Make selectedDate writable

Make selectedDate writable

Example/FSCalendar/ViewController.m

@@ -31,6 +31,11 @@
     [super viewDidLoad];
     _currentCalendar = [NSCalendar currentCalendar];
     _flow = _calendar.flow;
+    
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        _calendar.selectedDate = [[NSDate date] fs_dateByAddingMonths:1];
+    });
+    
 }
 
 #pragma mark - FSCalendarDataSource

Pod/Classes/FSCalendar.h

@@ -60,8 +60,8 @@ typedef NS_OPTIONS(NSInteger, FSCalendarCellState) {
 @property (weak, nonatomic) IBOutlet FSCalendarHeader *header;
 
 @property (copy,     nonatomic) NSDate *currentDate;
+@property (copy,     nonatomic) NSDate *selectedDate;
 @property (readonly, nonatomic) NSDate *currentMonth;
-@property (readonly, nonatomic) NSDate *selectedDate;
 
 @property (assign, nonatomic) FSCalendarFlow flow;
 @property (assign, nonatomic) FSCalendarCellStyle cellStyle UI_APPEARANCE_SELECTOR;

Pod/Classes/FSCalendar.m

@@ -39,7 +39,7 @@
 @property (strong, nonatomic) NSMutableArray *weekdays;
 
 @property (strong, nonatomic) NSDate *currentMonth;
-@property (strong, nonatomic) NSDate *selectedDate;
+//@property (strong, nonatomic) NSDate *selectedDate;
 
 @property (strong, nonatomic) NSMutableDictionary *backgroundColors;
 @property (strong, nonatomic) NSMutableDictionary *titleColors;
@@ -53,7 +53,7 @@
 - (NSDate *)dateForIndexPath:(NSIndexPath *)indexPath;
 - (NSIndexPath *)indexPathForDate:(NSDate *)date;
 
-- (void)scrollToCurrentDate;
+- (void)scrollToDate:(NSDate *)date;
 
 @end
 
@@ -187,7 +187,7 @@
 - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
 {
     if ([keyPath isEqualToString:@"contentSize"]) {
-        [self scrollToCurrentDate];
+        [self scrollToDate:_currentDate];
         [_collectionView removeObserver:self forKeyPath:@"contentSize"];
     }
 }
@@ -239,7 +239,7 @@
         [_collectionView setContentOffset:destOffset animated:YES];
     }
     [cell showAnimation];
-    self.selectedDate = cell.date;
+    _selectedDate = cell.date;
     [self didSelectDate:cell.date];
 }
 
@@ -267,11 +267,6 @@
     self.currentMonth = currentMonth;
 }
 
-- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
-{
-    
-}
-
 #pragma mark - Setter & Getter
 
 - (void)setFlow:(FSCalendarFlow)flow
@@ -311,6 +306,15 @@
     return (FSCalendarFlow)_collectionViewFlowLayout.scrollDirection;
 }
 
+- (void)setSelectedDate:(NSDate *)selectedDate
+{
+    if (![_selectedDate isEqualToDate:selectedDate]) {
+        _selectedDate = [selectedDate copy];
+        [self scrollToDate:_selectedDate];
+        [_collectionView selectItemAtIndexPath:[self indexPathForDate:_selectedDate] animated:NO scrollPosition:UICollectionViewScrollPositionNone];
+    }
+}
+
 - (void)setWeekdayFont:(UIFont *)weekdayFont
 {
     if (_weekdayFont != weekdayFont) {
@@ -340,7 +344,7 @@
     if (![_currentDate isEqualToDate:currentDate]) {
         _currentDate = [currentDate copy];
         _currentMonth = [currentDate copy];
-        [self scrollToCurrentDate];
+        [self scrollToDate:_currentDate];
     }
 }
 
@@ -607,16 +611,16 @@
 
 #pragma mark - Private
 
-- (void)scrollToCurrentDate
+- (void)scrollToDate:(NSDate *)date
 {
-    NSInteger scrollOffset = [_currentDate fs_monthsFrom:[NSDate dateWithTimeIntervalSince1970:0]];
-    scrollOffset += _currentDate.fs_day == 1;
+    NSInteger scrollOffset = [date fs_monthsFrom:[NSDate dateWithTimeIntervalSince1970:0]];
+    scrollOffset += date.fs_day == 1;
     if (self.flow == FSCalendarFlowHorizontal) {
-        _collectionView.bounds = CGRectOffset(_collectionView.bounds,
+        _collectionView.bounds = CGRectOffset(self.bounds,
                                               scrollOffset * _collectionView.fs_width,
                                               0);
     } else if (self.flow == FSCalendarFlowVertical) {
-        _collectionView.bounds = CGRectOffset(_collectionView.bounds,
+        _collectionView.bounds = CGRectOffset(self.bounds,
                                               0,
                                               scrollOffset * _collectionView.fs_height);
     }