自定义文本字段上的 swiftui ios15 键盘回避问题

Question

重新发布此 Adjust View up with Keyboard show in SwiftUI 3.0 iOS15 中的问题.

SwiftUI 键盘回避不会显示整个文本字段，包括叠加层。

我已经尝试了很多与谷歌搜索不同的方法。
有人对此有任何解决方案吗？

struct ContentView: View {
    @State var text: String = ""
    var body: some View {
        ScrollView {
            VStack {
                Spacer(minLength: 600)
                TextField("Placeholder", text: $text)
                    .textFieldStyle(CustomTextFieldStyle())
            }
        }
    }
}

struct CustomTextFieldStyle: TextFieldStyle {
    func _body(configuration: TextField<Self._Label>) -> some View {
        configuration
            .padding(10)
            .overlay(
                RoundedRectangle(cornerRadius: 20)
                    .stroke(Color.red, lineWidth: 5)
            )
    }
}

Answer 1

您可以编写自定义 UITextFeild，其中 intrinsicContentSize 将被覆盖。

例子:

final class _UITextField: UITextField {
    override var intrinsicContentSize: CGSize {
        CGSize(width: UIView.noIntrinsicMetric, height: 56)
    }
}

然后，您可以使用 UIViewRepresentable 协议(protocol)和 UITextFieldDelegate 编写您自己的 TextField 实现:

struct _TextField: UIViewRepresentable {
    private let title: String?
    @Binding var text: String

    let textField = _UITextField()

    init(
        _ title: String?,
        text: Binding<String>
    ) {
        self.title = title
        self._text = text
    }

    func makeCoordinator() -> _TextFieldCoordinator {
        _TextFieldCoordinator(self)
    }

    func makeUIView(context: Context) -> _UITextField {
        textField.placeholder = title
        textField.delegate = context.coordinator
        return textField
    }

    func updateUIView(_ uiView: _UITextField, context: Context) {}
}

final class _TextFieldCoordinator: NSObject, UITextFieldDelegate {
    private let control: _TextField

    init(_ control: _TextField) {
        self.control = control
        super.init()
        control.textField.addTarget(self, action: #selector(textFieldEditingChanged), for: .editingChanged)
    }

    @objc private func textFieldEditingChanged(_ textField: UITextField) {
        control.text = textField.text ?? ""
    }
}