在SwiftUI列表中从Realm呈现数据的正确方法是什么 [英] What is the right way to present data from Realm in SwiftUI List

问题描述

我正在尝试从 Realm 中获取所有项目，并将它们显示在 SwiftUI列表中，但是我一直遇到错误.

I’m trying to fetch all of the items from Realm and display them in a SwiftUI List but I keep getting an error.

在 UIKit/Realm 应用程序中，我将创建一个 Results 变量来存储 Realm 中的所有项目，然后，在 viewDidLoad 方法中获取项目并将其分配给变量.我正在尝试在 SwiftUI 中执行相同的操作，但是我不确定如何构建代码，我不断收到一条错误消息，指出我的 Realm 模型应符合 StringProtocol ，我很确定这与我对 SwiftUI 中的 Binding 缺乏了解有关.

In a UIKit/Realm application, I would just create a Results variable to store all of the items from Realm then, I would fetch items in the viewDidLoad method and assign them to the variable. I'm trying to do the same thing in SwiftUI but I'm not sure how to structure my code, I keep getting an error saying that my Realm model should conform to the StringProtocol, I'm pretty sure this has to do with my lack of understanding Binding in SwiftUI.

同样，我要做的就是从 Realm 获取所有项目，并将它们显示在 SwiftUI列表中.

Again, all I’m trying to do is fetch all of the items from Realm and display them in a SwiftUI List.

这就是我所拥有的.

class User:Object{
    @objc dynamic var name:String = ""
    @objc dynamic var age:Int = 0
    @objc dynamic var createdAt = NSDate()

    @objc dynamic var userID = UUID().uuidString
    override static func primaryKey() -> String? {
        return "userID"
    }
}

SwiftUI代码:

struct ContentView: View {
    @State private var allUsers : Results<User>!
    var body: some View {
        VStack{
            List{
                ForEach(allUsers, id:\.self) { user in
                    Text(user) // the error points here
                }
            }
        }.onAppear(){
            self.updateUserResults()
        }
    }
    func updateUserResults(){
        allUsers = realm.objects(User.self)
    }
}

错误:

初始化器'init(_ :)'要求'用户'符合'StringProtocol'

Initializer 'init(_:)' requires that 'User' conform to 'StringProtocol'

我想念什么?

推荐答案

可能你是这个意思

ForEach(allUsers, id:\.self) { user in
    Text(user.name)
}

这篇关于在SwiftUI列表中从Realm呈现数据的正确方法是什么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！