPoint(swMapPoint), northEastPoint:MKCoordinateForMapPoint(neMapPoint))
    }
}

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无论何时需要绑定，只需调用getBounds方法。

如果需要，则可以为MKMapView提供一个扩展，如下所示

extension MKMapView {
    func getBounds() -> (southWestPoint: CLLocationCoordinate2D, northEastPoint: CLLocationCoordinate2D) {
        let visibleMapRect = self.visibleMapRect
        let neMapPoint = MKMapPointMake(MKMapRectGetMaxX(visibleMapRect), visibleMapRect.origin.y)
        let swMapPoint = MKMapPointMake(visibleMapRect.origin.x, MKMapRectGetMaxY(visibleMapRect))
        return (southWestPoint: MKCoordinateForMapPoint(swMapPoint), northEastPoint:MKCoordinateForMapPoint(neMapPoint))
    }
}

无论何时需要绑定，只要调用getBounds方法即可