顯示到當前定位位置
-(void)didupdatebmkuserlocation:(bmkuserlocation *)userlocation
{
nslog(@"當前位置%f,%f",userlocation.location.coordinate.latitude,userlocation.location.coordinate.longitude);
[_mapview updatelocationdata:userlocation];
_mapview.centercoordinate = userlocation.location.coordinate;
cllocationcoordinate2d loc = [userlocation.location coordinate];
//放大地圖到自身的經緯度位置。
bmkcoordinateregion viewregion = bmkcoordinateregionmake(loc, bmkcoordinatespanmake(0.02f,0.02f));
bmkcoordinateregion adjustedregion = [_mapview regionthatfits:viewregion];
[_mapview setregion:adjustedregion animated:yes];
}