带有表情符号的文本未解码 - iOS Swift

Question

I have used the following code to encode/decode the string which has emojis.

extension String {
    func encodeEmoji() -> String {
        let data = self.data(using: .nonLossyASCII, allowLossyConversion: true)!
        return String(data: data, encoding: .utf8)!
    }

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

I have called this function like this below. Converted the response in the 'User' model.

let user = User() // Loaded API's response in this model
let textWithEmoji = user.aboutMe.decodeEmoji() //Here, I am getting the string as the same as before decoding
lblAboutMe.text = textWithEmoji

Following is the encoded string which is not decoding:

"I love too...\\n\✅ Laugh \?\?\\n\✅ Read novels \?\?\\n\✅ Watch movies \?\?\\n\✅ Go for bike rides \?\?\?\?\‍\♀\️\\n\✅ Go for long walks \?\?\?\?\‍\♀\️\\n\✅ Cook \?\?\?\?\‍\?\?\\n\✅ Travel \?\?\?\?\?\?\?\?\?\?\?\?\\n\✅ Eat \?\?\?\?\?\?\\n\✅ Play board games \♟\\n\✅ Go to the theatre \?\?\\nMy favourite season is autumn \?\?, i love superhero movies \?\?\‍\♂\️ and Christmas is the most wonderful time of the year! \?\?"

Here is the original text image:

Answer 1

The string you are using is invalid (" I love too...\\n\✅ Laugh \?\?\\n\✅ Read novels \?\?\\n\✅ Watch movies \?\?\\n\✅ ")

It should be in valid String literal "\\\?\\\?\\\✅"

You have a string non-BMP characters in form of JSON String. And your decodeEmoji cannot convert them into valid characters.

So we need to forcefully convert such strings.

extension String {
    var jsonStringRedecoded: String? {
        let data = ("\""+self+"\"").data(using: .utf8)!
        let result = try! JSONSerialization.jsonObject(with: data, options: .allowFragments) as! String
        return result
    }
}

After that you need to decode emoji from above string using below function.

extension String {  
    var decodeEmoji: String? {
          let data = self.data(using: String.Encoding.utf8,allowLossyConversion: false);
          let decodedStr = NSString(data: data!, encoding: String.Encoding.nonLossyASCII.rawValue)
          if decodedStr != nil{
            return decodedStr as String?
        }
          return self
    }
}

Usually JSON decoder can decode these type of characters into emoji May be there is chances of invalid JSON

First need to verify these things that json is valid or not before using.

USAGE:

let jsonDecodedString = "Your string".jsonStringRedecoded
let decodedEmojiText = jsonDecodedString?.decodeEmoji
debugPrint("\(decodedEmojiText)")