在MKMapViewDelegate里有个方法

- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated  

这个方法就是在Map移动 后执行，所以我们可以在这里获取移动后地图中心点的经纬度了。

 - (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated {
    MKCoordinateRegion region;
    CLLocationCoordinate2D centerCoordinate = mapView.region.center;
    region.center= centerCoordinate;
    //中心点坐标
    NSLog(@" regionDidChangeAnimated %f,%f",centerCoordinate.latitude, centerCoordinate.longitude);
}

PS:获取用户点击地图某个区域的经纬度

方法如下

在ViewDidLoad里添加tabGuesture

 UITapGestureRecognizer *mTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapPress:)];
    [self.mapView addGestureRecognizer:mTap];

-(void)tapPress:(UIGestureRecognizer*)gestureRecognizer
{
    
    CGPoint touchPoint = [gestureRecognizer locationInView:self.mapView ];
    CLLocationCoordinate2D touchMapCoordinate =
    [self.mapView convertPoint:touchPoint toCoordinateFromView:self.mapView ];
    //点击位置的经纬度
    NSLog(@"%f %f",touchMapCoordinate.latitude, touchMapCoordinate.longitude);
}