Clash Royale CLAN TAG

How to decode a base 64 string found in a JSON string to generate a UIImage

I have pasted my code below. Essentially, I have been given an SDK, which has a JSON string that I then have to parse in order to get to what is a base64 string from which a QR Code is generated. I have been working on it, but the code errors out at the "let nsd = ..." line, with the message: "Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value"

Any help of where I am going wrong would be greatly appreciated. I am a novice when it comes to Swift and programming in general, so am finding this quite challenging. I am also don't think I am correctly converted the response into a JSON, as that is where it is first errorring out.

func qrCodeGenerator(payload : String) {

guard let response = /response as a string from SDK/ else {return}


/* convert response string to an NSData response, so as to convert to JSON in the code below */
let nsd: NSData = NSData(base64Encoded: response, options: NSData.Base64DecodingOptions.ignoreUnknownCharacters)!

var jsonResponse = JSON.null

do {

/* convert the response to a json object */
try jsonResponse = JSONSerialization.jsonObject(with: nsd as Data, options: ) as! JSON

/* enter the result array, as the base64 string is contained there */
var result = jsonResponse["result"][0]
var resqr_64 = result["qr_b64"].stringValue

print(resqr_64)

var base64string = resqr_64

/*The base64 string lies beyond the comma*/
var base64image = String(base64string.split(separator: ",")[1]) as String

var decodeString : NSData = NSData(base64Encoded: base64image, options: )!
var decodedimage: UIImage = UIImage(data: decodeString as Data)!

QRCodeImageView.image = decodedimage
} catch {
print(error)
}
}


Any help would be greatly appreciated! Thank you so much.

NSData

Data

let nsd = Data(base64Encoded: response)

qr_b64

1 Answer
1

if let decodedData = Data(base64Encoded: (dataDict["THUMBNAIL"] as? String)! , options: .ignoreUnknownCharacters{

self.imgThumb.image = UIImage(data: decodedData)

}


try this code to get image from base64 string :)

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