MKUserTrackingButton - 如何在不缩小的情况下获取用户位置的中心地图？

I have implemented the MKUserTrackingButton in my map, but the problem is sometimes when it is pressed, it zooms out the map and then it centres on the user's current location. What I want to do is simply centre on the user's location without zooming out. I have implemented the MKUserTrackingButton in