Remove redundant properties and methods in FSCalendarHeaderView.

FSCalendar/FSCalendar.m

@@ -864,8 +864,6 @@ typedef NS_ENUM(NSUInteger, FSCalendarOrientation) {
         _preferredWeekdayHeight = FSCalendarAutomaticDimension;
         _preferredRowHeight = FSCalendarAutomaticDimension;
         _preferredHeaderHeight = FSCalendarAutomaticDimension;
-        _calendarHeaderView.needsAdjustingMonthPosition = YES;
-        _calendarHeaderView.needsAdjustingViewFrame = YES;
         [self setNeedsLayout];
     }
 }
@@ -1506,7 +1504,6 @@ typedef NS_ENUM(NSUInteger, FSCalendarOrientation) {
     _preferredWeekdayHeight = FSCalendarAutomaticDimension;
     _preferredRowHeight     = FSCalendarAutomaticDimension;
     
-    [self.calendarHeaderView setNeedsAdjustingViewFrame:YES];
     [self setNeedsLayout];
     
 }
@@ -1527,7 +1524,6 @@ typedef NS_ENUM(NSUInteger, FSCalendarOrientation) {
     [self requestBoundingDatesIfNecessary];
     NSDate *targetPage = self.pagingEnabled?self.currentPage:(self.currentPage?:self.selectedDate);
     [self scrollToPageForDate:targetPage animated:NO];
-    self.calendarHeaderView.needsAdjustingMonthPosition = YES;
 }
 
 - (BOOL)requestBoundingDatesIfNecessary

FSCalendar/FSCalendarDynamicHeader.h

@@ -34,7 +34,6 @@
 @property (readonly, nonatomic) UIView *bottomBorder;
 
 @property (readonly, nonatomic) NSCalendar *gregorian;
-@property (readonly, nonatomic) NSDateComponents *components;
 @property (readonly, nonatomic) NSDateFormatter *formatter;
 
 @property (readonly, nonatomic) UIView *contentView;

FSCalendar/FSCalendarHeaderView.h

@@ -8,7 +8,6 @@
 
 #import <UIKit/UIKit.h>
 
-
 @class FSCalendar, FSCalendarAppearance, FSCalendarHeaderLayout, FSCalendarCollectionView;
 
 @interface FSCalendarHeaderView : UIView
@@ -17,12 +16,10 @@
 @property (weak, nonatomic) FSCalendarHeaderLayout *collectionViewLayout;
 @property (weak, nonatomic) FSCalendar *calendar;
 
-@property (assign, nonatomic) CGFloat scrollOffset;
 @property (assign, nonatomic) UICollectionViewScrollDirection scrollDirection;
 @property (assign, nonatomic) BOOL scrollEnabled;
-@property (assign, nonatomic) BOOL needsAdjustingViewFrame;
-@property (assign, nonatomic) BOOL needsAdjustingMonthPosition;
 
+- (void)setScrollOffset:(CGFloat)scrollOffset;
 - (void)setScrollOffset:(CGFloat)scrollOffset animated:(BOOL)animated;
 - (void)reloadData;
 - (void)configureAppearance;

FSCalendar/FSCalendarHeaderView.m

@@ -43,8 +43,6 @@
 
 - (void)initialize
 {
-    _needsAdjustingViewFrame = YES;
-    _needsAdjustingMonthPosition = YES;
     _scrollDirection = UICollectionViewScrollDirectionHorizontal;
     _scrollEnabled = YES;
     
@@ -67,34 +65,17 @@
 - (void)layoutSubviews
 {
     [super layoutSubviews];
-    
-    if (_needsAdjustingViewFrame) {
-        _needsAdjustingViewFrame = NO;
-        _collectionViewLayout.itemSize = CGSizeMake(1, 1);
-        [_collectionViewLayout invalidateLayout];
-        _collectionView.frame = CGRectMake(0, self.fs_height*0.1, self.fs_width, self.fs_height*0.9);
-    }
-    
-    if (_needsAdjustingMonthPosition) {
-        _needsAdjustingMonthPosition = NO;
-        [self scrollToOffset:_scrollOffset animated:NO];
-    }
-    
+    self.collectionView.frame = CGRectMake(0, self.fs_height*0.1, self.fs_width, self.fs_height*0.9);
 }
 
 - (void)dealloc
 {
-    _collectionView.dataSource = nil;
-    _collectionView.delegate = nil;
+    self.collectionView.dataSource = nil;
+    self.collectionView.delegate = nil;
 }
 
 #pragma mark - <UICollectionViewDataSource>
 
-- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
-{
-    return 1;
-}
-
 - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
 {
     NSInteger numberOfSections = self.calendar.collectionView.numberOfSections;
@@ -112,11 +93,6 @@
     return cell;
 }
 
-- (void)collectionView:(UICollectionView *)collectionView didEndDisplayingCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath
-{
-    [cell setNeedsLayout];
-}
-
 - (void)scrollViewDidScroll:(UIScrollView *)scrollView
 {
     [_collectionView.visibleCells makeObjectsPerformSelector:@selector(setNeedsLayout)];
@@ -137,9 +113,6 @@
 
 - (void)setScrollOffset:(CGFloat)scrollOffset animated:(BOOL)animated
 {
-    if (_scrollOffset != scrollOffset) {
-        _scrollOffset = scrollOffset;
-    }
     [self scrollToOffset:scrollOffset animated:NO];
 }
 
@@ -159,7 +132,6 @@
     if (_scrollDirection != scrollDirection) {
         _scrollDirection = scrollDirection;
         _collectionViewLayout.scrollDirection = scrollDirection;
-        _needsAdjustingMonthPosition = YES;
         [self setNeedsLayout];
     }
 }
@@ -251,7 +223,7 @@
 - (void)setBounds:(CGRect)bounds
 {
     [super setBounds:bounds];
-    _titleLabel.frame = bounds;
+    self.titleLabel.frame = bounds;
 }
 
 - (void)layoutSubviews
@@ -273,7 +245,6 @@
         CGFloat center = CGRectGetMidY(self.header.bounds);
         self.contentView.alpha = 1.0 - (1.0-self.header.calendar.appearance.headerMinimumDissolvedAlpha)*ABS(center-position)/self.fs_height;
     }
-    
 }
 
 @end
@@ -290,10 +261,16 @@
         self.minimumLineSpacing = 0;
         self.sectionInset = UIEdgeInsetsZero;
         self.itemSize = CGSizeMake(1, 1);
+        [NSNotificationCenter.defaultCenter addObserver:self selector:@selector(didReceiveOrientationChangeNotification:) name:UIDeviceOrientationDidChangeNotification object:nil];
     }
     return self;
 }
 
+- (void)dealloc
+{
+    [NSNotificationCenter.defaultCenter removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
+}
+
 - (void)prepareLayout
 {
     [super prepareLayout];
@@ -305,6 +282,11 @@
     
 }
 
+- (void)didReceiveOrientationChangeNotification:(NSNotification *)notificatino
+{
+    [self invalidateLayout];
+}
+
 - (BOOL)flipsHorizontallyInOppositeLayoutDirection
 {
     return YES;