如何在 SwiftUI 中使用 Realm [英] How to use Realm with SwiftUI

问题描述

我一直在研究如何在 SwiftUI 中使用 Realm.问题是 SwiftUI 和 Realm 都有一个 List 类型.当您将 SwiftUI 导入 Realm 模型以使类成为 BindableObject 并尝试创建 Realm List 属性时，会出现错误.

I have been trying to figure out how to use Realm with SwiftUI. The problem is that SwiftUI and Realm both have a List type. When you import SwiftUI into your Realm model to make the class a BindableObject and try to create a Realm List property there is an error.

是否可以使用 Realm 对象模型的实例并使其成为 SwiftUI 中的 BindableObject?

Is it possible to use an instance of the Realm object model and make it a BindableObject in SwiftUI?

推荐答案

当然，很简单，像这样使用模块标识符作为前缀:

Sure, it's very simple, use the module identifier as prefix like this :

let members = RealmSwift.List<Member>()

现在进入问题的第二部分.将 Realm 对象(或列表或结果集)封装在 BindableObject 中很容易:

Now to the second part of your question. It's easy to encapsulate a Realm object (or list, or resultset) in an BindableObject :

final class DBData: BindableObject  {

    let didChange = PassthroughSubject<DBData, Never>()

    private var notificationTokens: [NotificationToken] = []    
    var posts = Post.all

    init() {
        // Observe changes in the underlying model
        self.notificationTokens.append(posts.observe { _ in
            self.didChange.send(self)
        })

        self.notificationTokens.append(Message.all.observe { _ in
            self.didChange.send(self)
        })
    }
}

如果您使用 @ObjectBinding 或 @EnvironmentObject 将 DBData 实例链接"到 SwiftUI View> UI 将被刷新，并且 posts 的新值(在我们这里的示例中)将在每次基础领域发生变化时可用.

If you "link" a DBData instance to a SwiftUI View by either using @ObjectBinding or @EnvironmentObject the UI will be refreshed and the new value for posts (in our example here) will be available each time the underlying realm changes.

这篇关于如何在 SwiftUI 中使用 Realm的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！