encode image to base64, get a invalid base64 string (ios using base64EncodedStringWithOptions)

Question

Here is my code.

  UIImage *img = [UIImage imageNamed:@\"white.jpeg\"];
  NSData *imageData = UIImagePNGRepresentation(img);
  NSString *imageString = [imageData         


        

Answer 1

I think you should replace the your options parameter

Change:

NSString *imageString = [imageData base64EncodedStringWithOptions:0];

To:

NSString *imageString = [imageData base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed];

And just in case you'd like it:

- (NSString *)imageToNSString:(UIImage *)image
{
    NSData *data = UIImagePNGRepresentation(image);

    return [data base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed];
}

- (UIImage *)stringToUIImage:(NSString *)string
{
    NSData *data = [[NSData alloc]initWithBase64EncodedString:string options:NSDataBase64DecodingIgnoreUnknownCharacters];

    return [UIImage imageWithData:data];
}

Remember that this is an iOS 7 api.

Answer 2

Yap, I find the problem is I don't encode the url.

In the post data my base64 "+" character was translate to " " character.

So I get the invalid base64 string.

Thanks Logan.

Answer 3

replace + to %2B ios replace all + to " " space that make image invalid

also backend must handle it too

- (NSString *)base64String:(UIImage*)image {return [[UIImageJPEGRepresentation(image,1) base64EncodedStringWithOptions:NSDataBase64EncodingEndLineWithLineFeed] stringByReplacingOccurrencesOfString:@"+" withString:@"%2B"];}

Answer 4

inspired from Fadi Abuzant answer here is the Swift 3 version

stringBase64 = stringBase64.replacingOccurrences(of: "+", with: "%2B")