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@@ -0,0 +1,92 @@
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+//
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+// AlarmThresholdPickerSection.swift
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+// LoopFollow
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+//
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+// Created by Jonas Björkert on 2025-05-06.
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+// Copyright © 2025 Jon Fawcett. All rights reserved.
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+//
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+
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+import SwiftUI
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+import HealthKit
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+
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+struct AlarmThresholdRow: View {
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+ // ── Public API ──────────────────────────────────────────────────────────────
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+ let title: String
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+ let range: ClosedRange<Double>
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+ let step: Double // 1 for mg/dL, 0.1 for mmol/L
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+ @Binding var value: Double // **stored in mg/dL**
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+
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+ // ── Private state ──────────────────────────────────────────────────────────
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+ @State private var showPicker = false
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+
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+ // Preferred unit – mmol/L or mg/dL
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+ private var unit: HKUnit { UserDefaultsRepository.getPreferredUnit() }
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+
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+ private var displayValue: String {
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+ format(value, in: unit)
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+ }
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+
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+ // Generate all selectable display values for the picker
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+ private var pickerValues: [Double] {
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+ stride(from: range.lowerBound, through: range.upperBound, by: step)
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+ .map { $0 }
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+ }
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+
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+ var body: some View {
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+ Section {
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+ // Collapsed row
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+ HStack {
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+ Text(title)
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+ Spacer()
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+ Text(displayValue)
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+ .foregroundColor(.secondary)
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+ }
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+ .contentShape(Rectangle())
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+ .onTapGesture { showPicker = true }
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+ }
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+ .sheet(isPresented: $showPicker) {
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+ // Expanded wheel picker
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+ NavigationStack {
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+ VStack {
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+ Picker("", selection: bindingForPicker) {
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+ ForEach(pickerValues, id: \.self) { v in
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+ Text(format(v, in: unit))
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+ .tag(v)
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+ }
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+ }
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+ .pickerStyle(.wheel)
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+ }
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+ .navigationTitle(title)
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+ .toolbar {
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+ ToolbarItem(placement: .confirmationAction) {
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+ Button("Done") { showPicker = false }
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+ }
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+ }
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+ } .presentationDetents([.fraction(0.35), .medium]) // 35 % or medium height
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+ .presentationDragIndicator(.visible) // the little grab-bar
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+ }
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+ }
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+
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+ // MARK: – Helpers
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+ private func format(_ mgdl: Double, in unit: HKUnit) -> String {
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+ if unit == .millimolesPerLiter {
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+ let mmol = mgdl / 18.0
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+ return String(format: "%.1f mmol/L", mmol)
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+ } else {
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+ return String(format: "%.0f mg/dL", mgdl)
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+ }
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+ }
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+
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+ // Bind the picker directly to `value`, snapping to the closest choice
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+ private var bindingForPicker: Binding<Double> {
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+ Binding(
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+ get: {
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+ // pick the closest representable value
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+ pickerValues.min(by: { abs($0 - value) < abs($1 - value) }) ?? value
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+ },
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+ set: { newVal in
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+ value = newVal // stored in mg/dL
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+ }
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+ )
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+ }
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+}
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Jonas Björkert