Add active insulin (IOB) value in Today widget (LoopKit#635)

* Update character count syntax for Swift 4

Avoids warnings from deprecated 'characters' syntax.

* Add 1024x1024 icon

Avoids compile-time warning about missing icon.  Doesn't actually look good at this size - it's just a scaled-up version of a smaller icon, but it avoids the warning.

* Add IOB to status widget

* Don't set context.activeInsulin on error

* Remove ActiveInsulinContext; use NumberFormatter

Struct form of ActiveInsulinContext is removed; just use a Double value instead, as with batteryPercentage. 
Use NumberFormatter to format IOB value.

* Fix var vs. let for activeInsulinString

* Bump version on StatusExtensionContext

* Revert "Update character count syntax for Swift 4"

This reverts commit 009e895.

* Revert "Add 1024x1024 icon"

This reverts commit ca10d0a.

* Add IOB label to storyboard

* Put IOB label calculation into separate block

* Adjust placement of label on storyboard; add constraints

* Format IOB label as NSLocalizedString

* Set end date for widget glucose chart

Common/Models/StatusExtensionContext.swift

@@ -266,14 +266,15 @@ extension DatedRangeContext: RawRepresentable {
 
 struct StatusExtensionContext: RawRepresentable {
     typealias RawValue = [String: Any]
-    private let version = 3
+    private let version = 4
 
     var glucose: [GlucoseContext]?
     var predictedGlucose: PredictedGlucoseContext?
     var reservoir: ReservoirContext?
     var loop: LoopContext?
     var netBasal: NetBasalContext?
     var batteryPercentage: Double?
+    var activeInsulin: Double?
     var targetRanges: [DatedRangeContext]?
     var temporaryOverride: DatedRangeContext?
     var sensor: SensorDisplayableContext?
@@ -307,6 +308,8 @@ struct StatusExtensionContext: RawRepresentable {
 
         batteryPercentage = rawValue["batteryPercentage"] as? Double
 
+        activeInsulin = rawValue["activeInsulin"] as? Double
+
         if let rawValue = rawValue["targetRanges"] as? [DatedRangeContext.RawValue] {
             targetRanges = rawValue.flatMap({return DatedRangeContext(rawValue: $0)})
         }
@@ -331,6 +334,7 @@ struct StatusExtensionContext: RawRepresentable {
         raw["loop"] = loop?.rawValue
         raw["netBasal"] = netBasal?.rawValue
         raw["batteryPercentage"] = batteryPercentage
+        raw["activeInsulin"] = activeInsulin
         raw["targetRanges"] = targetRanges?.map({return $0.rawValue})
         raw["temporaryOverride"] = temporaryOverride?.rawValue
         raw["sensor"] = sensor?.rawValue

Loop Status Extension/Base.lproj/MainInterface.storyboard

@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12121" systemVersion="16G24b" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="64E-I5-5c4">
-    <device id="retina4_7" orientation="portrait">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13771" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="64E-I5-5c4">
+    <device id="retina5_5" orientation="portrait">
         <adaptation id="fullscreen"/>
     </device>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12089"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13772"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
@@ -42,11 +42,24 @@
                                                 <nil key="textColor"/>
                                                 <nil key="highlightedColor"/>
                                             </label>
+                                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" layoutMarginsFollowReadableWidth="YES" text="IOB 1.0 U" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="UPi-dG-yYD">
+                                                <rect key="frame" x="8" y="0.0" width="343" height="50"/>
+                                                <constraints>
+                                                    <constraint firstAttribute="height" relation="greaterThanOrEqual" constant="40" id="Va8-zN-Zxc"/>
+                                                </constraints>
+                                                <fontDescription key="fontDescription" type="boldSystem" pointSize="15"/>
+                                                <nil key="textColor"/>
+                                                <nil key="highlightedColor"/>
+                                            </label>
                                         </subviews>
                                         <constraints>
+                                            <constraint firstItem="UPi-dG-yYD" firstAttribute="leading" secondItem="9iF-xY-Bh4" secondAttribute="leading" id="7Jj-0n-7D1"/>
+                                            <constraint firstItem="UPi-dG-yYD" firstAttribute="bottom" secondItem="9iF-xY-Bh4" secondAttribute="bottom" id="GsE-4E-FbA"/>
                                             <constraint firstItem="9iF-xY-Bh4" firstAttribute="top" secondItem="3n2-yC-jGi" secondAttribute="top" id="HSD-ba-SBR"/>
                                             <constraint firstAttribute="bottom" secondItem="9iF-xY-Bh4" secondAttribute="bottom" id="LtS-Ct-5Wl"/>
+                                            <constraint firstItem="UPi-dG-yYD" firstAttribute="height" secondItem="9iF-xY-Bh4" secondAttribute="height" id="Qa0-KT-ozH"/>
                                             <constraint firstItem="9iF-xY-Bh4" firstAttribute="leading" secondItem="3n2-yC-jGi" secondAttribute="leading" constant="8" id="cIA-WI-DT4"/>
+                                            <constraint firstAttribute="trailing" secondItem="UPi-dG-yYD" secondAttribute="trailing" constant="8" id="uU7-uQ-0lP"/>
                                             <constraint firstAttribute="trailing" secondItem="9iF-xY-Bh4" secondAttribute="trailing" constant="8" id="x9b-EB-fji"/>
                                         </constraints>
                                     </view>
@@ -76,6 +89,7 @@
                     <connections>
                         <outlet property="glucoseChartContentView" destination="GVu-hk-PBg" id="gfZ-nx-P6V"/>
                         <outlet property="hudView" destination="VIh-8L-VsB" id="NsP-iq-J4a"/>
+                        <outlet property="insulinLabel" destination="UPi-dG-yYD" id="mhC-fv-uD4"/>
                         <outlet property="subtitleLabel" destination="9iF-xY-Bh4" id="PM8-hd-IB3"/>
                     </connections>
                 </viewController>

Loop Status Extension/StatusViewController.swift

@@ -26,6 +26,7 @@ class StatusViewController: UIViewController, NCWidgetProviding {
         }
     }
     @IBOutlet weak var subtitleLabel: UILabel!
+    @IBOutlet weak var insulinLabel: UILabel!
     @IBOutlet weak var glucoseChartContentView: LoopUI.ChartContainerView!
 
     private lazy var charts: StatusChartsManager = {
@@ -65,6 +66,8 @@ class StatusViewController: UIViewController, NCWidgetProviding {
         super.viewDidLoad()
         subtitleLabel.isHidden = true
         subtitleLabel.textColor = .subtitleLabelColor
+        insulinLabel.isHidden = true
+        insulinLabel.textColor = .subtitleLabelColor
 
         let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(openLoopApp(_:)))
         view.addGestureRecognizer(tapGestureRecognizer)
@@ -166,6 +169,7 @@ class StatusViewController: UIViewController, NCWidgetProviding {
         }
 
         subtitleLabel.isHidden = true
+        insulinLabel.isHidden = true
 
         let dateFormatter: DateFormatter = {
             let dateFormatter = DateFormatter()
@@ -175,7 +179,25 @@ class StatusViewController: UIViewController, NCWidgetProviding {
             return dateFormatter
         }()
 
+        let insulinFormatter: NumberFormatter = {
+            let numberFormatter = NumberFormatter()
+
+            numberFormatter.numberStyle = .decimal
+            numberFormatter.minimumFractionDigits = 1
+            numberFormatter.maximumFractionDigits = 1
+
+            return numberFormatter
+        }()
 
+        if let activeInsulin = context.activeInsulin, let valueStr = insulinFormatter.string(from:NSNumber(value:activeInsulin))
+        {
+            insulinLabel.text = String(format: NSLocalizedString(
+                    "IOB %1$@ U",
+                    comment: "The subtitle format describing units of active insulin. (1: localized insulin value description)"),
+                                        valueStr)
+            insulinLabel.isHidden = false
+        }
+
         if let glucose = context.glucose,
             glucose.count > 0 {
             let unit = glucose[0].unit
@@ -193,6 +215,10 @@ class StatusViewController: UIViewController, NCWidgetProviding {
             if let first = glucose.first {
                 charts.startDate = first.startDate
             }
+
+            // Showing the whole history plus full prediction in the glucose plot
+            // is a little crowded, so limit it to three hours in the future:
+            charts.maxEndDate = Date().addingTimeInterval(TimeInterval(hours: 3))
 
             if let predictedGlucose = context.predictedGlucose?.samples {
                 charts.predictedGlucosePoints = predictedGlucose.map {
@@ -209,7 +235,7 @@ class StatusViewController: UIViewController, NCWidgetProviding {
                         subtitleLabel.text = String(
                             format: NSLocalizedString(
                                 "Eventually %1$@ %2$@",
-                                comment: "The subtitle format describing eventual glucose. (1: localized glucose value description) (2: localized glucose units description)"),
+                                comment: "The subtitle format describing eventual glucose.  (1: localized glucose value description) (2: localized glucose units description)"),
                             eventualGlucoseNumberString,
                             unit.glucoseUnitDisplayString
                         )

Loop/Managers/StatusExtensionDataManager.swift

@@ -10,6 +10,7 @@ import HealthKit
 import UIKit
 import CarbKit
 import LoopKit
+import InsulinKit
 import LoopUI
 
 
@@ -134,6 +135,22 @@ final class StatusExtensionDataManager {
                 )
             }
 
+            updateGroup.enter()
+            manager.doseStore.insulinOnBoard(at: Date()) {(result) in
+                // This function completes asynchronously, so below
+                // is a completion that returns a value after eventual
+                // function completion.  Currently the time of update
+                // isn't used in the code, but could e.g. check how
+                // recent it is. 
+                switch result {
+                case .success(let iobValue):
+                    context.activeInsulin = iobValue.value                    
+                case .failure:
+                    context.activeInsulin = nil
+                }
+                updateGroup.leave()
+            }
+
             if let batteryPercentage = dataManager.pumpBatteryChargeRemaining {
                 context.batteryPercentage = batteryPercentage
             }