/FixedTextField.swift Secret
Created
April 15, 2022 09:59
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import SwiftUI | |
extension TextField { | |
func fixed() -> some View { | |
hidden().overlay(FixedTextField(rootView: self)) | |
} | |
} | |
struct FixedTextField<Label: View>: UIViewControllerRepresentable { | |
let rootView: TextField<Label> | |
func makeUIViewController(context: Context) -> Controller { .init(rootView: rootView) } | |
func updateUIViewController(_ uiViewController: Controller, context: Context) {} | |
class Controller: UIHostingController<TextField<Label>> { | |
var text: String { | |
withUnsafeBytes(of: rootView) { $0.load(as: Binding<String>.self).wrappedValue } | |
} | |
var textField: UITextField? { view.subviews.first?.subviews.first as? UITextField } | |
override func viewWillLayoutSubviews() { | |
if let textField = textField, textField.text != text { textField.text = text } | |
super.viewWillLayoutSubviews() | |
} | |
} | |
} | |
struct FixedTextFieldStyle<Base: TextFieldStyle>: TextFieldStyle { | |
let base: Base | |
func _body(configuration: TextField<_Label>) -> some View { | |
configuration.fixed().textFieldStyle(base) | |
} | |
} | |
extension TextFieldStyle where Self == FixedTextFieldStyle<DefaultTextFieldStyle> { | |
static var fixed: Self { .init(base: .automatic) } | |
} | |
extension TextFieldStyle { | |
static func fixed<Base: TextFieldStyle>(_ base: Base) -> FixedTextFieldStyle<Base> | |
where Self == FixedTextFieldStyle<Base> { | |
.init(base: base) | |
} | |
} | |
struct ContentView: View { | |
@State var text = "" | |
var body: some View { | |
HStack { | |
TextField("Type here", text: Binding { text } set: { text = String($0.prefix(5)) }) | |
Text(text) | |
} | |
.padding() | |
.textFieldStyle(.fixed(.roundedBorder)) | |
} | |
} |
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