Converting from text field string to double-CodePudding

I am currently working on a weight tracking app as a tutorial project for Swift. I am implementing the MVVM pattern, and I have a weightEntry class, where one of the attributes is weight, a Double.

In my view I have one ViewModel object, which has a weightEntry object. I would like to assign the entry in the Weight text field to my weightEntry.weight, however I'm not sure how I could convert the format from string to double in the view?

Below is the code in the view:

    @ObservedObject var mainViewVM = MainViewViewModel()
    
    
    var body: some View {
        VStack(alignment: .leading, spacing: /*@START_MENU_TOKEN@*/nil/*@END_MENU_TOKEN@*/, content: {
            
            
            Text("Weight Tracking App").font(.title)
            
            HStack {
                Text("Add your current weight").font(.subheadline)
                TextField("Weight", text: $mainViewVM.weightEntry.weight)
                    .padding()
                    .keyboardType(.decimalPad)
            }

CodePudding user response：

There is a initializer which can take a Double and a format description , init(_:value:format:prompt:).

TextField("Weight", value: $mainViewVM.weightEntry.weight, format: .number.precision(.fractionLength(1)))