iOS-如何将MapView限制在特定区域?-iOS-HowtolimittheMapViewtoaspecificregion?

I have the following problem:

我有以下问题:

I have a "drawn map" (image) which I add to the MapView as an Overlay. No Problem with that.. but I need to limit the MapView to the region of the Overlay, so a user isn't able to scroll/zoom outside of this region.. but it should be possible to scroll/zoom inside the "bounds" of the overlay - means I cannot just disable zoom/scrolling for the MapView.

我有一个“绘制的地图”(图像)，我将它作为叠加添加到MapView中。这个模式没有任何的问题。但是我需要将MapView限制在覆盖区域，这样用户就不能在这个区域之外滚动/缩放。但是在覆盖层的“界限”内滚动/缩放应该是可能的——这意味着我不能仅为MapView禁用缩放/滚动。

Are there any ideas/solution on this topic? The reason for using the MapView/-Kit is that I need to add various POIs to the custom map. This may become more complex when just using an ImageView+ScrollView for presenting the custom map.

关于这个话题有什么想法/解决办法吗?使用MapView/-Kit的原因是我需要向自定义映射添加各种POIs。如果只是使用ImageView+ScrollView来表示定制映射，这可能会变得更加复杂。

I've researched alot on this topic, but I didn't found a nice solution.

关于这个话题我已经研究了很多，但是我没有找到一个好的解决方案。

Any help is appreciated!

任何帮助都是赞赏!

Best Regards, Christian

最好的祝福,基督教

Edit: This is our solution: You supply a topleft and a bottomright coordinate to limit the map. The (minimum) zoomlevel is also limited. I've deactivated decelerating and you are able to bounce a bit out of the map (for better performance/ux). I added a ~1km grey border to the overlay so the user isnÄt able to see the orignal worldmap of google.

编辑:这是我们的解决方案:您提供一个左上角和右下角的坐标来限制映射。zoomlevel也是有限的。我已经停用了减速，您可以从地图上反弹一点(为了更好的性能/用户体验)。我在覆盖层添加了一个~1km的灰色边框，这样用户就可以看到谷歌的原始世界地图了。

LimitedMapView.h:

LimitedMapView.h:

#import 
#import 


@interface LimitedMapView : MKMapView {

}

@property (nonatomic, assign) CLLocationCoordinate2D topLeftCoordinate;
@property (nonatomic, assign) CLLocationCoordinate2D bottomRightCoordinate;


@end

LimitedMapView.m:

LimitedMapView.m:

#import "LimitedMapView.h"

@implementation LimitedMapView

@synthesize topLeftCoordinate, bottomRightCoordinate;

- (void)scrollViewDidZoom:(UIScrollView *)scrollView{

    if([super respondsToSelector:@selector(scrollViewDidZoom:)]) [super scrollViewDidZoom:scrollView];

    if ([self region].span.latitudeDelta > 0.002401f || [self region].span.longitudeDelta > 0.003433f) {

        CLLocationCoordinate2D center = self.centerCoordinate;
        MKCoordinateSpan span = MKCoordinateSpanMake(0.002401f, 0.003433f);

        self.region = MKCoordinateRegionMake(center, span);

    }

}

-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{

    if([super respondsToSelector:@selector(scrollViewDidEndDragging:)]) [super scrollViewDidEndDragging:scrollView willDecelerate:decelerate];

    MKCoordinateRegion currentRegion = self.region;
    bool changeRegiOnLong= YES;
    bool changeRegiOnLat= YES;

    // LONGITUDE    
    if((currentRegion.center.longitude - (currentRegion.span.longitudeDelta/2))  self.bottomRightCoordinate.longitude) {

        currentRegion.center.lOngitude= (bottomRightCoordinate.longitude - (currentRegion.span.longitudeDelta/2));

    } else {

        changeRegiOnLong= NO;

    }

    // LATITUDE    
    if((currentRegion.center.latitude + (currentRegion.span.latitudeDelta/2)) > self.topLeftCoordinate.latitude) {

        currentRegion.center.latitude = (topLeftCoordinate.latitude - (currentRegion.span.latitudeDelta/2));

    } else if((currentRegion.center.latitude - (currentRegion.span.latitudeDelta/2)) 

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
  if ([super respondsToSelector:@selector(scrollViewWillBeginDragging:)])
    [super scrollViewWillBeginDragging:scrollView];
  // do what you want
}

- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated{ 
  if ((mapView.region.span.latitudeDelta > 15.589921 ) || (mapView.region.span.longitudeDelta > 175.836914) ) {
    CLLocationCoordinate2D centerCoord = CLLocationCoordinate2DMake(-41.162114, 172.836914);

    MKCoordinateSpan spanOfNZ = MKCoordinateSpanMake(13.589921, 14.062500 );

    MKCoordinateRegion NZRegion = MKCoordinateRegionMake(centerCoord, spanOfNZ);

    [mapView setRegion: NZRegion animated: YES];
  }

 if (abs(abs(mapView.region.center.latitude) - 41.162114) > (13.589921 / 2) ) {
    CLLocationCoordinate2D centerCoord = CLLocationCoordinate2DMake(-41.162114, 172.836914);

    MKCoordinateSpan spanOfNZ = MKCoordinateSpanMake(13.589921, 14.062500 );

    MKCoordinateRegion NZRegion = MKCoordinateRegionMake(centerCoord, spanOfNZ);

    [mapView setRegion: NZRegion animated: YES];

  }

  if (abs(abs(mapView.region.center.longitude) - 172.836914) > (14.062500 / 2) ) {
    CLLocationCoordinate2D centerCoord = CLLocationCoordinate2DMake(-41.162114, 172.836914);

     MKCoordinateSpan  spanOfNZ = MKCoordinateSpanMake(13.589921, 14.062500 );

     MKCoordinateRegion NZRegion = MKCoordinateRegionMake(centerCoord, spanOfNZ);

     [mapView setRegion: NZRegion animated: YES];
  }
}