Bring expression to your app with Genmoji

let textView = UITextView()
    textView.supportsAdaptiveImageGlyph = true

// Extract contents of text view as an attributed string
let textContents = textView.textStorage

// Serialize as data for storage or transport
let rtfData = try textContents.data(from: NSRange(location: 0, length: textContents.length),
              documentAttributes: [.documentType: NSAttributedString.DocumentType.rtfd])


// Create attributed string from serialized data
let textFromData = try NSAttributedString(data: rtfData, documentAttributes: nil)

// Set on text view
textView.textStorage.setAttributedString(textFromData)

// Decompose an attributed string

func decomposeAttributedString(_ attrStr: NSAttributedString) -> (String, [(NSRange, String)], [String: Data]) {
    let string = attrStr.string
    var imageRanges: [(NSRange, String)] = []
    var imageData: [String: Data] = [:]
    attrStr.enumerateAttribute(.adaptiveImageGlyph, in: NSMakeRange(0, attrStr.length)) { (value, range, stop) in
        if let glyph = value as? NSAdaptiveImageGlyph {
            let id = glyph.contentIdentifier
            imageRanges.append((range, id))
            if imageData[id] == nil {
                imageData[id] = glyph.imageContent
            }
        }
    }
    return (string, imageRanges, imageData)
}
    
// Recompose an attributed string

func recomposeAttributedString(string: String, imageRanges: [(NSRange, String)], imageData: [String: Data]) -> NSAttributedString {
    let attrStr: NSMutableAttributedString = .init(string: string)
    var images: [String: NSAdaptiveImageGlyph] = [:]
    for (id, data) in imageData {
        images[id] = NSAdaptiveImageGlyph(imageContent: data)
    }
    for (range, id) in imageRanges {
        attrStr.addAttribute(.adaptiveImageGlyph, value: images[id]!, range: range)
    }
    return attrStr
}

// Converting NSAttributedString to HTML

let htmlData = try textContent.data(from: NSRange(location: 0, length: textContent.length),
               documentAttributes: [.documentType: NSAttributedString.DocumentType.html])

func didReceive(_ request: UNNotificationRequest,
      withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {

  ...
  let message: NSAttributedString = _myAttributedMessageStringWithGlyph
  let context = UNNotificationAttributedMessageContext(sendMessageIntent: sendMessageIntent,
                                                       attributedContent: _message)    

  do {
    let messageContent = try request.content.updating(from: context)
    contentHandler(messageContent)
  } catch {
    // Handle error
  }
}

// Find typographic bounds for image in NSAdaptiveImageGlyph

let provider = adaptiveImageGlyph

let bounds = CTFontGetTypographicBoundsForAdaptiveImageProvider(font, provider)

// Draw it at the typographic origin point on the baseline

CTFontDrawImageFromAdaptiveImageProviderAtPoint(font, provider, point, context)