NSCalendar *calendar =[[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
[calendarsetFirstWeekday:2];//周一开始
[calendarsetMinimumDaysInFirstWeek:1];
NSRange range = [calendar rangeOfUnit:NSCalendarUnitWeekOfYear inUnit:NSCalendarUnitMonth forDate:clickOndate];//clickOndate 你要确定某个月份先输入这个月份的日期
self.newWeekDisplay= range.length;//周数