Hi @wctjerry,

it was a long time that I did this day so I had too look back what the challenge was 😛.

If I remember correctly the original project shown by Paul uses a button and when you press it, it will show the recommended bed time right?

Well if you want to automate this you just have to create a computed propterty with the name calculatedBedtime and the type String. A Computed property is always updated so you can just show that property inside a text block:

            Section(header: Text("Recommended Bedtime")) {
                Text("\(calculatedBedtime)")
                    .font(.largeTitle)
            }

The computed property I used is shown below but you might have to adjust it to your needs.

var calculatedBedtime: String {
    let model = SleepCalculator()

    let components = Calendar.current.dateComponents([.hour, .minute], from: wakeUp)
    let hour = (components.hour ?? 0) * 60 * 60
    let minute = (components.minute ?? 0) * 60
    var bedTime = "Please set all input values"

    do {
        let prediction = try model.prediction(wake: Double(hour + minute), estimatedSleep: sleepAmount, coffee: Double(coffeeAmount))
        let sleepTime = wakeUp - prediction.actualSleep

        let formatter = DateFormatter()
        formatter.timeStyle = .short
        bedTime = formatter.string(from: sleepTime)
    } catch {
        alertTitle = "Error"
        alertMessage = "Sorry, there was a problem calculating your bedtime."
        showingAlert = true
    }

    return bedTime
}

I hope this helps you further?