ios - Swift HTML Decoding Trouble

Question

In Swift, I Decoding HTML using NSAttributedString, see below:

let encodedString = "Ph?i c?ng nh?n r?ng k? t? lúc ?ng Th?ng?làm b? tr??ng"
let encodedData = encodedString.dataUsingEncoding(NSUTF8StringEncoding)
let attributedOptions = [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType]
let attributedString = NSAttributedString(data: encodedData, options: attributedOptions, documentAttributes: nil, error: nil)         
let decodedString = attributedString.string
println(decodedString)

But the result like this:

Pháo￡i c?′ng nháo-n ráo±ng ká?? tá?? l?oc ?′ng Th??ng??l??m bá?? tr?°á??ng

The true result must be the same with the encodedString

What's wrong in this method?

Answer 1

You have to specify the used character encoding in the document options:

let encodedString = "Ph?i c?ng nh?n r?ng k? t? lúc ?ng Th?ng làm b? tr??ng"
let encodedData = encodedString.data(using: .utf8)!

let attributedOptions : [NSAttributedString.DocumentReadingOptionKey : Any ] = [
    .documentType: NSAttributedString.DocumentType.html,
    .characterEncoding: String.Encoding.utf8.rawValue ]
do {
    let attributedString = try NSAttributedString(data: encodedData, options: attributedOptions, documentAttributes: nil)
    let decodedString = attributedString.string
    print(decodedString)
} catch {
    // error ...
}

// Output: Ph?i c?ng nh?n r?ng k? t? lúc ?ng Th?ng làm b? tr??ng

(Updated for Swift 4)