Appearance : add `headerSeparatorColor` property

FSCalendar/FSCalendarAppearance.h

@@ -108,6 +108,11 @@ typedef NS_OPTIONS(NSUInteger, FSCalendarCaseOptions) {
  */
 @property (strong, nonatomic) UIColor  *headerTitleColor;
 
+/**
+ * The color oh month header separator
+ */
+@property (strong, nonatomic) UIColor  *headerSeparatorColor;
+
 /**
  * The date format of the month header.
  */

FSCalendar/FSCalendarAppearance.m

@@ -36,6 +36,7 @@
         _headerTitleFont = [UIFont systemFontOfSize:FSCalendarStandardHeaderTextSize];
         
         _headerTitleColor = FSCalendarStandardTitleTextColor;
+        _headerSeparatorColor = FSCalendarStandardLineColor;
         _headerDateFormat = @"MMMM yyyy";
         _headerMinimumDissolvedAlpha = 0.2;
         _weekdayTextColor = FSCalendarStandardTitleTextColor;
@@ -409,6 +410,14 @@
     }
 }
 
+- (void)setHeaderSeparatorColor:(UIColor *)headerSeparatorColor
+{
+    if (![_headerSeparatorColor isEqual:headerSeparatorColor]) {
+        _headerSeparatorColor = headerSeparatorColor;
+        [self.calendar configureAppearance];
+    }
+}
+
 - (void)setHeaderMinimumDissolvedAlpha:(CGFloat)headerMinimumDissolvedAlpha
 {
     if (_headerMinimumDissolvedAlpha != headerMinimumDissolvedAlpha) {

FSCalendar/FSCalendarStickyHeader.m

@@ -95,6 +95,7 @@
     _titleLabel.font = self.calendar.appearance.headerTitleFont;
     _titleLabel.textColor = self.calendar.appearance.headerTitleColor;
     _titleLabel.textAlignment = self.calendar.appearance.headerTitleAlignment;
+    _bottomBorder.backgroundColor = self.calendar.appearance.headerSeparatorColor;
     [self.weekdayView configureAppearance];
 }