android - 每次如何在koin中创建viewModel的新实例

Question

我正在使用 科因 作为 依赖注入(inject)模式 在我的项目中，每当我加载 fragment/Activity 时，我都需要创建新实例，现在使用以下模式，任何解决方案都可以节省大量时间。

private val homeViewModel: HomeViewModel by viewModel()

Answer 1

Define ViewModel as an abstract in BaseFragment class and set value when you extend your BaseFragment.

abstract class BaseFragment<Binding : ViewDataBinding, ViewModel : BaseViewModel> : Fragment(){
            protected var bindingObject: Binding? = null
            protected abstract val mViewModel: ViewModel

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
            bindingObject = DataBindingUtil.inflate(inflater, getLayoutResId(), container, false)
            return bindingObject?.root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        performDataBinding()
    }

    @LayoutRes
    abstract fun getLayoutResId(): Int

    private fun performDataBinding() {
        bindingObject?.setLifecycleOwner(this)
        bindingObject?.setVariable(BR.viewModel, mViewModel)
        bindingObject?.executePendingBindings()
    }

}

And in your fragment

    class FragmentNew : BaseFragment<FragmentNewBinding, FragmentNewVM>() {
       // Here is the your viewmodel imlementation. Thus when you create fragment it's by default override method
       override val mViewModel: FragmentNewVM by viewModel() 

       override fun getLayoutResId(): Int = [fragment layout id like "R.layout.fragment_new"]
   }