SwiftUI TextEditor 滚动显示键盘不起作用

Question

我有一个带有 SwiftUI 生命周期的 SwiftUI 应用程序，它使用 TextFields 和 文本编辑器。我写了一个修饰符来处理滚动内容 当键盘存在时，位于键盘下方。我的修改器按预期工作 对于 TextFields，但对于 TextEditors 则完全没有。苹果文档说 keyboardWillShowNotification 是 在键盘显示之前立即发布。我找不到任何东西 声明通知仅限于文本字段。两种字段类型都在同一个 ScrollView 中。希望我失踪了 这里有一些简单的东西。

我的修饰符：

struct AdaptsToSoftwareKeyboard: ViewModifier {

    @State var currentHeight: CGFloat = 0

    func body(content: Content) -> some View {
        content
            .padding(.bottom, self.currentHeight)
            .edgesIgnoringSafeArea(self.currentHeight == 0 ? Edge.Set() : .bottom)
            .onAppear(perform: subscribeToKeyboardEvents)
    }

    private let keyboardWillOpen = NotificationCenter.default
        .publisher(for: UIResponder.keyboardWillShowNotification)
        .map { $0.userInfo![UIResponder.keyboardFrameEndUserInfoKey] as! CGRect }
        .map { $0.height }

    private let keyboardWillHide =  NotificationCenter.default
        .publisher(for: UIResponder.keyboardWillHideNotification)
        .map { _ in CGFloat.zero }

    private func subscribeToKeyboardEvents() {
        _ = Publishers.Merge(keyboardWillOpen, keyboardWillHide)
            .subscribe(on: RunLoop.main)
            .assign(to: \.self.currentHeight, on: self)
    }
}

任何指导将不胜感激。 Xcode 版本 12.2 测试版 (12B5018i) iOS 14

第一次编辑：我认为问题可能是当 TextEditor 收到焦点时无法收到通知。但是，将此修饰符添加到 TextEditor 会显示已触发通知。没有进展：

   .onReceive(NotificationCenter.default.publisher(for: UIApplication.keyboardWillShowNotification)) { _ in
        print("Cursor is in TextEditor!")
    }

Answer 1

我假设您应该将订阅者存储如下

struct AdaptsToSoftwareKeyboard: ViewModifier {

    @State var currentHeight: CGFloat = 0
    @State private var cancelable: AnyCancellable?
    
    func body(content: Content) -> some View {
        content
            .padding(.bottom, self.currentHeight)
            .edgesIgnoringSafeArea(self.currentHeight == 0 ? Edge.Set() : .bottom)
            .onAppear(perform: subscribeToKeyboardEvents)
    }

    private let keyboardWillOpen = NotificationCenter.default
        .publisher(for: UIResponder.keyboardWillShowNotification)
        .map { $0.userInfo![UIResponder.keyboardFrameEndUserInfoKey] as! CGRect }
        .map { $0.height }

    private let keyboardWillHide =  NotificationCenter.default
        .publisher(for: UIResponder.keyboardWillHideNotification)
        .map { _ in CGFloat.zero }

    private func subscribeToKeyboardEvents() {
        self.cancelable = Publishers.Merge(keyboardWillOpen, keyboardWillHide)
            .subscribe(on: RunLoop.main)
            .assign(to: \.self.currentHeight, on: self)
    }
}