如何修复 SwiftUI 中禁用的文本编辑器聚焦错误

Question

I think there's a bug that disabled text editor is focussed when I get in and out into another tab. I want to totally disable text editors but I don't know how. Seeing is believing.

struct TabViewWithTextEditor: View {
    var body: some View {
        TabView {
            TextEditors()
                .tabItem {
                    Image(systemName: "text.bubble")
                    Text("Text Editor")
                }
            
            AnotherView()
                .tabItem {
                    Image(systemName: "shippingbox")
                    Text("Empty View")
                }
        }
    }
}

struct TextEditors: View {
    @State var textA: String = "Hello World"
    @State var textB: String = "Placeholder"
    @State var enabled: Bool = true
    
    init() {
        UITextView.appearance().backgroundColor = .clear    // To apply background color.
    }
    
    var body: some View {
        VStack {
            Text("Text Editor")
            TextEditor(text: $textA)
                .background(enabled ? .gray : .red)
                .foregroundColor(.black)
                .disabled(!enabled)
            TextEditor(text: $textB)
                .background(enabled ? .yellow : .red)
                .foregroundColor(.black)
                .disabled(!enabled)
            Toggle("Enable Text Editors", isOn: $enabled)
        }
        .padding(30)
    }
}

struct AnotherView: View {
    var body: some View {
        Text("Empty View")
    }
}

And it looks like

Answer 1

It looks like the issue is due to TextEditor (or UITextView at backend) preserves focus, probably due to a bug.

Here is safe workaround - remove focus forcefully before disable

Tested with Xcode 13.4 / iOS 15.5

@FocusState private var focused: Bool

var isEditing: Binding<Bool> {
    Binding(get: { enabled } , set: {
        if !$0 {
            focused = false      // << here !!
        }
        enabled = $0
    })
}

// ...

Toggle("Enable Text Editors", isOn: isEditing)