find<S> method

S find<S>({ String? tag, })

Finds the registered type <S> (or tag) In case of using Get.create to register a type <S> or tag, it will create an instance each time you call find. If the registered type <S> (or tag) is a Controller, it will initialize it's lifecycle. 查找已注册的类型 <S> (或 tag) 如果使用 Get.create 注册类型 <S> 或 tag, 每次调用 find 时，它都会创建一个实例. 如果已注册的类型 <S> (或 tag) 是控制器，它将初始化其生命周期。

Implementation

S find<S>({String? tag}) {
  // 根据类型和 tag 生成唯一 key
  final key = _getKey(S, tag);
  // 如果已经注册过
  if (isRegistered<S>(tag: tag)) {
    // 取出对应的实例
    final dep = _singl[key];
    // 如果实例为空, 抛出异常
    if (dep == null) {
      if (tag == null) {
        throw 'Class "$S" is not registered';
      } else {
        throw 'Class "$S" with tag "$tag" is not registered';
      }
    }

    /// although dirty solution, the lifecycle starts inside
    /// `initDependencies`, so we have to return the instance from there
    /// to make it compatible with `Get.create()`.
    /// 虽然是 dirty 的解决方案，但生命周期是在  `initDependencies` 内部开始的,
    /// 因此我们必须从那里返回实例，以便使其与 `Get.create()` 兼容.
    final i = _initDependencies<S>(name: tag);
    return i ?? dep.getDependency() as S;
  } else {
    // 如果没有注册过, 抛出异常
    // ignore: lines_longer_than_80_chars
    throw '"$S" not found. You need to call "Get.put($S())" or "Get.lazyPut(()=>$S())"';
  }
}