how to convert Array of UIImage to Array of base64 in swift 3 ?

Question

I have an array of images in my codes that are [UIImage] but I want to convert them to base64 - I couldn't ! - I found similar questions but when I used their answers I received Fatal Error

for i in  0...tinyViewController.imageUpload.count - 1 {
        print(i)


        let imageData = UIImageJPEGRepresentation(tinyViewController.imageUpload[i] , 1)

        let base64String = (imageData! as Data).base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0))
        print(base64String)

}

fatal error: unexpectedly found nil while unwrapping an Optional value (lldb) — Saeed Rahmatolahi
– Saeed Rahmatolahi, Commented Jul 29, 2017 at 12:57

Aleksandr Honcharov · Accepted Answer · 2017-07-29 13:03:07Z

1

Try this function to convert each UIImage to base64 String. I used it in my project. It works perfect for me.

func base64(from image: UIImage) -> String? {
        let imageData = UIImagePNGRepresentation(image)
        if let imageString = imageData?.base64EncodedString(options: .endLineWithLineFeed) {
            return imageString
        }
        return nil
    }

So, do this:

for i in  0...tinyViewController.imageUpload.count - 1 {
        print(i)

        print(base64(from: tinyViewController.imageUpload[i]))

}

edited Jul 29, 2017 at 13:03

answered Jul 29, 2017 at 12:57

Aleksandr Honcharov

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10 Comments

Saeed Rahmatolahi Over a year ago

this method will not execute because my images are in an array in a for loop and I should use them in this method but swift doesn't let me to use that ?

Aleksandr Honcharov Over a year ago

I updated my answer. Insert my function and change your code as I wrote.

Saeed Rahmatolahi Over a year ago

Again I received fatal error: unexpectedly found nil while unwrapping an Optional value (lldb)

Aleksandr Honcharov Over a year ago

Maybe the error in another place of your code? There is no force unwrapping in my code.

Saeed Rahmatolahi Over a year ago

where should be the function that you write ? before loop or after loop or inside that?

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