mastodon-ios/Mastodon/Scene/MediaPreview/AltViewController.swift

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Swift
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//
// AltViewController.swift
// Mastodon
//
// Created by Jed Fox on 2022-11-26.
//
import SwiftUI
class AltViewController: UIViewController {
let textView = {
let textView: UITextView
if #available(iOS 16, *) {
// TODO: update code below to use TextKit 2 when dropping iOS 15 support
textView = UITextView(usingTextLayoutManager: false)
} else {
textView = UITextView()
}
textView.textContainer.maximumNumberOfLines = 0
textView.textContainer.lineBreakMode = .byWordWrapping
textView.font = .preferredFont(forTextStyle: .callout)
textView.isScrollEnabled = true
textView.backgroundColor = .clear
textView.isOpaque = false
textView.isEditable = false
textView.tintColor = .white
textView.textContainerInset = UIEdgeInsets(top: 12, left: 8, bottom: 8, right: 8)
textView.contentInsetAdjustmentBehavior = .always
textView.verticalScrollIndicatorInsets.bottom = 4
return textView
}()
init(alt: String, sourceView: UIView?) {
textView.text = alt
super.init(nibName: nil, bundle: nil)
self.modalPresentationStyle = .popover
self.popoverPresentationController?.delegate = self
self.popoverPresentationController?.permittedArrowDirections = .up
self.popoverPresentationController?.sourceView = sourceView
self.overrideUserInterfaceStyle = .dark
}
@MainActor required dynamic init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
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override func loadView() {
super.loadView()
view.translatesAutoresizingMaskIntoConstraints = false
}
override func viewDidLoad() {
super.viewDidLoad()
textView.translatesAutoresizingMaskIntoConstraints = false
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view.backgroundColor = .systemBackground
view.addSubview(textView)
textView.pinToParent()
NSLayoutConstraint.activate([
textView.widthAnchor.constraint(lessThanOrEqualToConstant: 400),
])
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
UIView.performWithoutAnimation {
let size = textView.layoutManager.boundingRect(forGlyphRange: NSMakeRange(0, (textView.textStorage.string as NSString).length), in: textView.textContainer).size
preferredContentSize = CGSize(
width: size.width + (8 + textView.textContainer.lineFragmentPadding) * 2,
height: size.height + 12 + (textView.textContainer.lineFragmentPadding) * 2
)
}
}
override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
super.traitCollectionDidChange(previousTraitCollection)
textView.font = .preferredFont(forTextStyle: .callout)
}
}
// MARK: UIPopoverPresentationControllerDelegate
extension AltViewController: UIPopoverPresentationControllerDelegate {
func adaptivePresentationStyle(for controller: UIPresentationController, traitCollection: UITraitCollection) -> UIModalPresentationStyle {
.none
}
}