I'm trying to create qr code for UUID, but the main thing that stops me is that ways that I saw on creating qr codes require using String instead of UUID, so that's what I went for.
var uuid: UUID
var uuidString: {uuid} //cannot convert return expression of type 'UUID' to return type 'String'
Another option was
var uuid = UUID().uuidString
But It gave error later, when I was trying to use qr generating algorithm on practice (full qr gen code below)
import SwiftUI
import CoreImage.CIFilterBuiltins
struct QrCodeGen : View {
let context = CIContext()
let filter = CIFilter.qrCodeGenerator()
var uuid = UUID().uuidString
var body : some View {
Image(uiImage: createQrCodeImage(uuid))
}
func createQrCodeImage(_ uuid: String) -> UIImage{
let data = Data(uuid.utf8)
filter.setValue(data, forKey: "inputMessage")
if let qrCodeImage = filter.outputImage{
if let qrCodeCGImage = context.createCGImage(qrCodeImage, from: qrCodeImage.extent){
return UIImage(cgImage: qrCodeCGImage)
}
}
return UIImage(systemName: "xmark") ?? UIImage()
}
}
Usage of generating qr:
NavigationLink(destination: QrCodeGen(uuid: Item.itemid)) //error: Value of type "NSManagedObject" has no member itemid
But later when showing text of Item.itemid everything is fine and recognised Reeboting my machine and relaunching Xcode dint solve the issue also.
This code works to return the UUIDString for a UUID:
struct TestUUID {
var uuid: UUID
var uuidString: String {return uuid.uuidString}
}
let aTestUUID = TestUUID(uuid: UUID())
print(aTestUUID.uuidString)
It isn't clear to me what you're asking in the second part of your question. What error are you getting?
("It gave me error" isn't very helpful)
Thanks a lot! that worked out for me. At that point error doesn't matter, it just went away when I used your solution. But error is under "Usage of generated QR"
You should accept my answer if it helped you.