ios - 如何根据我的 MKMapView 图片适本地调整缩放级别？

Question

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Answer 1

// delta is the zoom factor // 2 will zoom out x2 // .5 will zoom in by x2

-(void)zoomMap:(MKMapView*)mapView byDelta:(float) delta 
{

    MKCoordinateRegion region = mapView.region;
    MKCoordinateSpan span = mapView.region.span;
    span.latitudeDelta*=delta;
    span.longitudeDelta*=delta;
    region.span=span;
    [mapView setRegion:region animated:YES];

}