1、判断手机里是否已经安装了百度地图或者高德地图：

BOOL hasBaiduMap = NO;          BOOL hasGaodeMap = NO;                    if ([[UIApplication sharedApplication]canOpenURL:[NSURL URLWithString:@"baidumap://map/"]]){              hasBaiduMap = YES;          }          if ([[UIApplication sharedApplication]canOpenURL:[NSURL URLWithString:@"iosamap://"]]){              hasGaodeMap = YES;          }

 2、选择打开对应的地图进行导航：

if ([@"使用百度地图导航" isEqualToString:title])          {              NSString *urlString = [[NSString stringWithFormat:@"baidumap://map/direction?origin=latlng:%f,%f|name:我的位置&destination=latlng:%f,%f|name:终点&mode=driving",currentLat, currentLon,_shopLat,_shopLon] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding] ;                            [[UIApplication sharedApplication]openURL:[NSURL URLWithString:urlString]];          }          else if ([@"使用高德地图导航" isEqualToString:title])          {              NSString *urlString = [[NSString stringWithFormat:@"iosamap://navi?sourceApplication=%@&backScheme=%@&poiname=%@&lat=%f&lon=%f&dev=1&style=2",@"app name", yourscheme, @"终点", _shopLat, _shopLon] stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];                [[UIApplication sharedApplication]openURL:[NSURL URLWithString:urlString]];          }