Impressia/Vernissage/Formatters/HTMLFotmattedText.swift

81 lines
2.9 KiB
Swift

//
// https://mczachurski.dev
// Copyright © 2022 Marcin Czachurski and the repository contributors.
// Licensed under the MIT License.
//
import UIKit
import SwiftUI
struct HTMLFormattedText: UIViewRepresentable {
let text: String
private let textView = UITextView()
private let fontSize: Int
private let width: Int
init(_ content: String, withFontSize fontSize: Int = 16, andWidth width: Int? = nil) {
self.text = content
self.fontSize = fontSize
self.width = width ?? Int(UIScreen.main.bounds.width) - 16
}
func makeUIView(context: UIViewRepresentableContext<Self>) -> UITextView {
textView.widthAnchor.constraint(equalToConstant: CGFloat(self.width)).isActive = true
textView.isSelectable = false
textView.isUserInteractionEnabled = false
textView.translatesAutoresizingMaskIntoConstraints = false
textView.isScrollEnabled = false
textView.backgroundColor = UIColor(.clear)
return textView
}
func updateUIView(_ uiView: UITextView, context: UIViewRepresentableContext<Self>) {
DispatchQueue.main.async {
if let attributeText = self.converHTML(text: text) {
textView.attributedText = attributeText
} else {
textView.text = ""
}
}
}
private func converHTML(text: String) -> NSAttributedString?{
guard let data = text.data(using: .utf16) else {
return nil
}
let largeAttributes = [
NSAttributedString.Key.font: UIFont.systemFont(ofSize: CGFloat(self.fontSize)),
NSAttributedString.Key.foregroundColor: UIColor(.mainTextColor)
]
let linkAttributes = [
NSAttributedString.Key.font: UIFont.systemFont(ofSize: CGFloat(self.fontSize)),
NSAttributedString.Key.foregroundColor: UIColor(.accentColor)
]
if let attributedString = try? NSMutableAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html], documentAttributes: nil) {
attributedString.enumerateAttributes(in: NSRange(0..<attributedString.length)) { value, range, stop in
attributedString.setAttributes(largeAttributes, range: range)
if value.keys.contains(NSAttributedString.Key.link) {
attributedString.setAttributes(linkAttributes, range: range)
}
}
return attributedString
} else{
return nil
}
}
}
struct HTMLFotmattedText_Previews: PreviewProvider {
static var previews: some View {
HTMLFormattedText("<p>Danish-made 1st class kebab</p><p>Say yes thanks to 2kg. delicious kebab, which is confused and cooked.</p><p>Yes thanks for 149.95</p><p>Now you can make the most delicious sandwiches, kebab mix and much more at home</p>")
}
}