您已经有一个名为mapView的实例变量.

you have an instance variable with the name mapView already.

您可以将本地名称更改为其他名称.例如这样的

You can change the local name to something else. For example like this:

-(void)mapView:(MKMapView *)aMapView regionWillChangeAnimated:(BOOL)animated {

     mapRegion=aMapView.region; //first warning
}

-(void)mapView:(MKMapView *)aMapView regionDidChangeAnimated:(BOOL)animated  {
    newRegion=aMapView.region; //second warning
    if(mapRegion.span.latitudeDelta>newRegion.span.latitudeDelta||mapRegion.span.longitudeDelta>newRegion.span.longitudeDelta)
            shouldAdjustZoom=NO;
}