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MultilineTextView.swift
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MultilineTextView.swift
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// Credit: https://stackoverflow.com/a/58639072
import SwiftUI
import UIKit
private struct UITextViewWrapper: UIViewRepresentable {
typealias UIViewType = UITextView
@Binding var text: String
@Binding var calculatedHeight: CGFloat
@Binding var isEditing: Bool
var textStyle: UIFont
var onDone: (() -> Void)?
func makeUIView(context: UIViewRepresentableContext<UITextViewWrapper>) -> UITextView {
let textField = UITextView()
textField.delegate = context.coordinator
textField.isEditable = true
textField.font = UIFont.preferredFont(forTextStyle: .body)
textField.isSelectable = true
textField.isUserInteractionEnabled = true
textField.isScrollEnabled = false
textField.backgroundColor = UIColor.clear
textField.smartDashesType = .no
let font = textStyle
let fontMetrics = UIFontMetrics(forTextStyle: .largeTitle)
textField.font = fontMetrics.scaledFont(for: font)
if nil != onDone {
textField.returnKeyType = .next
}
textField.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
return textField
}
func updateUIView(_ uiView: UITextView, context: UIViewRepresentableContext<UITextViewWrapper>) {
if uiView.text != self.text {
uiView.text = self.text
}
if uiView.window != nil && isEditing {
DispatchQueue.main.async {
uiView.becomeFirstResponder()
}
}
UITextViewWrapper.recalculateHeight(view: uiView, result: $calculatedHeight)
}
fileprivate static func recalculateHeight(view: UIView, result: Binding<CGFloat>) {
let newSize = view.sizeThatFits(CGSize(width: view.frame.size.width, height: CGFloat.greatestFiniteMagnitude))
if result.wrappedValue != newSize.height {
DispatchQueue.main.async {
result.wrappedValue = newSize.height // !! must be called asynchronously
}
}
}
func makeCoordinator() -> Coordinator {
return Coordinator(text: $text, height: $calculatedHeight, isFirstResponder: $isEditing, onDone: onDone)
}
final class Coordinator: NSObject, UITextViewDelegate {
@Binding var isFirstResponder: Bool
var text: Binding<String>
var calculatedHeight: Binding<CGFloat>
var onDone: (() -> Void)?
init(
text: Binding<String>,
height: Binding<CGFloat>,
isFirstResponder: Binding<Bool>,
onDone: (() -> Void)? = nil
) {
self.text = text
self.calculatedHeight = height
self._isFirstResponder = isFirstResponder
self.onDone = onDone
}
func textViewDidChange(_ uiView: UITextView) {
text.wrappedValue = uiView.text
UITextViewWrapper.recalculateHeight(view: uiView, result: calculatedHeight)
}
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
if let onDone = self.onDone, text == "\n" {
textView.resignFirstResponder()
onDone()
return false
}
return true
}
func textViewDidEndEditing(_ textView: UITextView) {
self.isFirstResponder = false
}
}
}
struct MultilineTextField: View {
private var placeholder: String
private var textStyle: UIFont
private var onCommit: (() -> Void)?
@Binding var isFirstResponder: Bool
@Binding private var text: String
private var internalText: Binding<String> {
Binding<String>(get: { self.text }) { // swiftlint:disable:this multiple_closures_with_trailing_closure
self.text = $0
self.showingPlaceholder = $0.isEmpty
}
}
@State private var dynamicHeight: CGFloat = 100
@State private var showingPlaceholder = false
init (
_ placeholder: String = "",
text: Binding<String>,
font: UIFont,
isFirstResponder: Binding<Bool>,
onCommit: (() -> Void)? = nil
) {
self.placeholder = placeholder
self.onCommit = onCommit
self.textStyle = font
self._isFirstResponder = isFirstResponder
self._text = text
self._showingPlaceholder = State<Bool>(initialValue: self.text.isEmpty)
}
var body: some View {
UITextViewWrapper(
text: self.internalText,
calculatedHeight: $dynamicHeight,
isEditing: $isFirstResponder,
textStyle: textStyle,
onDone: onCommit
)
.frame(minHeight: dynamicHeight, maxHeight: dynamicHeight)
.background(placeholderView, alignment: .topLeading)
}
var placeholderView: some View {
Group {
if showingPlaceholder {
let font = Font(textStyle)
Text(placeholder).foregroundColor(.gray)
.padding(.leading, 4)
.padding(.top, 8)
.font(font)
}
}
}
}

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