iPhone SDK：分组 UITableView 部分，列表项未显示在正确的部分下

Question

我有一个分组的 uitableview，它有几个部分。这些部分显示良好并且行数正确，但是列表项的定位存在问题。我有一个带有名称列表的 NSMutableArray，然后使用 subArrayWithRange 拆分该数组。请参阅代码了解更多详细信息。问题是列表项没有出现在正确的部分下，我似乎找不到解决方案。

在 cellForRowAtIndexPath 中：

NSInteger section = [indexPath section];
    NSString *sectionName = [sectionNamesArray objectAtIndex:section];
    NSCountedSet *set = [[NSCountedSet alloc] initWithArray:townArray];
    int numOfRows = [set countForObject:[NSString stringWithFormat:@"%@",sectionName]];
    int initNumRows = [set countForObject:[NSString stringWithFormat:@"%@",[sectionNamesArray objectAtIndex:0]]];

if(section == 0) {

    NSRange range = NSMakeRange(0,numOfRows);

    NSArray *subArray = [[namesArray subarrayWithRange:range] retain];
        NSArray *subTownArray = [[townArray subarrayWithRange:range]retain];
        //indexTracker = indexPath.row;

    //NSLog(@"sub array === %@, index Tracker = %i",subArray,indexTracker);
        cell.primaryLabel.text = [subArray objectAtIndex:indexPath.row];
        cell.secondaryLabel.text = [subTownArray objectAtIndex:indexPath.row];
    } else if (section == [sectionNamesArray count]-1) {

        int previousSection = section - 1;
        int previousNumRows = [set countForObject:[NSString stringWithFormat:[sectionNamesArray objectAtIndex:previousSection]]];
        NSRange range = NSMakeRange(previousNumRows+initNumRows,numOfRows);
        NSLog(@"previous num rows = %i and current num of rows = %i",previousNumRows,numOfRows);
        NSArray *subArray = [[namesArray subarrayWithRange:range] retain];
        NSArray *subTownArray = [[townArray subarrayWithRange:range]retain];
        cell.primaryLabel.text = [subArray objectAtIndex:indexPath.row];
        cell.secondaryLabel.text = [subTownArray objectAtIndex:indexPath.row];
        NSLog(@"sub array === %@",subArray);


    } else  {

        int previousSection = section - 1;


        int previousNumRows = [set countForObject:[NSString stringWithFormat:[sectionNamesArray objectAtIndex:previousSection]]];
        int location = previousNumRows;
        NSRange range = NSMakeRange(previousNumRows,numOfRows);
        NSLog(@"location = %i",location);
        NSLog(@"previous num rows = %i and current num of rows = %i",previousNumRows,numOfRows);
        NSArray *subArray = [[namesArray subarrayWithRange:range] retain];
        NSArray *subTownArray = [[townArray subarrayWithRange:range]retain];
        cell.primaryLabel.text = [subArray objectAtIndex:indexPath.row];
        cell.secondaryLabel.text = [subTownArray objectAtIndex:indexPath.row];

    }     //NSLog(@"section name = %@ . num of rows = %i",sectionName,numOfRows);





    return cell;

Answer 1

我认为你把事情过于复杂化了。为什么不使用您拥有的数据创建您的部分（仅包含部分标题的字典），然后在 cellForRowAtIndexPath 中执行类似的操作：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSDictionary *selRow = [[self.units valueForKey:[[[self.units allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row];

...
}

这是我用于构建该字典的方法：

-(void)buildSectionKeysWithMutableArray:(NSMutableArray *)mutableArray {
    NSMutableString *prevUnit;
    units = [[NSMutableDictionary alloc] init];

    // Loop through the mutableArray passed in and build our keys
    for (NSDictionary *thisUnit in mutableArray)
    {
        NSString *unitName = [thisUnit objectForKey:@"LOCATION"];
        if (![prevUnit isEqualToString:unitName]) {
            [self.units setValue:[[NSMutableArray alloc] init] forKey:unitName];                
        }
        prevUnit = [NSString stringWithString:unitName];
    }

    // Loop again and add the keys into the units mutableDictionary
    for (NSDictionary *thisUnit in mutableArray)
    {
        [[self.units objectForKey:[thisUnit objectForKey:@"LOCATION"]] addObject:thisUnit];
    }

}

这允许您保留数据的表示形式动态的。