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PostTitleTextView.swift
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PostTitleTextView.swift
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// Based on https://lostmoa.com/blog/DynamicHeightForTextFieldInSwiftUI and https://stackoverflow.com/a/56508132
import SwiftUI
class PostTitleCoordinator: NSObject, UITextViewDelegate, NSLayoutManagerDelegate {
@Binding var text: String
@Binding var isFirstResponder: Bool
var lineSpacingMultiplier: CGFloat
var didBecomeFirstResponder: Bool = false
var postTitleTextView: PostTitleTextView
weak var textView: UITextView?
init(
_ textView: PostTitleTextView,
text: Binding<String>,
isFirstResponder: Binding<Bool>,
lineSpacingMultiplier: CGFloat
) {
self.postTitleTextView = textView
_text = text
_isFirstResponder = isFirstResponder
self.lineSpacingMultiplier = lineSpacingMultiplier
}
func textViewDidChange(_ textView: UITextView) {
DispatchQueue.main.async {
self.postTitleTextView.text = textView.text ?? ""
}
}
func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
if text == "\n" {
self.isFirstResponder.toggle()
self.didBecomeFirstResponder = false
return false
}
return true
}
func layoutManager(
_ layoutManager: NSLayoutManager,
didCompleteLayoutFor textContainer: NSTextContainer?,
atEnd layoutFinishedFlag: Bool
) {
DispatchQueue.main.async {
guard let view = self.textView else { return }
let size = view.sizeThatFits(view.bounds.size)
if self.postTitleTextView.height != size.height {
self.postTitleTextView.height = size.height
}
}
}
func layoutManager(
_ layoutManager: NSLayoutManager,
lineSpacingAfterGlyphAt glyphIndex: Int,
withProposedLineFragmentRect rect: CGRect
) -> CGFloat {
// HACK: - This seems to be the only way to get line spacing to update dynamically on iPad
// when switching between full-screen, split-screen, and slide-over views.
if let window = UIApplication.shared.windows.filter({ $0.isKeyWindow }).first {
// Get the width of the window to determine the size class
if window.frame.width < 600 {
// Use 0.25 multiplier for compact size class
return 17 * 0.25
} else {
// Use 0.5 multiplier otherwise
return 17 * 0.5
}
} else {
return 17 * lineSpacingMultiplier
}
}
}
struct PostTitleTextView: UIViewRepresentable {
@Binding var text: String
@Binding var textStyle: UIFont
@Binding var height: CGFloat
@Binding var isFirstResponder: Bool
@State var lineSpacing: CGFloat
func makeUIView(context: UIViewRepresentableContext<PostTitleTextView>) -> UITextView {
let textView = UITextView()
textView.isEditable = true
textView.isUserInteractionEnabled = true
textView.isScrollEnabled = false
textView.alwaysBounceVertical = false
context.coordinator.textView = textView
textView.delegate = context.coordinator
textView.layoutManager.delegate = context.coordinator
let font = textStyle
let fontMetrics = UIFontMetrics(forTextStyle: .largeTitle)
textView.font = fontMetrics.scaledFont(for: font)
textView.backgroundColor = UIColor.clear
return textView
}
func makeCoordinator() -> PostTitleCoordinator {
return Coordinator(
self,
text: $text,
isFirstResponder: $isFirstResponder,
lineSpacingMultiplier: lineSpacing
)
}
func updateUIView(_ uiView: UITextView, context: UIViewRepresentableContext<PostTitleTextView>) {
if uiView.text != text {
uiView.text = text
}
let font = textStyle
let fontMetrics = UIFontMetrics(forTextStyle: .largeTitle)
uiView.font = fontMetrics.scaledFont(for: font)
// We don't want the text field to become first responder every time SwiftUI refreshes the view.
if isFirstResponder && !context.coordinator.didBecomeFirstResponder {
uiView.becomeFirstResponder()
context.coordinator.didBecomeFirstResponder = true
}
}
}

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