Make sure Pesto header logo is centered on rotate

Reviewers: traviskaufman, #material_components_ios_owners, ajsecord

Reviewed By: #material_components_ios_owners, ajsecord

Projects: #material_components_ios

Differential Revision: http://codereview.cc/D132

Author: Junius Gunaratne

demos/Pesto/Pesto.xcodeproj/project.pbxproj

@@ -112,25 +112,25 @@
 				DEBEDF301C3EF5D5004B614B /* Main.storyboard */,
 				DEBEDF2A1C3EF5D5004B614B /* PestoAppDelegate.h */,
 				DEBEDF2B1C3EF5D5004B614B /* PestoAppDelegate.m */,
+				C91F6A481C62BC0400EB4BA8 /* PestoAvatarView.h */,
+				C91F6A491C62BC0400EB4BA8 /* PestoAvatarView.m */,
 				DE381E181C457CE300019C1D /* PestoCardCollectionViewCell.h */,
 				DE381E191C457CEE00019C1D /* PestoCardCollectionViewCell.m */,
+				DE3620631C73A0710026DF5D /* PestoCollectionViewController.h */,
+				DE3620641C73A0850026DF5D /* PestoCollectionViewController.m */,
+				DEA791011C751D00006301CC /* PestoData.h */,
+				DEA791021C751D0D006301CC /* PestoData.m */,
 				DE5EF8651C404DFD00D2D4B9 /* PestoDetailViewController.h */,
 				DE5EF8661C404E0E00D2D4B9 /* PestoDetailViewController.m */,
-				DE381E3E1C45A9FB00019C1D /* PestoSideView.h */,
-				DE381E3F1C45A9FB00019C1D /* PestoSideView.m */,
-				C9A855291C4EDFAA003CADF7 /* PestoSettingsViewController.h */,
-				C9A8552A1C4EDFAA003CADF7 /* PestoSettingsViewController.m */,
-				C91F6A481C62BC0400EB4BA8 /* PestoAvatarView.h */,
-				C91F6A491C62BC0400EB4BA8 /* PestoAvatarView.m */,
+				DEA791061C752B74006301CC /* PestoFlexibleHeaderContainerViewController.h */,
+				DEA791041C752B6A006301CC /* PestoFlexibleHeaderContainerViewController.m */,
 				C91F6A4E1C63A80F00EB4BA8 /* PestoRemoteImageService.h */,
 				C91F6A4F1C63A80F00EB4BA8 /* PestoRemoteImageService.m */,
-				DEA791011C751D00006301CC /* PestoData.h */,
-				DEA791021C751D0D006301CC /* PestoData.m */,
+				C9A855291C4EDFAA003CADF7 /* PestoSettingsViewController.h */,
+				C9A8552A1C4EDFAA003CADF7 /* PestoSettingsViewController.m */,
+				DE381E3E1C45A9FB00019C1D /* PestoSideView.h */,
+				DE381E3F1C45A9FB00019C1D /* PestoSideView.m */,
 				DEBEDF271C3EF5D5004B614B /* Supporting Files */,
-				DE3620631C73A0710026DF5D /* PestoCollectionViewController.h */,
-				DE3620641C73A0850026DF5D /* PestoCollectionViewController.m */,
-				DEA791061C752B74006301CC /* PestoFlexibleHeaderContainerViewController.h */,
-				DEA791041C752B6A006301CC /* PestoFlexibleHeaderContainerViewController.m */,
 			);
 			path = Pesto;
 			sourceTree = "<group>";

demos/Pesto/Pesto/PestoCollectionViewController.m

@@ -55,6 +55,15 @@ - (BOOL)prefersStatusBarHidden {
   return YES;
 }
 
+- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
+                                         duration:(NSTimeInterval)duration {
+  CGRect headerFrame = _flexHeaderContainerVC.headerViewController.headerView.bounds;
+  _logoView.center = CGPointMake(headerFrame.size.width / 2.f,
+                                 headerFrame.size.height / 2.f);
+  _logoSmallView.center = CGPointMake(headerFrame.size.width / 2.f,
+                                      headerFrame.size.height / 2.f);
+}
+
 #pragma mark - UICollectionViewDataSource
 
 - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView