在SwiftUI中绑定到ForEach [英] Binding in a ForEach in SwiftUI

问题描述

我使用 FetchRequest 填充元素.然后，我使用一个列表，并想要显示某种待办事项元素，您可以在其中看到已选中的元素和未选中的元素.为此，我创建了一个CheckBoxView.

I use a FetchRequest to fill the elements. Then I'm using a list and want to display some kind of todo elements where you see which one is checked and which one not. Therefor I created a CheckBoxView.

我现在的问题是，我需要将绑定传递给视图.但是如何在ForEach中做到这一点?如果我有一个简单的绑定对我来说很容易，我只需生成一个 @State 即可.在这里怎么做?

My problem now is, that I need to pass a binding to the view. But how to do that in the ForEach? If I have a single binding its easy for me, I just generate a @State and it works. How to do it here?

List {
    ForEach(elements, id: \.self) { item in
        CheckBoxView(checked: item.checked)
    }
}

这是视图:

struct CheckBoxView: View {
    @Binding var checked: Bool
    ....
}

推荐答案

假设您的 elements 是items数组的状态，则可以是

Assuming your elements is state of items array, it can be

List {
    ForEach(elements.indices, id: \.self) { i in
        CheckBoxView(checked: $elements[i].checked)
    }
}

这篇关于在SwiftUI中绑定到ForEach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！