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

问题描述

我一直试图弄清楚如何在SwiftUI中使用Realm.问题在于SwiftUI和Realm都具有List类型.当您将SwiftUI导入到Realm模型中以使该类成为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在SwiftUI中成为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，这很简单，使用模块标识符作为前缀，如下所示:

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

let members = RealmSwift.List<Member>()

现在到您的问题的第二部分.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)
        })
    }
}

如果使用@ObjectBinding或@EnvironmentObject将DBData实例链接"到SwiftUI View，则UI将会刷新，并且posts的新值(在我们的示例中)将为底层领域每次更改时都可用.

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！