Swift 2 JSON Byte array to UIImage

Question

My IOS app is retrieving a JSON Object containing a field "file" which is an image. This field is encoded by the server in Base 64

JSON Serialization: Optional({
file = "/9j/4AAQSkZJRgABAQAAAQABAAD/........

I would need to load this field in an UIImageView. I tried multiple ways without any success. here is an extract of my code:

        let task = session.dataTaskWithRequest(request, completionHandler: { (data: NSData?, response: NSURLResponse?, error: NSError?) -> Void in
        if (error == nil) {

            let json: AnyObject?
            let imageArray: NSData?
            do{
            try json = NSJSONSerialization.JSONObjectWithData(data!, options: [])
                imageArray = json!["file"] as? NSData
                print("JSON file: \(imageArray)")

            }
        catch
        {
            print("error Serialization")
            return
        }

but imageArray is nil...any idea how I can retrieve this field (Base 64 Byte array) and convert it in an UIImage ?

OOPer · Accepted Answer · 2016-07-03 22:10:21Z

4

JSON cannot contain binary data. It can only contain Strings, Numbers, Booleans and Nulls. You need to convert the base64 String to NSData yourself.

Replace the line imageArray = json!["file"] as? NSData to the following 5 lines.

if let fileBase64 = json!["file"] as? String {
    imageArray = NSData(base64EncodedString: fileBase64, options: [])
} else {
    print("missing `file` entry")
}

answered Jul 3, 2016 at 22:10

OOPer

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8 Comments

tiamat Over a year ago

ok, and how can I convert imageArray to UIImage ? I tried self.ordoPhoto.image = UIImage(data: imageArray!) but it doesn't work.

OOPer Over a year ago

Clarify what you mean with "it doesn't work"? Does it generate a build-time error? Causes your app crash? or always nil or something other?

tiamat Over a year ago

sorry for being unclear....my UIImageView ordoPhoto remains blank....even if I copy my imageArray by using self.ordoPhoto.image = UIImage(data: imageArray!)

OOPer Over a year ago

Check if imageArray is nil or not.

tiamat Over a year ago

it is not, I can print it, the content is finally there

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