I'm kinda new to swift and i need some help with encoding some image, putting it in a JSON and after retrieving it, decoding it back to NSData and recreating the image in an UIImage view controller.
I've found this post Convert Image to Base64 string in iOS + Swift but i get stuck with this part:
let decodedData = NSData(base64EncodedString: base64String, options: NSDataBase64DecodingOptions.fromRaw(0)!)
because the fromRaw method is not available anymore.
Thanks in advance
Later edit:
I'm using swiftyJson to parse the array and i'm getting the image data like this:
var base64String = arrayJson[0]["photo"].stringValue
var imageString = base64String as NSString
and after that i'm trying to decode it like this:
let decodedData = NSData(base64EncodedString: imageString, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)
I've also tried with the rawValue instead of IgnoreUnknownCharacters. Both return nil. Also tried with the base64String instead of imageString. Same thing.
You can do the following instead to make a base64 encoded string to an UIImage:
//base64 string to NSData
let decodedData = NSData(base64EncodedString: base64String, options: NSDataBase64DecodingOptions(rawValue: 0))
//NSData to UIImage
var decodedIamge = UIImage(data: decodedData!)
NSDataBase64EncodingOptions.fromRaw(0)! now is changed to NSDataBase64DecodingOptions(rawValue: 0)
For more encode/decode details, you can visit this post: Convert between UIImage and Base64 string
To encode an image:
let image = UIImage(...)
let quality = 1.0
let data: NSData = UIImageJPEGRepresentation(image, quality)!
To decode an image:
let decodedImage = UIImage(data: data)
The reason why these methods return nil for you could be that your base64string is an URL and Filename safe variant, meaning character 62 (0x3E) is replaced with a "-" (minus sign) and character 63 (0x3F) is replaced with a "_" (underscore) as noted here base64 alphabet
Try replacing character _ with / and character - with + in your string.
You could use the following code:
base64string = base64string.stringByReplacingOccurrencesOfString("-", withString: "+", options: NSStringCompareOptions.LiteralSearch, range: nil)
base64string = base64string.stringByReplacingOccurrencesOfString( "_" , withString: "/", options: NSStringCompareOptions.LiteralSearch, range: nil)
Also be aware of the correct length of the string. it has to be a multiple of 4
- take a look at this answer padded string.
NSData Class Reference : https://developer.apple.com/library/ios/documentation/Cocoa/Reference/Foundation/Classes/NSData_Class/index.html#//apple_ref/c/tdef/NSDataBase64DecodingOptions
NSDataBase64DecodingOptions :
struct NSDataBase64DecodingOptions : RawOptionSetType {
init(_ rawValue: UInt)
init(rawValue rawValue: UInt)
static var IgnoreUnknownCharacters: NSDataBase64DecodingOptions { get }
}
Have you tried one of the followings :
let decodedData = NSData(base64EncodedString: base64String, options: NSDataBase64DecodingOptions(rawValue: 0)!)
let decodedData = NSData(base64EncodedString: base64String, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)
Related
I am trying to convert base64 string in to string format but I always get nil. My base64 string is "NWQwMDU2ZjhiZjRjYmI2M2MxZTI0NzQzNjAxMjMxMzAyMDh8NjAxMjMxMzAyMDh8NWQwMDU2Zjhi\nZjRjYmI2M2MxZTI0NzQzfDYwMTIzMTMwMjA4fG5hdmlnYXRpb25UZXN0MDA1fDIwMTktMDYtMjEg\nMDk6MzQ6MDB8MA==\n"
After decoding, Is suppose to look like this "5d0056f8bf4cbb63c1e2474360123130208|60123130208|5d0056f8bэ͌Ŕ٥ѥQشĂs3C�".
Here is my code event I tried to remove the "=\n" from string but not succeed.
func qrScanningSucceededWithCode(_ str: String?) {
scanTicketView.qrData = QRData(codeString: str)
let charsToRemove: Set<Character> = Set("=\n")
let newNumberCharacters = String(str!.filter { !charsToRemove.contains($0) })
let decodedString = String(data: Data(base64Encoded: newNumberCharacters)!, encoding: .utf8)!
print(decodedString)
}
This works:
let string = "NWQwMDU2ZjhiZjRjYmI2M2MxZTI0NzQzNjAxMjMxMzAyMDh8NjAxMjMxMzAyMDh8NWQwMDU2Zjhi\nZjRjYmI2M2MxZTI0NzQzfDYwMTIzMTMwMjA4fG5hdmlnYXRpb25UZXN0MDA1fDIwMTktMDYtMjEg\nMDk6MzQ6MDB8MA==\n"
let joined = string.replacingOccurrences(of: "\n", with: "")
if let data = Data(base64Encoded: joined) {
String(data: data, encoding: .utf8)
}
I'm trying to send image to server via JSON string. Problem is the server didn't see my image in PNG or JPG format. Here is code how i do it:
enter image description here
That how i convert parameters to JSON string
enter image description here
What i want - it's encode UIImage to base64 string and send to server.
Thank You!
try using the below code and check if any error occurs or image value is nil
if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
if let imageData = UIImageJPEGRepresentation(image, 0.5) {
let base64String = imageData.base64EncodedString(options: Data.Base64EncodingOptions.init(rawValue: 0))
let dict: [String: Any] = ["data": base64String]
do {
let data = try JSONSerialization.data(withJSONObject: dict, options: .prettyPrinted)
if let string = String(data: data, encoding: .utf8) {
socket.write(string)
}
} catch {
print(error.localizedDescription)
}
}
}
This is how I create Data from UIImage:
let data = UIImagePNGRepresentation(image)
And then I need to convert it to String;
if let data = data {
let stringFromData = String(data: data, encoding: .utf8)
}
but stringFromData is nil. Why?
You can get it using the Data method base64EncodedString()
if let data = data {
let stringFromData = data.base64EncodedString()
// to decode base 64 string you can use Data base64Encoded String initializer
if let dataFromBase64 = Data(base64Encoded: stringFromData) {
print(data)
}
}
Convert Your image data in Base64 string
For Encode
let stringFromData : Data = Data(base64Encoded: strBase64, options: .ignoreUnknownCharacters)!
And decode
let strBase64 = imageData.base64EncodedStringWithOptions(.allZeros)
I am working on an iOS project. It stores audio on web server in the form of base64 string. When I request server to get base64 Strings for all audios and tried convert it in NSData I am getting nil.
do
{
var audioData: NSData! = NSData(base64EncodedString: audioBase64String, options: NSDataBase64DecodingOptions(rawValue:0))
if audioData != nil
{
let sound = try AVAudioPlayer(data: audioData)
sound.play()
}
else
{
print("Data Not Exist")
}
}
catch
{
}
On Android same base64 string is converted into byte array and is playing, but in iOS audioBase64String return nil for NSData.
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)
For Swift 3:
var audioData = Data(base64Encoded: recording_base64, options: .ignoreUnknownCharacters)
Try this library. You can get NSData from base64 string and then init your AVAudioPlayer with this data. Please read AVAudioPlayer Apple's Documentation.
When I get my JSON back from my API this is how it looks
{
data:[
100,
80,
105,
99,
etc
]
}
How do I take this array and turn it back into a base64 string, then NSData and finally UIImage.
Here is what I have thus far.
let byteArray = todo["image"]["data"].arrayObject
var data = NSData(bytes: byteArray!, length: byteArray!.count)
var image = UIImage(data: data)
When printing the data it prints fine but returns nil for image.
Have you tried iterating throug the array and building a string from its elements, the use base64 encoding/decoding api to get back from string to NSData? Something like that(I'm writing from iPad so I can't check).
var encodedString=""
for smallString in byteArray {
encodedString += String(smallString)
}
let data = NSData(base64EncodedString: base64Encoded, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)
var image = UIImage(data: data)
let byteArray = todo["image"]["data"].arrayObject
let string = String(bytes: byteArray, encoding: .utf8)
let encodedImageData = string
let imageData = NSData(base64Encoded: encodedImageData!)
let image = UIImage(data: imageData! as Data)