How can I encode a string to Base64 in Swift?

Question

I want to convert a string to Base64. I found answers in several places, but it does not work anymore in Swift. I am using Xcode 6.2. I believe the answer might be work in p

Answer 1

SwiftyBase64 (full disclosure: I wrote it) is a native Swift Base64 encoding (no decoding library. With it, you can encode standard Base64:

let bytesToEncode : [UInt8] = [1,2,3]
let base64EncodedString = SwiftyBase64.EncodeString(bytesToEncode)

or URL and Filename Safe Base64:

let bytesToEncode : [UInt8] = [1,2,3]
let base64EncodedString = SwiftyBase64.EncodeString(bytesToEncode, alphabet:.URLAndFilenameSafe)

Answer 2

Swift 4.0.3

import UIKit

extension String {

func fromBase64() -> String? {
    guard let data = Data(base64Encoded: self, options: Data.Base64DecodingOptions(rawValue: 0)) else {
        return nil
    }

    return String(data: data as Data, encoding: String.Encoding.utf8)
}

func toBase64() -> String? {
    guard let data = self.data(using: String.Encoding.utf8) else {
        return nil
    }

    return data.base64EncodedString(options: Data.Base64EncodingOptions(rawValue: 0))
    }
}

Answer 3

You could just do a simple extension like:

import UIKit

// MARK: - Mixed string utils and helpers
extension String {


    /**
    Encode a String to Base64

    :returns: 
    */
    func toBase64()->String{

        let data = self.dataUsingEncoding(NSUTF8StringEncoding)

        return data!.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0))

    }

}

iOS 7 and up

Answer 4

Swift 4.2

"abcd1234".data(using: .utf8)?.base64EncodedString()

Answer 5

After thorough research I found the solution

Encoding

    let plainData = (plainString as NSString).dataUsingEncoding(NSUTF8StringEncoding)
    let base64String =plainData.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.fromRaw(0)!)
    println(base64String) // bXkgcGxhbmkgdGV4dA==

Decoding

    let decodedData = NSData(base64EncodedString: base64String, options:NSDataBase64DecodingOptions.fromRaw(0)!)
    let decodedString = NSString(data: decodedData, encoding: NSUTF8StringEncoding)    
    println(decodedString) // my plain data

More on this http://creativecoefficient.net/swift/encoding-and-decoding-base64/

Answer 6

Swift

import Foundation

extension String {

    func fromBase64() -> String? {
        guard let data = Data(base64Encoded: self) else {
            return nil
        }

        return String(data: data, encoding: .utf8)
    }

    func toBase64() -> String {
        return Data(self.utf8).base64EncodedString()
    }

}