iSO获取两个日期之间的所有日期数组，精确到天

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- (void)viewDidLoad {

    [superviewDidLoad];

    NSArray *datearr = [selfgetDayArrayLeftDate:@"2017年01月01日"rightDate:@"2017年01月05日"];

}

//获取两个日期之间的所有日期，精确到天

- (NSArray *)getDayArrayLeftDate:(NSString *)aLeftDateStr rightDate:(NSString *)aRightDateStr{

    NSDateFormatter *dateFormatter = [[NSDateFormatteralloc]init];

    [dateFormatter setDateFormat: @"yyyy年MM月dd日"];

    NSDate *aLeftDate = [dateFormatter dateFromString:aLeftDateStr];

    NSDate *aRightDate = [dateFormatter dateFromString:aRightDateStr];

    if (aLeftDate == aRightDate) {

        NSCalendar *gregorian = [[NSCalendaralloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

        NSDateComponents *components = [gregoriancomponents:NSCalendarUnitWeekday |NSCalendarUnitYear | NSCalendarUnitMonth |NSCalendarUnitDayfromDate:aLeftDate];

        NSDate *beginningOfWeek = [gregorian dateFromComponents:components];

        NSDateFormatter *dateday = [[NSDateFormatteralloc]init];

        [dateday setDateFormat:@"yyyy-MM-dd"];

        NSString *currentDateStr = [dateday stringFromDate:beginningOfWeek];

        return @[currentDateStr];

    }

    

    NSMutableArray *dayArray = [NSMutableArrayarrayWithCapacity:0];

    NSDate *currentDate = aLeftDate;

    

    NSCalendar *gregorian = [[NSCalendaralloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian];

    NSDateComponents *components = [gregoriancomponents:NSCalendarUnitWeekday |NSCalendarUnitYear | NSCalendarUnitMonth |NSCalendarUnitDayfromDate:currentDate];

    while (currentDate < aRightDate) {

        NSDate *beginningOfWeek = [gregorian dateFromComponents:components];

        currentDate = beginningOfWeek;

        NSDateFormatter *dateday = [[NSDateFormatteralloc]init];

        [dateday setDateFormat:@"yyyy-MM-dd"];

        NSString *currentDateStr = [dateday stringFromDate:beginningOfWeek];

        [dayArray addObject:currentDateStr];

        

        [components setDay:([components day]+1)];

    }

    return dayArray;

}