Why base64 renditions of images are white in swift 3? - ios

Question

I have converted my images with this codes below and this will return base64 of my images but the problem is that when I upload them into the server I just see the white image - can you suggest me the better way to convert images to base64 or this is the best way that I choose
here is the converting image to base64
func base64(from image: UIImage) -> String? {
UIGraphicsBeginImageContext(image.size)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
let imageData = UIImageJPEGRepresentation(image!, 1.0)
if let imageString = imageData?.base64EncodedString(options: .endLineWithLineFeed) {
return imageString
}
return nil
}

Answer 1

Try this method:
func convertImageToBase64(_ image:UIImage) -> String
{
let imageData = UIImageJPEGRepresentation(image, 1)//get imageData from image
if(imageData != nil)
{
let Strbase64 = imageData?.base64EncodedString(options: .endLineWithCarriageReturn)//encode imageData
return Strbase64!//return encoded string
}
return ""
}

Answer 2

You passed a UIImage to this method, but never did anything with it, but rather created a new UIImage using UIGraphicsGetImageFromCurrentImageContext, but you never drew anything to that context. That's why the resulting images are white.
But you don't need those UIGraphics calls at all. Just grab the JPEG representation of the UIImage that you passed into this method, and convert it to a base 64 encoded string:
func convertImageToBase64(_ image: UIImage) -> String? {
return UIImageJPEGRepresentation(image, 1)?.base64EncodedString()
}

Answer 3

It is white because nothing is drawn on current context !!!
You are just UIGraphicsBeginImageContext with size
and get with UIGraphicsGetImageFromCurrentImageContext
it will always gives you a white image and there is no relation with Base64
If you want to render something then use like below
yourImageView.layer.render(in: UIGraphicsGetCurrentContext()!)
and after that fetch image from currentContext
EDIT
func base64(from image: UIImage) -> String? {
UIGraphicsBeginImageContext(image.size)
image.draw(in: CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height))
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
let imageData = UIImageJPEGRepresentation(image!, 1.0)
if let imageString = imageData?.base64EncodedString(options: .endLineWithLineFeed) {
return imageString
}
return nil
}

Answer 4

First check wether the error you are facing is from your app or server side .You can choose online base64 to image converter .Copy your base64 String and check them first , you can choose this link
https://codebeautify.org/base64-to-image-converter