objective c - Restrict the dragging of SKMapView to a certain city -

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i trying restrict dragging of skmapview city.

here have tried, had gone through doc references , open source code. seems skboundingbox that.

but piece of code doesn't work. still allows user pan everywhere. 

skboundingbox *boundingbox = [skboundingbox boundingboxwithtopleftcoordinate:topleftcoordinate bottomrightcoordinate:bottomrightcoordinate];

while there no integrated support this, can workaround.

the file here should replace 1 public sdk demo app viewing workaround (mapdisplayviewcontroller.m).

the idea can bounding box information of city/country maps.json provided us. need implement following callback: 

- (void)mapview:(skmapview *)mapview didchangetoregion:(skcoordinateregion)region {      if (self.bbox) {          if ([self.bbox containslocation:region.center]) {              self.previousregion = region;          } else {              [self.mapview animatetolocation:self.previousregion.center withduration:0.2];          }      }  }

this implementation ensures when user pans out of bounding box of city/country moved previous region contained bounding box.

zoom level restrictions: restricting zoom level possible through zoomlimits property of skmapssettings: 

   skmapzoomlimits zoomlimits;      zoomlimits.mapzoomlimitmin = 5.0f;      zoomlimits.mapzoomlimitmax = 14.0f;      self.mapview.settings.zoomlimits = zoomlimits;

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