SwiftUI: Add string to an other view

Question

Created Dec ’20

Replies 1

Boosts 0

Participants 2

Hello
I created a QR (view) code generator with a "favourites" button and I want to be able to save the String that the user inputs in the favourites view. How can I do it? (And I'm not good at Core Data, so i don't know how to save it)

Code Block import SwiftUI
import CoreImage.CIFilterBuiltins
struct QRView: View {
    let context = CIContext()
    var filter = CIFilter.qrCodeGenerator()
    
    @State var url: String = ""
    @Binding var isPresentedQR: Bool
    var body: some View {
        NavigationView{
            Form{
                Section(header: Text("Enter your Input value")){
                    TextField("Input",text: $url)
 						    .autocapitalization(.none)
				   }
                Section(header: Text("QR Code")){
                    Image(uiImage: generatedQRCodeImage(url: url))		
					 .resizable()
					 .interpolation(.none)
	 				 .frame(width: 250, height: 250, alignment: .center)
                }
                Section{
                    HStack{
                    Button(action: {
                        //What to put here
                    }) {
                        HStack{
                            Text("Add to Favorites")
                            Spacer()
                            Image(systemName: "bookmark")
                                .frame(width: 25, height: 25)
                                .clipShape(Circle())
                        }
                    }
                }
              }
            }
            .navigationTitle("QR")
            .navigationBarItems(trailing:
                                            Button(action: {
                                                isPresentedQR = false
                                            }) {
                                                Text("Back")
                                            }
                    )
        }
        
    }
    
    func generatedQRCodeImage(url: String) -> UIImage {
        let data = Data(url.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()
        
    }
}

Code Block struct Favorites: View {
    var body: some View {
        ScrollView(.vertical, showsIndicators: false) {
            VStack(alignment: .center, spacing: 20) {
    
            }
            .navigationBarTitle("Favorites")
        }
    }
}

Thank you

Boost

Answer 1

Claude31 OP

Dec ’20

Where is this favourites button ?

You probably don't need CoreData, but simply saving in some UserDefaults.

See here how to do it:
https ://www.hackingwithswift .com/books/ios-swiftui/storing-user-settings-with-userdefaults

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