mastodon-app-ufficiale-ipho.../ShareActionExtension/Scene/View/StatusEditorView.swift

106 lines
3.0 KiB
Swift

//
// StatusEditorView.swift
//
//
// Created by MainasuK Cirno on 2021-7-16.
//
import UIKit
import SwiftUI
import UITextView_Placeholder
public struct StatusEditorView: UIViewRepresentable {
@Binding var string: String
let placeholder: String
let width: CGFloat
let attributedString: NSAttributedString
let keyboardType: UIKeyboardType
@Binding var viewDidAppear: Bool
public init(
string: Binding<String>,
placeholder: String,
width: CGFloat,
attributedString: NSAttributedString,
keyboardType: UIKeyboardType,
viewDidAppear: Binding<Bool>
) {
self._string = string
self.placeholder = placeholder
self.width = width
self.attributedString = attributedString
self.keyboardType = keyboardType
self._viewDidAppear = viewDidAppear
}
public func makeUIView(context: Context) -> UITextView {
let textView = UITextView(frame: .zero)
textView.placeholder = placeholder
textView.isScrollEnabled = false
textView.font = .preferredFont(forTextStyle: .body)
textView.textColor = .label
textView.keyboardType = keyboardType
textView.delegate = context.coordinator
textView.backgroundColor = .clear
textView.translatesAutoresizingMaskIntoConstraints = false
let widthLayoutConstraint = textView.widthAnchor.constraint(equalToConstant: 100)
widthLayoutConstraint.priority = .required - 1
context.coordinator.widthLayoutConstraint = widthLayoutConstraint
return textView
}
public func updateUIView(_ textView: UITextView, context: Context) {
// preserve currently selected text range to prevent cursor jump
let currentlySelectedRange = textView.selectedRange
// update content
// textView.attributedText = attributedString
textView.text = string
// update layout
context.coordinator.updateLayout(width: width)
// set becomeFirstResponder
if viewDidAppear {
viewDidAppear = false
textView.becomeFirstResponder()
}
// restore selected text range
textView.selectedRange = currentlySelectedRange
}
public func makeCoordinator() -> Coordinator {
Coordinator(self)
}
public class Coordinator: NSObject, UITextViewDelegate {
var parent: StatusEditorView
var widthLayoutConstraint: NSLayoutConstraint?
init(_ parent: StatusEditorView) {
self.parent = parent
}
public func textViewDidChange(_ textView: UITextView) {
// prevent break IME input
if textView.markedTextRange == nil {
parent.string = textView.text
}
}
func updateLayout(width: CGFloat) {
guard let widthLayoutConstraint = widthLayoutConstraint else { return }
widthLayoutConstraint.constant = width
widthLayoutConstraint.isActive = true
}
}
}