Fixed iOS testapp dark mode (#4812)

* Fixed iOS testapp dark mode

* Fixed dark mode display on normal GDT iOS testapp

* Fix unwrapping an optional for the GDT macOS test app

Co-authored-by: Michael Haney <mikehaney24@users.noreply.github.com>

GoogleDataTransport/GDTTestApp/app.swift

@@ -44,6 +44,6 @@ import GoogleDataTransport
   }
 
   public class ViewController: NSViewController {
-    let transport: GDTCORTransport = GDTCORTransport(mappingID: "1234", transformers: nil, target: GDTCORTarget.test.rawValue)
+    let transport: GDTCORTransport = GDTCORTransport(mappingID: "1234", transformers: nil, target: GDTCORTarget.test.rawValue)!
   }
 #endif

GoogleDataTransport/GDTTestApp/ios/Main.storyboard

@@ -1,11 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14490.70" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
-    <device id="retina6_1" orientation="portrait">
-        <adaptation id="fullscreen"/>
-    </device>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="15702" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+    <device id="retina6_1" orientation="portrait" appearance="dark"/>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14490.49"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="15704"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
@@ -22,7 +20,7 @@
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="674-uo-mtw">
-                                <rect key="frame" x="20" y="74" width="555" height="55"/>
+                                <rect key="frame" x="20" y="98" width="369" height="55"/>
                                 <color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                 <constraints>
                                     <constraint firstAttribute="height" constant="55" id="xfr-R6-SiR"/>
@@ -35,7 +33,7 @@
                                 </connections>
                             </button>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="FD9-Mn-in7">
-                                <rect key="frame" x="20" y="137" width="555" height="55"/>
+                                <rect key="frame" x="20" y="161" width="369" height="55"/>
                                 <color key="backgroundColor" white="0.66666666669999997" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                 <constraints>
                                     <constraint firstAttribute="height" constant="55" id="0Uy-Mh-vns"/>
@@ -48,7 +46,7 @@
                                 </connections>
                             </button>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="IFu-Rf-wNA">
-                                <rect key="frame" x="20" y="200" width="555" height="55"/>
+                                <rect key="frame" x="20" y="224" width="369" height="55"/>
                                 <color key="backgroundColor" white="0.66666666669999997" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                 <constraints>
                                     <constraint firstAttribute="height" constant="55" id="SQB-HZ-Idj"/>
@@ -61,7 +59,7 @@
                                 </connections>
                             </button>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="yTs-B1-Yoh">
-                                <rect key="frame" x="20" y="263" width="555" height="55"/>
+                                <rect key="frame" x="20" y="287" width="369" height="55"/>
                                 <color key="backgroundColor" white="0.66666666669999997" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                 <constraints>
                                     <constraint firstAttribute="height" constant="55" id="GCn-oJ-52K"/>
@@ -74,13 +72,13 @@
                                 </connections>
                             </button>
                             <label opaque="NO" userInteractionEnabled="NO" contentMode="center" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="GoogleDataTransport Test App" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="L83-mC-jNW">
-                                <rect key="frame" x="20" y="28" width="236" height="21"/>
+                                <rect key="frame" x="20" y="52" width="236" height="21"/>
                                 <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                 <nil key="textColor"/>
                                 <nil key="highlightedColor"/>
                             </label>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="QpN-cI-JZa">
-                                <rect key="frame" x="20" y="326" width="555" height="55"/>
+                                <rect key="frame" x="20" y="350" width="369" height="55"/>
                                 <color key="backgroundColor" white="0.66666666669999997" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                 <constraints>
                                     <constraint firstAttribute="height" constant="55" id="U3o-sp-jte"/>
@@ -93,7 +91,7 @@
                                 </connections>
                             </button>
                         </subviews>
-                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <color key="backgroundColor" cocoaTouchSystemColor="groupTableViewBackgroundColor"/>
                         <constraints>
                             <constraint firstItem="FD9-Mn-in7" firstAttribute="trailing" secondItem="674-uo-mtw" secondAttribute="trailing" id="6RX-nn-nw3"/>
                             <constraint firstItem="FD9-Mn-in7" firstAttribute="leading" secondItem="674-uo-mtw" secondAttribute="leading" id="6rB-CC-4ri"/>

GoogleDataTransportCCTSupport/GDTCCTTestApp/ios/Main.storyboard

@@ -27,6 +27,7 @@
                             </label>
                             <segmentedControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="top" segmentControlStyle="plain" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="9fC-1b-Rvu">
                                 <rect key="frame" x="20" y="37" width="140" height="32"/>
+                                <color key="backgroundColor" systemColor="opaqueSeparatorColor" red="0.77647058820000003" green="0.77647058820000003" blue="0.7843137255" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                 <segments>
                                     <segment title="CCT"/>
                                     <segment title="FLL"/>
@@ -100,7 +101,7 @@
                                 </connections>
                             </button>
                         </subviews>
-                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <color key="backgroundColor" cocoaTouchSystemColor="groupTableViewBackgroundColor"/>
                         <constraints>
                             <constraint firstItem="674-uo-mtw" firstAttribute="leading" secondItem="FD9-Mn-in7" secondAttribute="leading" id="2MG-RM-cIL"/>
                             <constraint firstItem="yTs-B1-Yoh" firstAttribute="leading" secondItem="QpN-cI-JZa" secondAttribute="leading" id="3AV-qq-ttG"/>