ios - MKMapView zoom to fit annotations while locking center -


i'm trying zoom fit annotations on map while locking center , providing insets.

- (void)fitannotations:(nsarray *)annotations edgeinsets:(uiedgeinsets)insets {     cllocationcoordinate2d originalcenter = self.centercoordinate;     mkmaprect maprect = mkmaprectnull;      (id<mkannotation> annotation in annotations) {         mkmappoint p = mkmappointforcoordinate([annotation coordinate]);         maprect = mkmaprectunion(maprect, mkmaprectmake(p.x, p.y, 0, 0));     }      maprect = [self maprectthatfits:maprect edgepadding:insets];     mkcoordinateregion mapregion = mkcoordinateregionformaprect(maprect);      // try go original center, while increasing span neccessary amount     mkcoordinatespan centeringdelta = mkcoordinatespanmake(fabs(mapregion.center.latitude - originalcenter.latitude), fabs(mapregion.center.longitude - originalcenter.longitude));     mapregion.center = originalcenter;     mapregion.span.latitudedelta += centeringdelta.latitudedelta * 2.0;     mapregion.span.longitudedelta += centeringdelta.longitudedelta * 2.0;     mapregion = [self regionthatfits:mapregion];     [self setregion:mapregion animated:yes]; }

the first part of code here works expected: zooms fit while respecting insets. however, shifts center.

i try re-adjust center after that, fails. i'm not sure if math on re-centering correct.

try this, use calculated maprect create new region originalcenter via mkcoordinateregionmake method

mkcoordinateregion mapregion = mkcoordinateregionformaprect(maprect); mapregion = mkcoordinateregionmake(originalcenter, mapregion.span); mapview.region = mapregion;

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