日期的星期操作

/**
*  判断日期是当月的星期几
*/
typedef NS_ENUM(NSUInteger, LDYDateWeekType) {
/**
*  星期一
*/
LDYDateWeekTypeMonday =1,
/**
*  星期二
*/
LDYDateWeekTypeTuesday,
/**
*  星期三
*/
LDYDateWeekTypeWednesday,
/**
*  星期四
*/
LDYDateWeekTypeThursday,
/**
*  星期五
*/
LDYDateWeekTypeFriday,
/**
*  星期六
*/
LDYDateWeekTypeSaturday,
/**
*  星期日
*/
LDYDateWeekTypeSunday
};

-(LDYDateWeekType)ldy_weekType {
//计算week数
NSCalendar *calendar = [NSCalendar currentCalendar];
calendar.timeZone = [NSTimeZone defaultTimeZone];
NSInteger week = [[calendar components:NSCalendarUnitWeekday fromDate:self] weekday];
LDYDateWeekType type;
switch (week) {
case 1:
type = LDYDateWeekTypeSunday;
break;
case 2:
type = LDYDateWeekTypeMonday;
break;
case 3:
type = LDYDateWeekTypeTuesday;
break;
case 4:
type = LDYDateWeekTypeWednesday;
break;
case 5:
type = LDYDateWeekTypeThursday;
break;
case 6:
type = LDYDateWeekTypeFriday;
break;
case 7:
type = LDYDateWeekTypeSaturday;
break;
default:
break;
}
return type;
}

-(BOOL)ldy_isWeekType:(LDYDateWeekType)type {
return [self ldy_weekType] == type ?YES:NO;
}

-(NSDate *)ldy_JupmToWeekType:(LDYDateWeekType)targetType {
LDYDateWeekType currentType = [self ldy_weekType];
if (currentType == targetType) {
return self;
}
NSInteger interval = targetType - currentType;
interval = interval>=0 ? interval:-interval;
return [self ldy_dateByAddingDays:interval];
}