CODEWITHSUNDEEP
swiftencodeemoji
user7781428
user7781428

Reputation:

Swift Encode/decode emojis

I'm trying to encode and decode Emojis to send them to my database.

I use this to encode:

var comentario = String()
let data = Comment.data(using: String.Encoding.nonLossyASCII, allowLossyConversion: true)
if let data = data {
    let emojiString = NSString(data: data, encoding: String.Encoding.utf8.rawValue)! as String
    comentario = emojiString
}

And it works. But now I don't know how to decode the emoji.

This is the type of encode ---> \ud83d\ude1a

Upvotes: 7

Views: 14145

Answers (2)

Martin R
Martin R

Reputation: 539685

Your encoding code can be simplified to

func encode(_ s: String) -> String {
    let data = s.data(using: .nonLossyASCII, allowLossyConversion: true)!
    return String(data: data, encoding: .utf8)!
}

Note that it encodes all non-ASCII characters not only Emojis (as \uNNNN where NNNN is the hexadecimal code of the Unicode character, or as \NNN where NNN is an octal code). Decoding is done by reversing the transformations:

func decode(_ s: String) -> String? {
    let data = s.data(using: .utf8)!
    return String(data: data, encoding: .nonLossyASCII)
}

This returns an optional because it can fail for invalid input.

Example:

let s = "Hello 😃."
let e = encode(s)
print(e) // Hello \ud83d\ude03.

if let d = decode(e) {
    print(d) // Hello 😃.
}

Of course you can also define the code as extension methods of the String type, and you might want to choose better function names.

Upvotes: 29

user7781428
user7781428

Reputation:

I fixed this. If you have a server with encode utf8mb4, then for encoding emojis use this code:

var comentario = String()
let data = Comment.data(using: String.Encoding.nonLossyASCII, allowLossyConversion: true)
if let data = data {
    let emojiString = NSString(data: data, encoding: String.Encoding.utf8.rawValue)! as String
    comentario = emojiString
}// comentario contains the emoji encoded

DECODING:

let data = comentarios.data(using: String.Encoding.utf8, allowLossyConversion: false)

    if data != nil{
        let valueunicode = NSString(data: data!, encoding: String.Encoding.nonLossyASCII.rawValue) as? String

        if valueunicode != nil{
            comentarios = valueunicode!
        }
    }//comentarios contantes the deecode string(emoji)

Upvotes: 0

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