Question

我已经找到了满足我需求的几乎完美的代码。但是有一个问题：

我想在每行中使用切换按钮而不是按钮。

@kontiki在此处发布的原始代码：SwiftUI hide list item from list item view

import SwiftUI

struct Item: Identifiable {
    let id = UUID()
    var isComplete: Bool = false
}

class Model: ObservableObject {
    @Published var isOn: Bool = false
    @Published var arr = [Item(isComplete: true), Item(isComplete: false), Item(isComplete: true), Item(isComplete: false), Item(isComplete: true), Item(isComplete: true)]
}

struct ContentView: View {
    @ObservedObject var model = Model()

    var body: some View {
        List {

            Toggle(isOn: $model.isOn) { Text("Toggle") }

            ForEach(self.model.arr.filter { model.isOn ? true : $0.isComplete }) { item in
                Row(item: item, model: self.model)
            }
        }
    }
}

struct Row: View {
    let item: Item
    @ObservedObject var model: Model

    var body: some View {
        HStack {

            Button(action: {

                if let idx = self.model.arr.firstIndex(where: { $0.id == self.item.id }) {
                    self.model.arr[idx].isComplete.toggle()
                    self.model.isOn = false
                }

            }) {

                Text("Button")

            }

            Text(item.isComplete ? "Complete" : "Not complete")

        }
    }
}

我尝试使用像这样的切换来代替按钮：

Toggle(isOn: $item.isComplete) {
                Text("Done")
            }

按钮内有我不理解的if语句。我也尝试过在按钮之外使用这个let idx声明，以使其更易于使用切换（因为我不知道如何进行这种复杂的切换），但这也失败了。

Answer 1

注意：列表中的Toggle控件更新存在已知问题。请注意。详细信息在Problems with layout of some rows in SwiftUI list主题中。

这是可行的方法。修改过的行在注释中标记。

import SwiftUI

struct Item: Identifiable, Equatable { // <<
    let id = UUID()
    var isComplete: Bool = false
}

class Model: ObservableObject {
    @Published var isOn: Bool = false
    @Published var arr = [Item(isComplete: true), Item(isComplete: false), Item(isComplete: true), Item(isComplete: false), Item(isComplete: true), Item(isComplete: true)]
}

struct ContentView: View {
    @ObservedObject var model = Model()

    var body: some View {
        List {

            Toggle(isOn: $model.isOn) { Text("Toggle") }

            ForEach(self.model.arr.filter { model.isOn ? true : $0.isComplete }) { item in
                Row(item: self.$model.arr[self.model.arr.firstIndex(of: item)!]) // <<
            }
        }
    }
}

struct Row: View {
    @Binding var item: Item // <<

    var body: some View {
        HStack {
            Toggle(isOn: $item.isComplete) {
                Text("Done")
            }
            Text(item.isComplete ? "Complete" : "Not complete")

        }
    }
}

SwiftUI-使用Toggle隐藏列表项

1 个答案: