Question

我有五个不同颜色的圆圈，每个圆圈都在相同的功能中调用，但具有不同的物理实体和名称。我希望他们都能从屏幕底部向上移动，屏幕上只有一个节点，一次从一个设置位置（即CGPointMake（100，-500））就像生成一个随机颜色的节点后，4秒会出现一个不同的随机选择的？

有没有办法让所有人都被单独识别并执行此操作？

代码：

      func circles() {

     let sprites = SKSpriteNode(imageNamed: "Circle1")
       sprites.position = CGPointMake(45, -200)

        sprites.physicsBody = SKPhysicsBody(circleOfRadius: 40)
        sprites.physicsBody?.dynamic = true
        sprites.physicsBody?.affectedByGravity = false
        sprites.physicsBody?.categoryBitMask = BodyType.player.rawValue
        sprites.physicsBody?.contactTestBitMask = BodyType.enemy.rawValue | BodyType.other.rawValue | BodyType.seven.rawValue | BodyType.nine.rawValue | BodyType.five.rawValue

        sprites.size = CGSizeMake(45, 45)
        all.addChild(sprites)
        let sprite2 = SKSpriteNode(imageNamed: "Circle2")
        sprite2.position = CGPointMake(60, -750)
        sprite2.physicsBody = SKPhysicsBody(circleOfRadius: 40)
        sprite2.physicsBody?.categoryBitMask = BodyType.eight.rawValue
        sprite2.physicsBody?.contactTestBitMask = BodyType.nine.rawValue | BodyType.other.rawValue | BodyType.five.rawValue | BodyType.enemy.rawValue | BodyType.seven.rawValue
        sprite2.physicsBody?.dynamic = true
        sprite2.physicsBody?.affectedByGravity = false

        sprite2.size = CGSizeMake(45, 45)
         addChild(sprite2)
        let sprite3 = SKSpriteNode(imageNamed: "circle3")
        sprite3.position = CGPointMake(100, -1200)
        sprite3.physicsBody = SKPhysicsBody(circleOfRadius: 40)
        sprite3.physicsBody?.categoryBitMask = BodyType.six.rawValue
        sprite3.physicsBody?.contactTestBitMask = BodyType.seven.rawValue | BodyType.other.rawValue | BodyType.five.rawValue | BodyType.enemy.rawValue | BodyType.nine.rawValue
        sprite3.physicsBody?.dynamic = true
        sprite3.physicsBody?.affectedByGravity = false

        sprite3.size = CGSizeMake(45, 45)
        addChild(sprite3)
        let sprite4 = SKSpriteNode(imageNamed: "Circle4")
        sprite4.position = CGPointMake(150, -1400)
        sprite4.physicsBody = SKPhysicsBody(circleOfRadius: 40)
        sprite4.physicsBody?.categoryBitMask = BodyType.ground.rawValue
        sprite4.physicsBody?.contactTestBitMask = BodyType.other.rawValue | BodyType.player.rawValue | BodyType.five.rawValue | BodyType.enemy.rawValue | BodyType.seven.rawValue
        sprite4.physicsBody?.dynamic = true
        sprite4.physicsBody?.affectedByGravity = false

        sprite4.size = CGSizeMake(45, 45)
        addChild(sprite4)
        let sprite5 = SKSpriteNode(imageNamed: "Circle5")
        sprite5.position = CGPointMake(200, -850)
        sprite5.physicsBody = SKPhysicsBody(circleOfRadius: 40)
        sprite5.physicsBody?.categoryBitMask = BodyType.ya.rawValue
        sprite5.physicsBody?.contactTestBitMask = BodyType.five.rawValue | BodyType.player.rawValue | BodyType.other.rawValue | BodyType.seven.rawValue | BodyType.nine.rawValue


        sprite5.physicsBody?.dynamic = true
        sprite5.physicsBody?.affectedByGravity = false
        sprite5.size = CGSizeMake(45, 45)
        addChild(sprite5)
          }

非常感谢。

Answer 1

您可以使用public class PodcastListFragment extends Fragment { private View view; private SwipeRefreshLayout refreshLayout; private ListView listView; private int channelId; private ArrayAdapter adapter; private ArrayList<Podcast>podcastList = new ArrayList<Podcast>() @Nullable @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { view = inflater.inflate(R.layout.podcast_list_fragment,container,false); adapter = new PodcastListAdapter(getActivity(),podcastList); listView = (ListView)view.findViewById(R.id.listview_podcast_list); listView.setAdapter(adapter); TextView textView = (TextView)view.findViewById(R.id.list_title); textView.setText(getArguments().getString("title")); this.channelId = getArguments().getInt("channel"); updateListItems(); return view; } private void updateListItems() { String url = getResources().getString(R.string.api_endpoint)+"podcast"; if(channelId>0) { url = url + "?channel="+String.valueOf(channelId); } JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(url, null, new Response.Listener<JSONObject>() { @Override public void onResponse(JSONObject response) { try{ String status = response.getString("status"); if(status.equals(getResources().getString(R.string.success))) { JSONArray items = response.getJSONArray("items"); ArrayList<Podcast> podcasts = new ArrayList<Podcast>(); if(items.length()>0) { for(int i=0;i<items.length();i++) { Podcast podcast = Podcast.fromJsonObject(items.getJSONObject(i)); podcasts.add(podcast); } } podcastList.addAll(podcasts); adapter.notifyDataSetChanged(); } } catch (JSONException e) { Toast.makeText(getActivity().getBaseContext(),"Error encountered in transferring data from server",Toast.LENGTH_SHORT).show(); } } }, new Response.ErrorListener() { @Override public void onErrorResponse(VolleyError error) { Toast.makeText(getActivity().getBaseContext(),"Error encountered in transferring data from server",Toast.LENGTH_SHORT).show(); } }); MySingleton.getInstance(getActivity()).addToRequestQueue(jsonObjectRequest); } }的名称属性。

来自documentation：

用于为节点指定名称以供以后参考。选择时对于节点的名称，您应该确定每个节点是否都是唯一的名称或某些节点是否共享公用名。如果你给节点一个唯一的名称，您可以稍后通过调用找到该节点 childNodeWithName：方法。如果名称由多个节点共享，则 name通常意味着这些都是你的类似对象类型游戏。在这种情况下，您可以通过调用来迭代这些对象 enumerateChildNodesWithName：usingBlock：method。

如何在一个位置随机选择一个节点？

1 个答案: