iOS 断当前时间是否在一天的某个时间段内。

/**
 * @brief 判断当前时间是否在fromHour和toHour之间。如，fromHour=8，toHour=23时，即为判断当前时间是否在8:00-23:00之间
 */
- (BOOL)isBetweenFromHour:(NSInteger)fromHour toHour:(NSInteger)toHour
{
  NSDate *date8 = [self getCustomDateWithHour:8];
  NSDate *date23 = [self getCustomDateWithHour:23];
  
  NSDate *currentDate = [NSDate date];
  
  if ([currentDate compare:date8]==NSOrderedDescending && [currentDate compare:date23]==NSOrderedAscending)
  {
    NSLog(@"该时间在 %d:00-%d:00 之间！", fromHour, toHour);
    return YES;
  }
  return NO;
}

/**
 * @brief 生成当天的某个点（返回的是伦敦时间，可直接与当前时间[NSDate date]比较）
 * @param hour 如hour为“8”，就是上午8:00（本地时间）
 */
- (NSDate *)getCustomDateWithHour:(NSInteger)hour
{
  //获取当前时间
  NSDate *currentDate = [NSDate date];
  NSCalendar *currentCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
  NSDateComponents *currentComps = [[NSDateComponents alloc] init];
  
  NSInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekdayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
  
  currentComps = [currentCalendar components:unitFlags fromDate:currentDate];
  
  //设置当天的某个点
  NSDateComponents *resultComps = [[NSDateComponents alloc] init];
  [resultComps setYear:[currentComps year]];
  [resultComps setMonth:[currentComps month]];
  [resultComps setDay:[currentComps day]];
  [resultComps setHour:hour];
  
  NSCalendar *resultCalendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
  return [resultCalendar dateFromComponents:resultComps];
}