Ios SCeneKit处理三维模型每个部分上的点击手势

当我像这样加载节点时

SCNScene *scene = [SCNScene sceneNamed:@"art.scnassets/ship.dae"];

我怎样才能控制机翼上的水龙头以及我想要的计划的每一部分？因为处理点击手势只允许我获取节点

// add a tap gesture recognizer
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
NSMutableArray *gestureRecognizers = [NSMutableArray array];
[gestureRecognizers addObject:tapGesture];
[gestureRecognizers addObjectsFromArray:scnView.gestureRecognizers];
scnView.gestureRecognizers = gestureRecognizers;

我想在模型的每个部分都添加点击手势，我该怎么做