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SOLVED: Submitting Int Into Coredata always 0

Forums > SwiftUI

I have a form that submits info into coredata.

The strings go in fine but the integer is always 0.

The code i have is as follows:


import SwiftUI

struct NewHumidor: View {
    //give access to the data storage
    @Environment(\.managedObjectContext) var managedObjectContext
    @Environment (\.presentationMode) var presentationMode

    @State var humName = ""
    @State var humLoc = ""
    @State var cigCnt: Int16? = nil

    var body: some View {
        NavigationView{
            Form{
                Section(header: Text("Humidor Details")){
                    TextField("Humidor Name", text: $humName)
                    TextField("Humidor Location", text: $humLoc)
                    TextField("Cigar Count", value: $cigCnt, formatter: NumberFormatter())

                }
                Button(action: {
                    //makes sure that name is not blank
                    guard self.humName != "" else {return}
                    let newHum = Humidors(context: self.managedObjectContext)
                    newHum.name = self.humName
                    newHum.location = self.humLoc
                    newHum.cigarcount = self.cigCnt

                    newHum.id = UUID()
                    do {
                        try self.managedObjectContext.save()
                        print("Humidor Created")
                        self.presentationMode.wrappedValue.dismiss()
                    } catch {
                        print(error.localizedDescription)
                    }

                }){
                    Text("Save New Humidor")
                }
            .navigationBarTitle("New Humidor")
            }
        }
    }
}

struct NewHumidor_Previews: PreviewProvider {
    static var previews: some View {
        NewHumidor()
    }
}

I am getting the error message:

Value of optional type 'Int16?' must be unwrapped to a value of type 'Int16'

If anyone could point me in the right direction, i would be very greatfull.

Thanks

Adam

3      

@State var cigCnt: Int16? = nil

cigCnt is optional, and the TextField cannot take an optional.

@State var cigCnt: Int16 = 0

Will make the error go away and work as intended. If cigCnt needed to be optional, that would need to be addressed.

3      

Assuming that it does need to be optional (because i dont want a preselected value), what steps would i need to take here. Apologies in advance, i am brand new to this.

Appreciate your help in advance.

3      

My experience with CoreData and SwiftUI is that the TextField and the NumberFormatter() just doesn't work with Int16. You could cast your value

newHum.cigarcount = Int16(self.cigCnt) ?? 0

and set it to 0 if none was entered.

3      

That is still giving me an error unfortunately.

Chnaging that line to your suggestion give me the following error on that line.

Initializer 'init(_:radix:)' requires that 'Int16?' conform to 'StringProtocol'

3      

Also, would you suggest that Int would be better to use than Int16? Or do they act the same in this scenario?

3      

I came up with that I changed my TextField to a normal textfield without NumberFormatter. Changing the Int16 to Int could help here but I'm not sure with CoreData entities.

3      

In the end i just made it a String and made the keyboard numbers only. Major workaround but at least it lets me continue. Thanks all

3      

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