Work magic numbers out of Adaptive Panel (Custom Layout Guide) example (#412)

Author: warpling

Examples/Samples/Sources/Base.lproj/Main.storyboard

@@ -352,6 +352,7 @@
                         <outlet property="footerView" destination="SEa-7Y-wa9" id="Gzj-dP-YXl"/>
                         <outlet property="headerView" destination="t7x-eG-MKh" id="njM-un-U8q"/>
                         <outlet property="scrollView" destination="kRA-qy-GpJ" id="iWC-o4-APi"/>
+                        <outlet property="stackView" destination="Gs4-S6-Goh" id="f1D-bO-mjr"/>
                     </connections>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="pnR-69-Ek4" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>

Examples/Samples/Sources/ViewController.swift

@@ -47,7 +47,7 @@ class SampleListViewController: UIViewController {
             case .showNavigationController: return "Show Navigation Controller"
             case .showTopPositionedPanel: return "Show Top Positioned Panel"
             case .showAdaptivePanel: return "Show Adaptive Panel"
-            case .showAdaptivePanelWithCustomGuide: return "Show Adaptive Panel(Custom Layout Guide)"
+            case .showAdaptivePanelWithCustomGuide: return "Show Adaptive Panel (Custom Layout Guide)"
             }
         }
 
@@ -1348,6 +1348,7 @@ class ImageViewController: UIViewController {
     @IBOutlet weak var headerView: UIView!
     @IBOutlet weak var footerView: UIView!
     @IBOutlet weak var scrollView: UIScrollView!
+    @IBOutlet weak var stackView: UIStackView!
 
     enum Mode {
         case onlyImage
@@ -1366,12 +1367,14 @@ class ImageViewController: UIViewController {
             self.footerView.isHidden = false
             let guide = UILayoutGuide()
             view.addLayoutGuide(guide)
-            // 49 is the height of header and footer
+
             NSLayoutConstraint.activate([
-                guide.topAnchor.constraint(equalTo: scrollView.contentLayoutGuide.topAnchor, constant: -49),
-                guide.leftAnchor.constraint(equalTo: scrollView.contentLayoutGuide.leftAnchor),
-                guide.bottomAnchor.constraint(equalTo: scrollView.contentLayoutGuide.bottomAnchor, constant: 49),
-                guide.rightAnchor.constraint(equalTo: scrollView.contentLayoutGuide.rightAnchor),
+                scrollView.heightAnchor.constraint(equalTo: scrollView.contentLayoutGuide.heightAnchor),
+
+                guide.topAnchor.constraint(equalTo: stackView.topAnchor),
+                guide.leftAnchor.constraint(equalTo: stackView.leftAnchor),
+                guide.bottomAnchor.constraint(equalTo: stackView.bottomAnchor),
+                guide.rightAnchor.constraint(equalTo: stackView.rightAnchor),
             ])
             return guide
         }