How to Convert Base64 into Nsdata in Swift

How to convert base64 into NSDATA in swift

This works:

Swift 3 and 4:

var audioData = Data(base64Encoded: recording_base64, options: .ignoreUnknownCharacters)

Swift 2:

var audioData = NSData(base64EncodedString: recording_base64, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)

How to convert Base64 string to NSData?

To convert from Base64 string to NSData

 let nsd: NSData = NSData(base64EncodedString: Image, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)!

To Convert to Blob

nsd.datatypeValue

Converting between NSData and base64 strings

Scroll down to the Conclusion section on the page you linked and download the provided NSData+Base64 files. Its the best solution I have seen so far and is incredibly easy to use. If you can learn anything about Cocoa, you can learn to use that project.

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Example

NSString *originalString = [NSString stringWithFormat:@"test"]; 
NSData *data = [NSData dataFromBase64String:originalString];  
NSLog([data base64EncodedString]); 

The above will print out the original string after converting it to base64 and back to a normal unencoded string.

How to convert a base64String to String in Swift?

Try this:

let base64Encoded = "YW55IGNhcm5hbCBwbGVhc3VyZS4="

var decodedString = ""
if let decodedData = Data(base64Encoded: base64Encoded) {
    decodedString = String(data: decodedData, encoding: .utf8)!
}

if !decodedString.isEmpty {
    print(decodedString)
} else {
    print("Oops, invalid input format!")
}

Make sure your base 64 encoded string is valid.

WARNING ^(edit)

In most base64 decoding implementations like Java, the padding-character is not needed, but Data(base64Encoded:) returns nil if it's missing.

Swift 5 solution; use String.fromBase64(_:) instead, after implementing like:

extension Data {
    /// Same as ``Data(base64Encoded:)``, but adds padding automatically
    /// (if missing, instead of returning `nil`).
    public static func fromBase64(_ encoded: String) -> Data? {
        // Prefixes padding-character(s) (if needed).
        var encoded = encoded;
        let remainder = encoded.count % 4
        if remainder > 0 {
            encoded = encoded.padding(
                toLength: encoded.count + 4 - remainder,
                withPad: "=", startingAt: 0);
        }

        // Finally, decode.
        return Data(base64Encoded: encoded);
    }
}

extension String {
    public static func fromBase64(_ encoded: String) -> String? {
        if let data = Data.fromBase64(encoded) {
            return String(data: data, encoding: .utf8)
        }
        return nil;
    }
}

As mentioned on editor's profile,
above edit's code allows Apache 2.0 license as well,
without attribution need.

swift:How to save the base64String encoded Image into local directory

You can save image in local directory in following way. Add Image extension with fileName.

let filePath = "\(NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0])/\(fileName)"
let imageData : Data = UIImagePNGRepresentation(image)! as Data
 imageData.write(toFile: filePath, atomically: true)

Convert base 64 string into image return nil in swift

The problem is that the string you pass to Data(base64Encoded: is not actually base64encoded, it contains some more plaintext in the front.

You need to remove that and only pass the actual base64 encoded image, like so:

let str = "/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAMCAgICAgMCAgIDAwMDBAYEBAQEBAgGBgUGCQgKCgkICQkKDA8MCgsOCwkJDRENDg8QEBEQCgwSExIQ..."
let dataDecoded : Data = Data(base64Encoded: str)!
let decodedimage = UIImage.init(data: dataDecoded)

Alternatively you can programatically split the original data at the , and take the second part as the actual data input.

At that point you can remove the options: .ignoreUnknownCharacters as well since now there should not be any non-base64 chars left - and if there are you should fix the data instead of the code.

Final note: depending on where you get the data from it might be a good idea to not force-unwrap anything and instead deal with a broken / missing image by e.g. displaying a placeholder image.

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