iOS获取一个月所有天数

- (void) getAllDaysWithMonth
{
    NSUInteger dayCount = [self getInMonthNumberOfDays]; //一个月的总天数
    NSDateFormatter * formatter = [[NSDateFormatter alloc] init];
    NSDate * currentDate = [NSDate date];
    [formatter setDateFormat:@"yyyy-MM"];
    NSString * str = [formatter stringFromDate:currentDate];
    [formatter setDateFormat:@"yyyy-MM-dd"];
    for (NSInteger i = 1; i <= dayCount; i++) {
        NSString * sr = [NSString stringWithFormat:@"%@-%ld",str,i];
        [self.dateTimeArray addObject:sr];
    }
}```

// 获取当月的天数

• (NSInteger)getInMonthNumberOfDays
  {
  NSCalendar * calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
  NSDate * currentDate = [NSDate date];
  NSRange range = [calendar rangeOfUnit:NSCalendarUnitDay
  inUnit: NSCalendarUnitMonth
  forDate:currentDate];
  return range.length;
  }```

 (
    "2017-07-1",
    "2017-07-2",
    "2017-07-3",
    "2017-07-4",
    "2017-07-5",
    "2017-07-6",
    "2017-07-7",
    "2017-07-8",
    "2017-07-9",
    "2017-07-10",
    "2017-07-11",
    "2017-07-12",
    "2017-07-13",
    "2017-07-14",
    "2017-07-15",
    "2017-07-16",
    "2017-07-17",
    "2017-07-18",
    "2017-07-19",
    "2017-07-20",
    "2017-07-21",
    "2017-07-22",
    "2017-07-23",
    "2017-07-24",
    "2017-07-25",
    "2017-07-26",
    "2017-07-27",
    "2017-07-28",
    "2017-07-29",
    "2017-07-30",
    "2017-07-31"
)