How to convert AttributedString to NSMutableString Swift? - swift

Question

I have HTML and was converted to AttributedString. Now, I need to change the generated Attributed string's font but I'm having a hard time retaining the style(Bold, Italic or Regular).
I found a solution but the problem is I don't know how to use it. They using NSMutableAttributedString as extension. I pasted my code how did I convert and the supposed solution at the bottom.
Thank you.
extension String {
var htmlToAttributedString: NSAttributedString? {
guard let data = data(using: .utf8) else { return NSAttributedString() }
do {
return try NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding:String.Encoding.utf8.rawValue], documentAttributes: nil)
} catch {
return NSAttributedString()
}
}
}
import Foundation
struct Service: Codable {
var id: Int
var name: String?
var price: String?
var description: String?
var subtitle: String?
var bodyPreview: String?
var featuredImage: String? // For FindAll
var imageList: [String]? // For FindByID
private enum CodingKeys: String, CodingKey {
case id
case name
case price
case subtitle
case description
case bodyPreview = "body_preview"
case featuredImage = "featured_image_url"
case imageList = "images_url"
}
}
class ServiceDetailViewController: UIViewController {
private var service: Service?
private func showServiceDetails() {
detailLabel.attributedText = service?.description?.htmlToAttributedString
collectionView.reloadData()
startCollectionViewTimer()
}
}
Manmal's solution:
extension NSMutableAttributedString {
func setFontFace(font: UIFont, color: UIColor? = nil) {
beginEditing()
self.enumerateAttribute(
.font,
in: NSRange(location: 0, length: self.length)
) { (value, range, stop) in
if let f = value as? UIFont,
let newFontDescriptor = f.fontDescriptor
.withFamily(font.familyName)
.withSymbolicTraits(f.fontDescriptor.symbolicTraits) {
let newFont = UIFont(
descriptor: newFontDescriptor,
size: font.pointSize
)
removeAttribute(.font, range: range)
addAttribute(.font, value: newFont, range: range)
if let color = color {
removeAttribute(
.foregroundColor,
range: range
)
addAttribute(
.foregroundColor,
value: color,
range: range
)
}
}
}
endEditing()
}
}

Answer 1

let attriString = NSAttributedString(string:"attriString", attributes:
[NSAttributedString.Key.foregroundColor: UIColor.lightGray,
NSAttributedString.Key.font: AttriFont])

Answer 2

You can simply create a similar extension to return a mutable attributed string:
extension String {
var htmlToMutableAttributedString: NSMutableAttributedString? {
do {
return try .init(data: Data(utf8), options: [.documentType: NSAttributedString.DocumentType.html, .characterEncoding: String.Encoding.utf8.rawValue], documentAttributes: nil)
} catch {
print(error)
return nil
}
}
}