How can I convert byte array to base64 string in swift?

Question

When I get my JSON back from my API this is how it looks

{
  data:[
     100,
     80,
     105,
     99,
     etc
  ]

}

How do I take this array and turn it back into a base64 string, then NSData and finally UIImage. Here is what I have thus far.

let byteArray = todo["image"]["data"].arrayObject
var data = NSData(bytes: byteArray!, length: byteArray!.count)
var image = UIImage(data: data)

When printing the data it prints fine but returns nil for image.

it has a few fields before it but all I need to figure out is how to convert the data array of bytes to NSData — ConnorB
– ConnorB, Commented Apr 14, 2016 at 5:33
Assuming that these are decimal values, this does not look like base64 data. — ryantxr
– ryantxr, Commented Apr 14, 2016 at 5:55

Andrea · Accepted Answer · 2016-04-14 06:06:22Z

1

Have you tried iterating throug the array and building a string from its elements, the use base64 encoding/decoding api to get back from string to NSData? Something like that(I'm writing from iPad so I can't check).

var encodedString=""
for smallString in byteArray {
   encodedString += String(smallString)
}
let data = NSData(base64EncodedString: base64Encoded, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)
var image = UIImage(data: data)

edited Apr 14, 2016 at 6:06

answered Apr 14, 2016 at 4:50

Andrea

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4 Comments

ConnorB Over a year ago

What do you mean by encoded string. All I have is a data array with bytes. That is what my API returns to me

Andrea Over a year ago

Isn't the content of your array a string representation of the base 64 encode image?

ConnorB Over a year ago

No my API stores the encoded base 64 string as a BLOB but blobs return the data as a byte array

Andrea Over a year ago

For instance this is a piece of image base64 encoded: iVBORw0KGgoAA and this is a C byte array byte[] bytes = { 3, 10, 8, 25 }; check here stackoverflow.com/questions/11860830/byte-array-to-nsdata

JoeZ · Accepted Answer · 2021-07-08 20:40:26Z

0

    let byteArray = todo["image"]["data"].arrayObject         
    let string = String(bytes: byteArray, encoding: .utf8)
    let encodedImageData = string
    let imageData = NSData(base64Encoded: encodedImageData!)
    let image = UIImage(data: imageData! as Data)

answered Jul 8, 2021 at 20:40

JoeZ

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