Limit the sample to portrait to fix #12521

CustomCollectionViewLayoutAttributes/Info.plist

@@ -20,6 +20,8 @@
 		<string>Resources/icon-100.png</string>
 	</array>
 	<key>UISupportedInterfaceOrientations~ipad</key>
-	<array/>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+	</array>
 </dict>
 </plist>