根据 SwiftUI 中的切换值更改文本

Question

我在 SwiftUI 中创建了一个带有文本、图像和导航按钮的视图。按下导航按钮时，它将导航到另一个包含 Toggle 的视图。当我更改 Toggle Value 时，我还想更改 Text 中的值以前的视图。

更改切换时值会更新，但在以前的视图中访问时未反映。

//BluetoothView.swift

struct BluetoothView: View {
    @ObjectBinding var bluetooth = Settings()

    var body: some View {
        return NavigationButton(destination: ToggleBluetoothView()) {
            HStack() {
                Image("default")
                    .resizable()
                    .cornerRadius(12)
                    .frame(width: 25, height: 25)
                    .clipped()
                    .aspectRatio(contentMode: .fit)
                Text("Bluetooth")
                    .color(.blue)
                    .font(.system(size: 18))
                Text(bluetooth.isBluetoothOn ? "On" : "Off")
                    .color(.gray)
                    .font(.subheadline)
                    .frame(width: 50, height: 40, alignment: .trailing)
            }
        }
    }
}

//ToggleBluetoothView.swift

struct ToggleBluetoothView: View {
    @ObjectBinding var bluetooth = Settings()

    var body: some View {
        Form {
            Section(header: Text("ENABLE TO CONNECT WITH NEARBY DEVICES")) {
                Toggle(isOn: $bluetooth.isBluetoothOn) {
                    Text("Bluetooth")
                    }
                }
            }
        }
    }

//Settings.swift

class Settings: BindableObject {

        var didChange = PassthroughSubject<Void, Never>()

       var isBluetoothOn = false { didSet { update() } }

        func update() {
            didChange.send(())
        }
    }

Answer 1

您在每个视图中分别实例化设置。两个视图都需要看到相同的设置对象：

更改以下内容：

NavigationButton(destination: ToggleBluetoothView(bluetooth: bluetooth)) { ... }

并移除 ToggleBluetoothView 中的初始值：

struct ToggleBluetoothView: View {
    @ObjectBinding var bluetooth: Settings

    var body: some View {
        Form {
            Section(header: Text("ENABLE TO CONNECT WITH NEARBY DEVICES")) {
                Toggle(isOn: $bluetooth.isBluetoothOn) {
                    Text("Bluetooth")
                }
            }
        }
    }
}