Question

我将按步骤解释我的问题：

我的NSArray里面有NSDictionaries。
每个NSDictionary都有一个NSDate和一个NSNumber（2个键/ 2个值）。
我想用动态部分和动态行每个部分
UITableView的每个部分必须按周时间顺序排列（使用NSCalendar）。
每一行的每一行必须按时间顺序排列（按周）。

现在，我已经使用NSCalendar来查找每个Dictionary进入哪个星期，并且我已经设法通过此代码动态地找出我所拥有的部分（周）的行数（天数/消息）：

NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *dateComponents = [calendar components:NSWeekCalendarUnit fromDate:[NSDate date]];
    NSMutableArray *tempArray = [NSMutableArray  new];
    NSNumber *weekNumber; int countDictionary = 0;

    if (!_sectionsDetailed)
        _sectionsDetailed = [NSMutableArray new];
    if (!_sections)
        _sections = [NSMutableArray new];
    if (!_sectionsDictionary)
        _sectionsDictionary = [NSMutableDictionary new];

    for (NSDictionary *dictionary in _historyArray)
    {
        ++countDictionary;
        dateComponents = [calendar components:NSWeekCalendarUnit fromDate:[dictionary objectForKey:@"messageDate"]];
        weekNumber = [NSNumber numberWithInteger:[dateComponents week]];

        [_sectionsDetailed addObject:weekNumber];

        DLog(@"DICTIONARY NUMBER: %i - WEEK NUMBER: %@", countDictionary, weekNumber);
    }

从那里我得到以下输出（我有4个部分（周）的9条消息（行/天））：

DICTIONARY NUMBER: 1 - WEEK NUMBER: 5
DICTIONARY NUMBER: 2 - WEEK NUMBER: 5
DICTIONARY NUMBER: 3 - WEEK NUMBER: 5 
DICTIONARY NUMBER: 4 - WEEK NUMBER: 3
DICTIONARY NUMBER: 5 - WEEK NUMBER: 3
DICTIONARY NUMBER: 6 - WEEK NUMBER: 2
DICTIONARY NUMBER: 7 - WEEK NUMBER: 2
DICTIONARY NUMBER: 8 - WEEK NUMBER: 1
DICTIONARY NUMBER: 9 - WEEK NUMBER: 1

然后，为了只有一个星期的单个实例，我使用NSBag计算部分（周）：

NSBag *arrayCounter = [NSBag bag];

for (id section in _sectionsDetailed)
{
    [arrayCounter add:section];
}
for (id uniqueSection in arrayCounter.objects)
{
    [tempArray addObject:uniqueSection];
    [_sectionsDictionary setObject:[NSNumber numberWithInteger:[arrayCounter occurrencesOf:uniqueSection]] forKey:uniqueSection];
    DLog(@"WEEK:%@, MESSAGES/WEEK:%i", uniqueSection, [arrayCounter occurrencesOf:uniqueSection]);
}

计数的输出是：

WEEK:5, MESSAGES/WEEK:3
WEEK:3, MESSAGES/WEEK:2
WEEK:1, MESSAGES/WEEK:2
WEEK:2, MESSAGES/WEEK:2

我的问题是：由于我需要填充UITableView的Sections和Rows，如何创建一个嵌套的NSArray或NSMutableArray来包含这样的方案：

completeArray:
             > Week 1 (section 1) [ARRAY]:
                                  > Message 1 (row 1 / day 1 in week 1/section1) [DICT]
                                  > Message 2 (row 2 / day 2 in week 1/section1) [DICT]
             > Week 2 (section 2) [ARRAY]:
                                  > Message 1 (row 1 / day 1 in week 2/section2) [DICT]
                                  > Message 2 (row 2 / day 2 in week 2/section2) [DICT]
and so on...     .
                 .
                 .

我尝试使用以下代码获取所需的结果：

   for (id section in _sections)
    {
        for (id dictionary in _historyArray)
        {
            dateComponents = [calendar components:NSWeekCalendarUnit fromDate:[dictionary objectForKey:@"messageDate"]];
            weekNumber = [NSNumber numberWithInteger:[dateComponents week]];
            if (section == weekNumber)
            {
              DLog(@"Section %@ - Dict %@",section, dictionary);
            }
        }
    }

但是我一直在寻找一个解决方案来检查哪一行进入哪个部分......

上面的输出是：

Section 5 - Dict {
    messageDate = "2013-02-01 11:06:41 +0000";
    messageNumber = 50;
}
Section 5 - Dict {
    messageDate = "2013-02-01 11:06:40 +0000";
    messageNumber = 1;
}
Section 5 - Dict {
    messageDate = "2013-02-01 11:06:39 +0000";
    messageNumber = 52;
}
Section 3 - Dict {
    messageDate = "2013-01-18 09:18:47 +0000";
    messageNumber = 88;
}
Section 3 - Dict {
    messageDate = "2013-01-18 09:18:46 +0000";
    messageNumber = 58;
}
Section 2 - Dict {
    messageDate = "2013-01-11 09:18:24 +0000";
    messageNumber = 45;
}
 Section 2 - Dict {
    messageDate = "2013-01-11 09:18:06 +0000";
    messageNumber = 35;
}
Section 1 - Dict {
    messageDate = "2013-01-04 09:17:40 +0000";
    messageNumber = 30;
}
Section 1 - Dict {
    messageDate = "2013-01-04 08:16:40 +0000";
    messageNumber = 53;
}

如果可以，请帮帮我。我将非常感谢你的帮助！谢谢！

Answer 1

好的，所以你现在拥有数据结构的方式使你想做的事几乎不可能。事实上，有很多更简单的方法来完成这里所做的事情。

因此，不要在数组中保留所有这些字典（如果我们在挑剔时真的应该成为一个消息类），请尝试按照键的行为“周＃”创建一个NSDictionary，值为一组消息（或者在本例中是字典）。

然后填充TableView，numberOfSections = [[aDictionary allKeys] count] ...然后枚举这些部分。并且每个部分的numberOfRows = [[aDictionary objectForKey：aSection] count]，这将为您提供本周的消息数组，然后您可以枚举数组。（希望这一点得到解决......对我而言非常草率抱歉）

您遇到的问题是可以通过使用正确类型的数据结构轻松避免的问题，TableView是一个二维数组，您试图单独填充它的每个元素而不是匹配数据结构这让你很头疼，因为你可能知道哈哈

Answer 2

对于迟到的回答（我没有时间）抱歉，我想出了以下解决方案：谢谢Jeremy的帮助！这是在你的帮助下完成的。

- (void) archiveRecord
{
    NSDate *currentDate = [NSDate date];
    NSNumber *currentMessageNumber = [NSNumber numberWithInt:_generatedNumber];

    NSDictionary *currentMessageDictionary = [[NSDictionary alloc] initWithObjectsAndKeys:currentMessageNumber,@"messageNumber", currentDate,@"messageDate", nil];    
    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *currentMessageDateComponents;
    NSDateComponents *historyMessageDateComponents;
    currentWeekNumber = 0;
    historyWeekNumber = 0;

    currentMessageDateComponents = [calendar components:NSWeekCalendarUnit fromDate:currentDate];
    currentWeekNumber = [currentMessageDateComponents week];

    if (historyExists)
    {
      for (NSMutableArray *sectionArray in [_messageHistory objectAtIndex:0])
      {
          DLog(@"SECTIONARRAY: %@", sectionArray);
          DLog(@"DICTIONARY NUMBER: %@", [sectionArray valueForKey:@"messageNumber"]);
          historyMessageDateComponents = [calendar components:NSWeekCalendarUnit fromDate:[sectionArray valueForKey:@"messageDate"]];
          historyWeekNumber = [historyMessageDateComponents week];

          if (historyWeekNumber == currentWeekNumber)
          {
              DLog(@"ADD MESSAGE TO CURRENT WEEK");
              [[_messageHistory objectAtIndex:0] insertObject:currentMessageDictionary atIndex:0];
              break;
          }
          else
          {
              DLog(@"NEW SECTION NEEDED: CREATE NEW SECTION AND ADD MESSAGE");
              [_messageHistory insertObject:[NSMutableArray arrayWithObjects:currentMessageDictionary, nil] atIndex:0];
              break;
          }
       }
    }
    else
    {
        DLog(@"CREATE NEW SECTION AND ADD MESSAGE");
        [_messageHistory addObject:[NSMutableArray arrayWithObjects:currentMessageDictionary, nil]];
    }
    DLog(@"CURRENT HISTORY: %@", _messageHistory);
    [self performSelector:@selector(writeRecordToFile)];
}

为UITableView动态嵌套NSMutableArrays或NSArrays

2 个答案: