限制MKMapView滚动

我正在尝试将自定义图像添加到
MKMapView
作为
MKOverlayView
 - 我需要限制用户能够滚动到覆盖范围之外。有没有现成的功能呢？还是其他任何建议？ 谢谢，马特     
2019-07-22 5 条评论
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没有找到相关结果

    已邀请:

    蜗仓馈

    如果您只想冻结叠加层上的地图视图，可以将地图视图的区域设置为叠加层的边界，并将
    scrollEnabled
    和
    zoomEnabled
    设置为
    NO
    。 但这不会让用户在叠加层的边界内滚动或缩放。 没有内置的方法将地图视图限制为叠加层的边界，因此您必须手动执行此操作。首先，确保你的
    MKOverlay
    对象实现了
    boundingMapRect
    属性。然后可以在
    regionDidChangeAnimated
    委托方法中使用它来根据需要手动调整视图。 这是一个如何做到这一点的例子。 下面的代码应该在具有
    MKMapView
    的类中。 确保地图视图最初设置为可以显示叠加层的区域。 
    //add two ivars to the .h...
MKMapRect lastGoodMapRect;
BOOL manuallyChangingMapRect;

//in the .m...
- (void)mapView:(MKMapView *)mapView regionWillChangeAnimated:(BOOL)animated
{
    if (manuallyChangingMapRect)
        return;     
    lastGoodMapRect = mapView.visibleMapRect;
}

- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated
{
    if (manuallyChangingMapRect) //prevents possible infinite recursion when we call setVisibleMapRect below
        return;     

    // "theOverlay" below is a reference to your MKOverlay object.
    // It could be an ivar or obtained from mapView.overlays array.

    BOOL mapContainsOverlay = MKMapRectContainsRect(mapView.visibleMapRect, theOverlay.boundingMapRect);

    if (mapContainsOverlay)
    {
        // The overlay is entirely inside the map view but adjust if user is zoomed out too much...
        double widthRatio = theOverlay.boundingMapRect.size.width / mapView.visibleMapRect.size.width;
        double heightRatio = theOverlay.boundingMapRect.size.height / mapView.visibleMapRect.size.height;
        if ((widthRatio < 0.6) || (heightRatio < 0.6)) //adjust ratios as needed
        {
            manuallyChangingMapRect = YES;
            [mapView setVisibleMapRect:theOverlay.boundingMapRect animated:YES];
            manuallyChangingMapRect = NO;
        }
    }
    else
        if (![theOverlay intersectsMapRect:mapView.visibleMapRect])
        {
            // Overlay is no longer visible in the map view.
            // Reset to last "good" map rect...
            [mapView setVisibleMapRect:lastGoodMapRect animated:YES];
        }   
}
    我尝试使用内置的
    MKCircle
    覆盖图，似乎效果很好。 编辑： 它在95％的时间内都能很好地工作，但是，我通过一些测试证实它可能在两个位置之间振荡，然后进入无限循环。所以，我编辑了一下，我认为这应该可以解决问题： 
    // You can safely delete this method:
- (void)mapView:(MKMapView *)mapView regionWillChangeAnimated:(BOOL)animated {

}

- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated {
     // prevents possible infinite recursion when we call setVisibleMapRect below
    if (manuallyChangingMapRect) {
        return;
    }

    // "theOverlay" below is a reference to your MKOverlay object.
    // It could be an ivar or obtained from mapView.overlays array.

    BOOL mapContainsOverlay = MKMapRectContainsRect(mapView.visibleMapRect, theOverlay.boundingMapRect);

    if (mapContainsOverlay) {
        // The overlay is entirely inside the map view but adjust if user is zoomed out too much...
        double widthRatio = theOverlay.boundingMapRect.size.width / mapView.visibleMapRect.size.width;
        double heightRatio = theOverlay.boundingMapRect.size.height / mapView.visibleMapRect.size.height;
        // adjust ratios as needed
        if ((widthRatio < 0.6) || (heightRatio < 0.6)) {
            manuallyChangingMapRect = YES;
            [mapView setVisibleMapRect:theOverlay.boundingMapRect animated:YES];
            manuallyChangingMapRect = NO;
        }
    } else if (![theOverlay intersectsMapRect:mapView.visibleMapRect]) {
        // Overlay is no longer visible in the map view.
        // Reset to last "good" map rect...
        manuallyChangingMapRect = YES;
        [mapView setVisibleMapRect:lastGoodMapRect animated:YES];
        manuallyChangingMapRect = NO;
    } else {
        lastGoodMapRect = mapView.visibleMapRect;
    }
}
    如果有人正在寻找快速的
    MKOverlay
    解决方案，这里有一个： 
    - (void)viewDidLoad {
    [super viewDidLoad];

    MKCircle* circleOverlay = [MKCircle circleWithMapRect:istanbulRect];
    [_mapView addOverlay:circleOverlay];

    theOverlay = circleOverlay;
}

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay {
    MKCircleView* circleOverlay = [[MKCircleView alloc] initWithCircle:overlay];
    [circleOverlay setStrokeColor:[UIColor mainColor]];
    [circleOverlay setLineWidth:4.f];

    return circleOverlay;
}
        
    2019-07-22 0 0
    分享

    董碘奴星

    在我的例子中，我需要将边界限制为具有upperleft / lowerRight坐标的平铺覆盖。上面的代码仍然运行良好，但替换了OverMap.boundingMapRect为MKMapRect paddedBoundingMapRect 
    - (void)mapView:(MKMapView *)_mapView regionDidChangeAnimated:(BOOL)animated
{
if (manuallyChangingMapRect) //prevents possible infinite recursion when we call setVisibleMapRect below
    return;     

[self updateDynamicPaddedBounds];

MKMapPoint pt =  MKMapPointForCoordinate( mapView.centerCoordinate);

BOOL mapInsidePaddedBoundingRect = MKMapRectContainsPoint(paddedBoundingMapRect,pt );

if (!mapInsidePaddedBoundingRect)
{
    // Overlay is no longer visible in the map view.
    // Reset to last "good" map rect...

    manuallyChangingMapRect = YES;
    [mapView setVisibleMapRect:lastGoodMapRect animated:YES];
    manuallyChangingMapRect = NO;


}


-(void)updateDynamicPaddedBounds{

ENTER_METHOD;

CLLocationCoordinate2D  northWestPoint= CLLocationCoordinate2DMake(-33.841171,151.237318 );
CLLocationCoordinate2D  southEastPoint= CLLocationCoordinate2DMake(-33.846127, 151.245058);



MKMapPoint upperLeft = MKMapPointForCoordinate(northWestPoint);
MKMapPoint lowerRight = MKMapPointForCoordinate(southEastPoint);
double width = lowerRight.x - upperLeft.x;
double height = lowerRight.y - upperLeft.y;


MKMapRect mRect = mapView.visibleMapRect;
MKMapPoint eastMapPoint = MKMapPointMake(MKMapRectGetMinX(mRect), MKMapRectGetMidY(mRect));
MKMapPoint westMapPoint = MKMapPointMake(MKMapRectGetMaxX(mRect), MKMapRectGetMidY(mRect));
MKMapPoint northMapPoint = MKMapPointMake(MKMapRectGetMidX(mRect), MKMapRectGetMaxY(mRect));
MKMapPoint southMapPoint = MKMapPointMake(MKMapRectGetMidX(mRect), MKMapRectGetMinY(mRect));

double xMidDist = abs(eastMapPoint.x -  westMapPoint.x)/2;
double yMidDist = abs(northMapPoint.y -  southMapPoint.y)/2;


upperLeft.x = upperLeft.x + xMidDist;
upperLeft.y = upperLeft.y + yMidDist;


double paddedWidth =  width - (xMidDist*2); 
double paddedHeight = height - (yMidDist*2);

paddedBoundingMapRect= MKMapRectMake(upperLeft.x, upperLeft.y, paddedWidth, paddedHeight);
    }     
    2019-07-22 0 0
    分享

    括宠

    在Swift 3.0中的Anna（https://stackoverflow.com/a/4126011/3191130）解决方案，我添加了一个扩展： 
    extension HomeViewController: MKMapViewDelegate {
func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
    if manuallyChangingMapRect {
        return
    }
    guard let overlay = self.mapOverlay else {
        print("Overlay is nil")
        return
    }
    guard let lastMapRect = self.lastGoodMapRect else {
        print("LastGoodMapRect is nil")
        return
    }

    let mapContainsOverlay = MKMapRectContainsRect(mapView.visibleMapRect, overlay.boundingMapRect)
    if mapContainsOverlay {
        let widthRatio: Double = overlay.boundingMapRect.size.width / mapView.visibleMapRect.size.width
        let heightRatio: Double = overlay.boundingMapRect.size.height / mapView.visibleMapRect.size.height
        // adjust ratios as needed
        if (widthRatio < 0.9) || (heightRatio < 0.9) {
            manuallyChangingMapRect = true
            mapView.setVisibleMapRect(overlay.boundingMapRect, animated: true)
            manuallyChangingMapRect = false
        }
    } else if !overlay.intersects(mapView.visibleMapRect) {
            // Overlay is no longer visible in the map view.
            // Reset to last "good" map rect...
            manuallyChangingMapRect = true
            mapView.setVisibleMapRect(lastMapRect, animated: true)
            manuallyChangingMapRect = false
        }
        else {
            lastGoodMapRect = mapView.visibleMapRect
    }
}
}
    要设置地图，请使用以下命令： 
    override func viewDidLoad() {
    super.viewDidLoad()
    setupMap()
}

func setupMap() {
    mapView.delegate = self
    let radius:CLLocationDistance = 1000000
    mapOverlay = MKCircle(center: getCenterCoord(), radius: radius)
    if let mapOverlay = mapOverlay  {
        mapView.add(mapOverlay)
    }
    mapView.setRegion(MKCoordinateRegionMake(getCenterCoord(), getSpan()), animated: true)
    lastGoodMapRect = mapView.visibleMapRect
}

func getCenterCoord() -> CLLocationCoordinate2D {
    return CLLocationCoordinate2DMake(LAT, LON)
}
func getSpan() -> MKCoordinateSpan {
    return MKCoordinateSpanMake(10, 10)
}
        
    2019-07-22 0 0
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    磐去裸猜饲

      Swift 4的一个很好的答案 使用以下代码，您可以检测滚动的绑定限制 注意：在下面的代码5000中，数字是以米为单位的限制区域的数量。所以你可以这样使用>
    let restricedAreaMeters = 5000
     
    func detectBoundingBox(location: CLLocation) {
        let latRadian = degreesToRadians(degrees: CGFloat(location.coordinate.latitude))
        let degLatKm = 110.574235
        let degLongKm = 110.572833 * cos(latRadian)
        let deltaLat = 5000 / 1000.0 / degLatKm 
        let deltaLong = 5000 / 1000.0 / degLongKm

        southLimitation = location.coordinate.latitude - deltaLat
        westLimitation = Double(CGFloat(location.coordinate.longitude) - deltaLong)
        northLimitation =  location.coordinate.latitude + deltaLat
        eastLimitation = Double(CGFloat(location.coordinate.longitude) + deltaLong)
    }

    func degreesToRadians(degrees: CGFloat) -> CGFloat {
        return degrees * CGFloat(M_PI) / 180
    }
    如果用户从有界区域出来，最后用下面的方法将返回到最新的允许坐标。 
     var lastCenterCoordinate: CLLocationCoordinate2D!
 extension UIViewController: MKMapViewDelegate {
        func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool) { 
           let coordinate = CLLocationCoordinate2DMake(mapView.region.center.latitude, mapView.region.center.longitude) 
           let latitude = mapView.region.center.latitude
           let longitude = mapView.region.center.longitude

            if latitude < northLimitation && latitude > southLimitation && longitude < eastLimitation && longitude > westLimitation {
                lastCenterCoordinate = coordinate
            } else {
                span = MKCoordinateSpanMake(0, 360 / pow(2, Double(16)) * Double(mapView.frame.size.width) / 256)
                let region = MKCoordinateRegionMake(lastCenterCoordinate, span)
                mapView.setRegion(region, animated: true)
            }
        }
 }
        
    2019-07-22 0 0
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