縮放以適合非站點尺寸地圖的所有註釋

Question

我找到了有關縮放的主題以適合標準尺寸方法的所有註釋。我使用的代碼，但問題是地圖只有150'的高度（但立場寬度）。我使用的代碼一切看起來很好。但問題是地圖的上邊緣上顯示的引腳總是不適合地圖區域

這裏是代碼。我試圖增加填充，但地圖仍然看起來不平衡。似乎我必須重新計算跨度的中心點。任何人都有這個非標準大小的地圖的解決方案？我注意到在foursquare應用程序中，它確實存在我面對的相同問題，因爲當地圖很小時，上邊緣顯示的引腳不適合。

在此先感謝

(void)zoomMapViewToFitAnnotations:(MKMapView *)mapView animated:(BOOL)animated 
{ 

NSArray *annotations = mapView.annotations; 
int count = [mapView.annotations count]; 
if (count == 0) { return; } //bail if no annotations 

//convert NSArray of id <MKAnnotation> into an MKCoordinateRegion that can be used to set the map size 
//can't use NSArray with MKMapPoint because MKMapPoint is not an id 
MKMapPoint points[count]; //C array of MKMapPoint struct 

for(int i=0; i<count; i++) //load points C array by converting coordinates to points 
{ 
    CLLocationCoordinate2D coordinate = [(id <MKAnnotation>)[annotations objectAtIndex:i] coordinate]; 
    points[i] = MKMapPointForCoordinate(coordinate); 
} 



//create MKMapRect from array of MKMapPoint 

MKMapRect mapRect = [[MKPolygon polygonWithPoints:points count:count] boundingMapRect]; 
//convert MKCoordinateRegion from MKMapRect 
MKCoordinateRegion region = MKCoordinateRegionForMapRect(mapRect); 

//add padding so pins aren't scrunched on the edges 
    region.span.latitudeDelta *= 1.5*ANNOTATION_REGION_PAD_FACTOR; 
    region.span.longitudeDelta *= ANNOTATION_REGION_PAD_FACTOR; 
//but padding can't be bigger than the world 
    if(region.span.latitudeDelta > MAX_DEGREES_ARC) { region.span.latitudeDelta = MAX_DEGREES_ARC; } 
if(region.span.longitudeDelta > MAX_DEGREES_ARC){ region.span.longitudeDelta = MAX_DEGREES_ARC; } 

    //and don't zoom in stupid-close on small samples 
if(region.span.latitudeDelta < MINIMUM_ZOOM_ARC) { region.span.latitudeDelta = MINIMUM_ZOOM_ARC; } 
if(region.span.longitudeDelta < MINIMUM_ZOOM_ARC) { region.span.longitudeDelta = MINIMUM_ZOOM_ARC; } 
//and if there is a sample of 1 we want the max zoom-in instead of max zoom-out 
if(count == 1) 
{ 
    region.span.latitudeDelta = MINIMUM_ZOOM_ARC; 
    region.span.longitudeDelta = MINIMUM_ZOOM_ARC; 
} 
[mapView setRegion:region animated:animated]; 

}

Answer 1

檢查了這一點，

- (void)zoomToFitMapAnnotations:(MKMapView *)theMapView { 
    if ([theMapView.annotations count] == 0) return; 

    CLLocationCoordinate2D topLeftCoord; 
    topLeftCoord.latitude = -180; 
    topLeftCoord.longitude = 360; 

    CLLocationCoordinate2D bottomRightCoord; 
    bottomRightCoord.latitude = 180; 
    bottomRightCoord.longitude = -360; 

    for (id <MKAnnotation> annotation in theMapView.annotations) { 
     topLeftCoord.longitude = fmin(topLeftCoord.longitude, annotation.coordinate.longitude); 
     topLeftCoord.latitude = fmax(topLeftCoord.latitude, annotation.coordinate.latitude); 
     bottomRightCoord.longitude = fmax(bottomRightCoord.longitude, annotation.coordinate.longitude); 
     bottomRightCoord.latitude = fmin(bottomRightCoord.latitude, annotation.coordinate.latitude); 
    } 

    MKCoordinateRegion region; 
    region.center.latitude = topLeftCoord.latitude - (topLeftCoord.latitude - bottomRightCoord.latitude) * 0.5; 
    region.center.longitude = topLeftCoord.longitude + (bottomRightCoord.longitude - topLeftCoord.longitude) * 0.5; 
    region.span.latitudeDelta = fabs(topLeftCoord.latitude - bottomRightCoord.latitude) * 1.1; 

    region.span.longitudeDelta = fabs(bottomRightCoord.longitude - topLeftCoord.longitude) * 1.1; 

    region = [theMapView regionThatFits:region]; 
    [theMapView setRegion:region animated:YES]; 
}