小编Big*_*gPP的帖子

我有这个 Getx 控制器用于从数据库读取帖子的内容：

class ReadSinglePostController extends GetxController {
  var isLoading = true.obs;
  var posts = Post(
          postID: 1,
          userID: 0,
          thumbnail: 'thumbnail',
          imageList: 'imageList',
          title: 'title',
          description: 'description',
          createdTime: DateTime.now())
      .obs; //yes this can be accessed

  var postid = 2.obs; //I want this value to change when I click a post in the UI

  @override
  void onInit() {
    super.onInit();
    readPost(postid);
  }

  updateID(var postID) {
    postid.value = postID;
    print('im print ${postid.value}');
  }//should update postid when a post is clicked in the …

现在我总是像这样使用 getx 可观察声明：

var someString = ''.obs;
var someNumber = 0.obs;

等等...

但是，如果某些变量一开始没有初始值，而我实际上希望它们为空然后更改它们呢？