如何通过绑定来传递取回
如何将绘制绘制＆lt; cditem＆gt;作为绑定到内视图，以避免在外部更改上重新创建内部视图？
简单示例：
struct CollectionView: UIViewRepresentable {
@Binding
var items: [Item] // array of structs which are core data entities representation
...
}
struct ItemsView: View {
@FetchRequest(fetchRequest: CDItem.fetchReuqest)
var items: FetchedResults<CDItem>
var body: some View {
CollectionView(items: /* ??? */)
}
}
我有第一个想法 - 使用nsfetchedResultSconTroller进行一些observableObject内部，然后更新一些@published变量，nsfetchedResultscontrollerDelelerDelegate@fetchrequest之类的糖
How to map and pass FetchedResults<CDItem> as Binding to inner view which is UIKit wrapper to avoid recreating inner view on outside changes?
Simple sample:
struct CollectionView: UIViewRepresentable {
@Binding
var items: [Item] // array of structs which are core data entities representation
...
}
struct ItemsView: View {
@FetchRequest(fetchRequest: CDItem.fetchReuqest)
var items: FetchedResults<CDItem>
var body: some View {
CollectionView(items: /* ??? */)
}
}
First idea I had - make some ObservableObject with NSFetchedResultsController inside and update some @Published variable with NSFetchedResultsControllerDelegate and then use easy way to convert it to Binding. But I would like to use such sugar as @FetchRequest
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（1）
@binding根据定义，双向连接@fetchrequest和nsfetchedResultScontroller不是双向。如果您需要从商店使用
项目使用，或者
您正在抽象。
影响
@fetchrequest和nsfetchedresultscontroller的唯一方法是对商店进行更改。他们总是在听。@Bindingis by definition a two-way connection@FetchRequestandNSFetchedResultsControllerare not two-way.If you need to pass around
itemsfrom the store useor
If you are abstracting.
The only way to affect
@FetchRequestandNSFetchedResultsControlleris to make changes to the store. They are always listening.