Question

我正在尝试将地图的缩放级别设置为仅包含注释，但也不要在3英里半径范围内进行缩放，但我也没有触摸屏幕侧面的注释。此外，我还希望注释一旦缩放到下半部分self.view（我的地图占据整个屏幕）。

我尝试了以下两种方式，但两种方法都没有效果。

//＃1 /////始终缩放以显示我在德克萨斯州的注释，缩小到远，我甚至看不到美国各州

-(void)zoomToFitMapAnnotations:(MKMapView*)aMapView {

if([aMapView.annotations count] == 0) {
    return;
}

CLLocationCoordinate2D topLeftCoord;
topLeftCoord.latitude = -90;
topLeftCoord.longitude = -180;

CLLocationCoordinate2D bottomRightCoord;
bottomRightCoord.latitude = 90;
bottomRightCoord.longitude = -180;

for (id <MKAnnotation> annotation in self.mapView.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;
//Add a little space on both sides
region.span.latitudeDelta = fabs(topLeftCoord.latitude - bottomRightCoord.latitude) * 1.1;
//Add a little extra space on bith sides
region.span.longitudeDelta = fabs(bottomRightCoord.longitude - topLeftCoord.longitude) * 1.1;

region = [aMapView regionThatFits:region];
[self.mapView setRegion:region animated:YES];

}

//＃2 /////这种效果最好，但它放大了很多;在房子的顶部，如果只有一个注释，但我想看到一个注释和4英里半径。因此，除了用户手动缩放之外，我从不想缩小比显示的4平方英里。

MKMapRect zoomRect = MKMapRectNull;
for (id <MKAnnotation> annotation in self.mapView.annotations)
{

    MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
    MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.1, 0.1);
    zoomRect = MKMapRectUnion(zoomRect, pointRect);
}
[self.mapView setVisibleMapRect:zoomRect edgePadding:UIEdgeInsetsMake(300, 300, 100, 300) animated:YES];

Answer 1

  MKMapRect zoomRect = MKMapRectNull;

    for (id <MKAnnotation> annotation in self.mapView.annotations) {
        MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
        MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.1, 0.1);
        if (MKMapRectIsNull(zoomRect)) {
            zoomRect = pointRect;
        }else{
            zoomRect = MKMapRectUnion(zoomRect, pointRect);
        }
    }
    if (zoomRect.size.width == 0.10) /* for single annotation available in map */
    {
        zoomRect = MKMapRectMake(zoomRect.origin.x, zoomRect.origin.y, 100000, 100000);
    }

    [[self mapView] setVisibleMapRect:zoomRect edgePadding:UIEdgeInsetsMake(50, 50, 50, 50) animated:YES];

MKMap缩放以包含注释和区域

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