Question

如何使用google maps sdk为iOS拟合坐标数组的边界？我需要缩放4个可见标记的地图。

Answer 1

这是我解决这个问题的方法。通过多个坐标构建GMSCoordinateBounds对象。

- (void)focusMapToShowAllMarkers
{       
    CLLocationCoordinate2D myLocation = ((GMSMarker *)_markers.firstObject).position;
    GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc] initWithCoordinate:myLocation coordinate:myLocation];

    for (GMSMarker *marker in _markers)
        bounds = [bounds includingCoordinate:marker.position];

    [_mapView animateWithCameraUpdate:[GMSCameraUpdate fitBounds:bounds withPadding:15.0f]];
}

更新的答案：由于不推荐使用GMSMapView markers 属性，因此您应该将所有标记保存在自己的数组中。

更新swift 3回答：

    func focusMapToShowAllMarkers() {
        let firstLocation = (markers.first as GMSMarker).position
        var bounds = GMSCoordinateBoundsWithCoordinate(firstLocation, coordinate: firstLocation)

        for marker in markers {
            bounds = bounds.includingCoordinate(marker.position)
        }
        let update = GMSCameraUpdate.fitBounds(bounds, withPadding: CGFloat(15))
        self.mapView.animate(cameraUpdate: update)
  }

Answer 2

Swift 3.0 版本的Lirik回答：

func focusMapToShowAllMarkers() {
    let myLocation: CLLocationCoordinate2D = self.markers.first!.position
    var bounds: GMSCoordinateBounds = GMSCoordinateBounds(coordinate: myLocation, coordinate: myLocation)

    for marker in self.markers {
        bounds = bounds.includingCoordinate(marker.position)
        self.mapView.animate(with: GMSCameraUpdate.fit(bounds, withPadding: 15.0))
    }
}

这是我自己的方式：

func focusMapToShowMarkers(markers: [GMSMarker]) {

    guard let currentUserLocation = self.locationManager.location?.coordinate else {
        return
    }

    var bounds: GMSCoordinateBounds = GMSCoordinateBounds(coordinate: currentUserLocation,
                                                          coordinate: currentUserLocation)

    _ = markers.map {
        bounds = bounds.includingCoordinate($0.position)
        self.mapView.animate(with: GMSCameraUpdate.fit(bounds, withPadding: 15.0))
    }
}

你可以这样调用我的函数：

self.focusMapToShowMarkers(markers: [self.myLocationMarker, currentPokemonMarker])

Answer 3

暂时，Google终于实施了GMSCoordinateBounds，你可以使用GMSCameraUpdate来使用它。

有关详细信息，请查看官方reference。

Answer 4

迅速5 版本的Lirik的答案：

    func focusMapToShowAllMarkers() {

        if arrMarkers.count > 0 {
            let firstLocation = (arrMarkers.first!).position
            var bounds = GMSCoordinateBounds(coordinate: firstLocation, coordinate: firstLocation)

            for marker in arrMarkers {
              bounds = bounds.includingCoordinate(marker.position)
            }

           let update = GMSCameraUpdate.fit(bounds, withPadding: CGFloat(15))
           self.mapView.animate(with: update)
        }
    }

Answer 5

我们可以使用如下代码将其简化：

extension Array where Element: GMSMarker {
  func encompassingCoordinateBounds() -> GMSCoordinateBounds {
    reduce(GMSCoordinateBounds(), { $0.includingCoordinate($1.position) })
  }
}

呼叫站点希望：

let markers = [GMSMarker]()
let encompassingCoordinateBounds = markers.encompassingCoordinateBounds()

如何将坐标数组的边界与谷歌地图sdk for iOS相匹配？

5 个答案: