Fix for screen rotation issue

BouncyPresent/Base.lproj/Main.storyboard

@@ -1,12 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14113" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14313.18" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="DiI-r2-A9v">
     <device id="retina4_7" orientation="portrait">
         <adaptation id="fullscreen"/>
     </device>
     <dependencies>
         <deployment identifier="iOS"/>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14088"/>
-        <capability name="Alignment constraints with different attributes" minToolsVersion="5.1"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14283.14"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
@@ -23,7 +22,7 @@
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="vgx-ZB-gk6" customClass="PaddedButton" customModule="BouncyPresent" customModuleProvider="target">
-                                <rect key="frame" x="105.5" y="353.5" width="165" height="48"/>
+                                <rect key="frame" x="105" y="353.5" width="165" height="48"/>
                                 <color key="backgroundColor" red="1" green="0.86195106580000003" blue="0.15694230179999999" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                 <fontDescription key="fontDescription" name="HelveticaNeue-Thin" family="Helvetica Neue" pointSize="22"/>
                                 <state key="normal" title="Bouncy Present">
@@ -53,10 +52,11 @@
                             <constraint firstItem="QBT-9x-GXJ" firstAttribute="centerX" secondItem="vgx-ZB-gk6" secondAttribute="centerX" id="mDQ-GV-4yC"/>
                         </constraints>
                     </view>
+                    <navigationItem key="navigationItem" id="623-m1-1yx"/>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="136" y="136"/>
+            <point key="canvasLocation" x="1074.4000000000001" y="135.38230884557723"/>
         </scene>
         <!--Overlay View Controller-->
         <scene sceneID="xfq-Ck-ZZV">
@@ -97,7 +97,25 @@
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="iri-wH-kqe" userLabel="First Responder" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="883" y="136"/>
+            <point key="canvasLocation" x="1821.5999999999999" y="135.38230884557723"/>
+        </scene>
+        <!--Navigation Controller-->
+        <scene sceneID="0hF-fn-IOI">
+            <objects>
+                <navigationController automaticallyAdjustsScrollViewInsets="NO" id="DiI-r2-A9v" sceneMemberID="viewController">
+                    <toolbarItems/>
+                    <navigationBar key="navigationBar" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" id="GRF-0G-dBA">
+                        <rect key="frame" x="0.0" y="20" width="375" height="44"/>
+                        <autoresizingMask key="autoresizingMask"/>
+                    </navigationBar>
+                    <nil name="viewControllers"/>
+                    <connections>
+                        <segue destination="BYZ-38-t0r" kind="relationship" relationship="rootViewController" id="A6q-Mm-aHc"/>
+                    </connections>
+                </navigationController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="rxW-Vv-SZs" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="327" y="135"/>
         </scene>
     </scenes>
 </document>

BouncyPresent/OverlayPresentationController.swift

@@ -36,6 +36,12 @@ class OverlayPresentationController: UIPresentationController {
   override func dismissalTransitionWillBegin() {
     presentedViewController.transitionCoordinator?.animate(alongsideTransition: { _ in
       self.dimmingView.alpha = 0.0
+
+      // This is a workaround for the bug(?) in UIPresentationController on iOS11 + iOS12
+      // whereby the frame of presentingViewController gets corrupted after screen rotation
+      self.presentingViewController.view.frame = CGRect(x: 0.0, y: 0.0,
+                                                        width: UIScreen.main.bounds.size.width,
+                                                        height: UIScreen.main.bounds.size.height)
     }) { _ in
       self.dimmingView.removeFromSuperview()
     }

BouncyPresent/ViewController.swift

@@ -26,7 +26,9 @@ class ViewController: UIViewController {
   }
 
   @IBAction func handleBouncyPresentPressed(sender: AnyObject) {
-    let overlayViewController = storyboard?.instantiateViewController(withIdentifier: "overlayViewController") as! UIViewController
+    guard let overlayViewController = storyboard?.instantiateViewController(withIdentifier: "overlayViewController") else {
+        fatalError("Unable to instantiate ViewController with identifier 'overlayViewController'")
+    }
     prepareOverlay(viewController: overlayViewController)
     present(overlayViewController, animated: true)
   }