how to share QR created image swift 4 - ios

Question

I am creating QR code in swift and assigning it to an imageView
when I try to share that image with generated code, it does not shares that image,
func createCode()
{
let text = email
let data = text.data(using: .ascii, allowLossyConversion: false)
fillter = CIFilter(name: "CIQRCodeGenerator")
fillter.setValue(data, forKey: "inputMessage")
let transform = CGAffineTransform(scaleX: 5.0, y: 5.0)
CreatedImage = UIImage(ciImage: (fillter.outputImage?.transformed(by: transform))!)
imageCode.image = CreatedImage as UIImage
}
and this is share button
#IBAction func shareButtonPressed(_ sender: Any)
{
let activityItem: [UIImage] = [imageCode.image!]
let activity = UIActivityViewController(activityItems: activityItem as [UIImage], applicationActivities: [])
activity.popoverPresentationController?.sourceView = self.view
self.present(activity, animated: true, completion: nil)
}
it shows like it has nothing to share, it does not pick any bit of image

Answer 1

Have you created a variable to store the image somewhere e.g.
var generatedImage: UIImage?
Assuming then, that I have read your question correctly, in your creation function you can cast the image at the end of the function e.g:
generatedImage = imageCode.image
Then in your share function you could say:
guard let validQR = generatedImage else { return }
let activityItem: [UIImage] = [validQR]
let activity = UIActivityViewController(activityItems: activityItem as [UIImage], applicationActivities: [])
activity.popoverPresentationController?.sourceView = self.view
self.present(activity, animated: true, completion: nil)
I tested with an image from my Bundle e.g:
generatedImage = UIImage(named: "SCNPyramid")
And I was able to share the image :)

Answer 2

after searching all..
I cam I to know that make a programmatically screen shot of desired view, that is sent..

Answer 3

I have been having the same problem and solved it by first saving the generated qr code image to a file and then sharing the file url.
private func shareQRCode() {
guard let qrcode = self.qrCodeImage,
let data = qrcode.pngData(),
let url = self.saveInCache(data: data, fileName: "QRCode.png") else { return }
// set up activity view controller
let imageToShare = [url]
let activityViewController = UIActivityViewController(activityItems: imageToShare, applicationActivities: nil)
activityViewController.popoverPresentationController?.sourceView = self.view // so that iPads won't crash
// work around to prevent dismissing current view after saving image
let tempController = TransparentViewController()
tempController.modalPresentationStyle = .overFullScreen
activityViewController.completionWithItemsHandler = { [weak tempController] _, _, _, _ in
if let presentingViewController = tempController?.presentingViewController {
presentingViewController.dismiss(animated: false, completion: nil)
} else {
tempController?.dismiss(animated: false, completion: nil)
}
}
present(tempController, animated: true) { [weak tempController] in
tempController?.present(activityViewController, animated: true, completion: nil)
}
}
Here is the code for saveInCache function:
private func saveInCache(data: Data, fileName: String) -> URL? {
let paths = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)
let path = paths[0]
let fileUrl = path.appendingPathComponent(fileName)
let fileManager = FileManager.default
if self.pathExists(fileUrl) {
do {
try fileManager.removeItem(at: fileUrl)
} catch { return fileUrl }
}
guard fileManager.createFile(atPath: fileUrl.path, contents: data, attributes: nil) else {
return nil
}
return fileUrl
}
private func pathExists(_ path: URL) -> Bool {
let fileManager = FileManager.default
var isDir: ObjCBool = false
if fileManager.fileExists(atPath: path.path, isDirectory: &isDir) {
if isDir.boolValue {
// file exists and is a directory
return true
} else {
// file exists and is not a directory
return true
}
} else {
// file does not exist
return false
}
}
And here a simple Transparent View Controller for ActivityViewController work around:
final class TransparentViewController: UIViewController {
override func viewDidLoad() {
self.view.backgroundColor = .clear
}
}