自定义周日历(WeekCalender),左右滑动,可扩展性高,使用简单,会一直优化,扩展

用法:
1.初始化FFWeekCalender
FFWeekCalender *weekCalender = [[FFWeekCalender alloc] initWithFrame:frame];
2.设置currentDate属性,初始化日历显示的当前日期,不选默认是当天
weekCalender.currentDate = [NSDate date];
3.更新日历
- (void)reloadCalender;
4.weekCalender.chooseDates选择多个日期标记.它是个数组,元素是NSDate
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