Swift base64 decoding returns nil

Question

I am trying to decode a base64 string to an image in Swift using the following code:

let decodedData=NSData(base64EncodedString: encodedImageData, options: N         


        

Answer 1

When the number of characters is divisible by 4, you need to avoid padding.

private func base64PaddingWithEqual(encoded64: String) -> String {
  let remainder = encoded64.characters.count % 4
  if remainder == 0 {
    return encoded64
  } else {
    // padding with equal
    let newLength = encoded64.characters.count + (4 - remainder)
    return encoded64.stringByPaddingToLength(newLength, withString: "=", startingAtIndex: 0)
  }
}