的MKMapView - 限制地图滚动正方形叠加

Question

我有一个的MKMapView被描述为一个正方形叠加：

CLLocationCoordinate2D coordsBg[5]={ 
    CLLocationCoordinate2DMake(31.750865,35.180882), 
    CLLocationCoordinate2DMake(31.740331,35.180882), 
    CLLocationCoordinate2DMake(31.740331,35.165452), 
    CLLocationCoordinate2DMake(31.750865,35.165452), 
    CLLocationCoordinate2DMake(31.750865,35.180882) 
};  

MKPolygon *bg=[MKPolygon polygonWithCoordinates:coordsBg count:5]; 
[map addOverlay:bg]; 

我想从滚动覆盖的外限制用户。

我可以限制MKMapView的滚动视图吗？或者还有其他方法？

感谢

沙尼

Answer 1

几个小时敲打我的头后，我得到了这个解决方案，为我工作的伟大。

它混淆了：

这篇文章：set the zoom level of an mkmapview

而这个链接：restrict mkmapview scrolling从@Anna卡列尼娜评论我的问题。

，这是我的代码：

- (void)mapView:(MKMapView *)mapView regionWillChangeAnimated:(BOOL)animated 
{ 
    lastGoodMapRect = mapView.visibleMapRect; 
    lastGoodRegion = mapView.region; 
} 

- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated 
{ 

    if (manuallyChangingMapRect) { 
     manuallyChangingMapRect=NO; 
     return; 
    } 

    if([mapView zoomLevel] > 16) 
    { 
     [mapView setCenterCoordinate:lastGoodRegion.center zoomLevel:16 animated:YES]; 
    } 

    MKMapRect visibleRect = mapView.visibleMapRect; 
    MKMapRect OverlayRect = bg.boundingMapRect; 
    MKMapRect intersectionRect = MKMapRectIntersection(visibleRect,OverlayRect); 

    //you can change the min and max zoom off course 
    if(!MKMapRectEqualToRect(visibleRect,intersectionRect)){ 
     if([mapView zoomLevel] < 15){ 

      [mapView setCenterCoordinate:lastGoodRegion.center zoomLevel:15 animated:YES]; 
     }else if([mapView zoomLevel] > 16) 
     { 
      [mapView setCenterCoordinate:lastGoodRegion.center zoomLevel:16 animated:YES]; 
     }else{ 
      manuallyChangingMapRect=YES; 
      [mapView setVisibleMapRect:lastGoodMapRect animated:YES]; 
     } 
    } 

}