我需要在每个周一到周五提示。其他时间不提示。但是在NSCalendarUnit中没有找到相关的。

    NSCalendarUnitEra                = kCFCalendarUnitEra,     NSCalendarUnitYear               = kCFCalendarUnitYear,     NSCalendarUnitMonth              = kCFCalendarUnitMonth,     NSCalendarUnitDay                = kCFCalendarUnitDay,     NSCalendarUnitHour               = kCFCalendarUnitHour,     NSCalendarUnitMinute             = kCFCalendarUnitMinute,     NSCalendarUnitSecond             = kCFCalendarUnitSecond,     NSCalendarUnitWeekday            = kCFCalendarUnitWeekday,     NSCalendarUnitWeekdayOrdinal     = kCFCalendarUnitWeekdayOrdinal,     NSCalendarUnitQuarter            NS_ENUM_AVAILABLE(10_6, 4_0) = kCFCalendarUnitQuarter,     NSCalendarUnitWeekOfMonth        NS_ENUM_AVAILABLE(10_7, 5_0) = kCFCalendarUnitWeekOfMonth,     NSCalendarUnitWeekOfYear         NS_ENUM_AVAILABLE(10_7, 5_0) = kCFCalendarUnitWeekOfYear,     NSCalendarUnitYearForWeekOfYear  NS_ENUM_AVAILABLE(10_7, 5_0) = kCFCalendarUnitYearForWeekOfYear,     NSCalendarUnitNanosecond         NS_ENUM_AVAILABLE(10_7, 5_0) = (1 << 15),     NSCalendarUnitCalendar           NS_ENUM_AVAILABLE(10_7, 4_0) = (1 << 20),     NSCalendarUnitTimeZone           NS_ENUM_AVAILABLE(10_7, 4_0) = (1 << 21)