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My code was working well on Xcode 6.4 with Swift 1.2:
var imageData = UIImageJPEGRepresentation(firstImageView.image!, 0.2)
let base64String = imageData!.base64EncodedStringWithOptions(.allZeros)
Once I moved to Xcode 7 and Swift 2 the following error appeared:
type of expression is ambiguous without more context
So I tried:
let base64String = imageData!.base64EncodedStringWithOptions(options: NSDataBase64EncodingOptions.allZeros)
But there is no "allZeros" option among NSDataBase64EncodingOptions.
467
Try this: let base64Encoded = "YW55IGNhcm5hbCBwbGVhc3VyZS4=" var decodedString = "" if let decodedData = Data(base64Encoded: base64Encoded) { decodedString = String(data: decodedData, encoding: . utf8)! }
Base-64 maps 3 bytes (8 x 3 = 24 bits) in 4 characters that span 6-bits (6 x 4 = 24 bits). The result looks something like "TWFuIGlzIGRpc3Rpb...".
Base64 is a group of similar binary-to-text encoding schemes that represent binary data in an ASCII string format by translating it into a radix-64 representation. The term Base64 originates from a specific MIME content transfer encoding.
You should use .Encoding64CharacterLineLength instead of .allZeros:
let imageData = UIImageJPEGRepresentation(firstImageView.image!, 0.2)
let base64String = imageData!.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.Encoding64CharacterLineLength)
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