我发现如果我使用：

MapViewController *mapView = [self.storyboard instantiateViewControllerWithIdentifier:@"MapView"];

（MapView是我在故事板中为该场景/视图设置的标识符）

("MapView" is the identifier i set for that scene/view in storyboard)

我只是测试了旧的方式，它适用于我：

and i just tested the old way and it works for me:

mapViewController *mapView = [[mapViewController alloc] initWithNibName:@"mapViewController" bundle:[NSBundle mainBundle]];

我可以直接调用MapViewController中的方法，又名

i can call methods in MapViewController directly, aka

[mapView testMethod];