地图设置可视范围 'Invalid Region '

1 今天做地图定位，发现出现这个问题 ，调用以下函数，出现问题MKCoordinateRegion region = MKCoordinateRegionMake(_currentLocationCoordinate, MKCoordinateSpanMake(zoomLevel, zoomLevel)); [_mapView setRegion:[_mapView regionThatFits:region] animated:YES];Exception : 'Invalid Region' when trying to display the map

2 度娘了一下，原来是超出范围了，加上范围判断

if ( (region.center.latitude >= -90) && (region.center.latitude <= 90) && (region.center.longitude >= -180) && (region.center.longitude <= 180) ){ [_mapView setRegion:[_mapView regionThatFits:region] animated:YES]; } else{ NSLog(@"invilid region"); }

3 究其根本，数据出错，后来找了原因，latitude 118，错了，已经超过范围-90<＝latitude<=90-180<=longtitude<=180