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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/56508132/1234545
import SwiftUI
class PostTitleCoordinator: NSObject, UITextViewDelegate, NSLayoutManagerDelegate {
@Binding var text: String
@Binding var isFirstResponder: Bool
var didBecomeFirstResponder: Bool = false
var postTitleTextView: PostTitleTextView
weak var textView: UITextView?
init(_ textView: PostTitleTextView, text: Binding<String>, isFirstResponder: Binding<Bool>) {
self.postTitleTextView = textView
_text = text
_isFirstResponder = isFirstResponder
}
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()
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
}
}
}
}
struct PostTitleTextView: UIViewRepresentable {
@Binding var text: String
@Binding var textStyle: UIFont
@Binding var height: CGFloat
@Binding var isFirstResponder: Bool
func makeUIView(context: UIViewRepresentableContext<PostTitleTextView>) -> UITextView {
let textView = UITextView()
textView.isEditable = true
textView.isUserInteractionEnabled = true
textView.isScrollEnabled = true
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)
}
func updateUIView(_ uiView: UITextView, context: UIViewRepresentableContext<PostTitleTextView>) {
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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