ios - iOS: UITableViewController -- cellForRowAtIndexPath セルの作成

Question

Apple のドキュメントでは、cellForRowAtIndexPath が順番に実行されることを指定していないことを知っています。つまり、最初にセクション 0、インデックス 0 に移動します。次に、セクション 0、インデックス 2。そして、セクション 1、インデックス 0....など。飛び跳ねると思います。

以下を達成するためのより良い方法は何ですか? 現在、エラーが発生し続けています

NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 3 beyond bounds [0 .. 2]'

エラーが表示されます b/c cellForRowAtIndexPath がジャンプしてマークを付けると思う *sectioned = NULLので、条件がスキップされて空の配列になるか、間違った条件に移動してインデックス数を超えます。

コードは次のとおりです。

... declared and synthesized 
NSManaged *object;
@property (strong, nonatomic) NSNumber *sevenDaysSectionFilled;
@property (strong, nonatomic) NSNumber *fourteenDaysSectionFilled;
@property (strong, nonatomic) NSNumber *thirtyDaysSectionFilled;


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    object = NULL;
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    if (indexPath.section == 0)
    {
        if ((SevenDaysArraySectioned == [NSNumber numberWithBool:YES]) && (sevenDaysSectionFilled != [NSNumber numberWithBool:YES]))
        {
            object = [pastSevenDayArray objectAtIndex:indexPath.row];
            sevenDaysSectionFilled = [NSNumber numberWithBool:YES];
        }

        else if ((fourteenDaysArraySectioned == [NSNumber numberWithBool:YES]) && (fourteenDaysSectionFilled != [NSNumber numberWithBool:YES]))
        {
            object = [pastFourteenDaysArray objectAtIndex:indexPath.row];
            fourteenDaysSectionFilled = [NSNumber numberWithBool:YES];
        }

        else if ((thirtyDaysArraySectioned == [NSNumber numberWithBool:YES]) && (thirtyDaysSectionFilled != [NSNumber numberWithBool:YES]))
        {
            object = [pastThirtyDaysArray objectAtIndex:indexPath.row];
            thirtyDaysSectionFilled = [NSNumber numberWithBool:YES];
        }

    else if (indexPath.section == 1)
    {
        if ((fourteenDaysArraySectioned == [NSNumber numberWithBool:YES]) && (fourteenDaysSectionFilled != [NSNumber numberWithBool:YES]))
        {
            object = [pastFourteenDaysArray objectAtIndex:indexPath.row];
            fourteenDaysSectionFilled = [NSNumber numberWithBool:YES];
        }

        else if ((thirtyDaysArraySectioned == [NSNumber numberWithBool:YES]) && (thirtyDaysSectionFilled != [NSNumber numberWithBool:YES]))
        {
            object = [pastThirtyDaysArray objectAtIndex:indexPath.row];
            thirtyDaysSectionFilled = [NSNumber numberWithBool:YES];
        }

    else if (indexPath.section == 2)
    {
        if ((thirtyDaysArraySectioned == [NSNumber numberWithBool:YES]) && (thirtyDaysSectionFilled != [NSNumber numberWithBool:YES]))
        {
             object = [pastThirtyDaysArray objectAtIndex:indexPath.row];
            thirtyDaysSectionFilled = [NSNumber numberWithBool:YES];
        }
     }

NSString *entityName = [[object entity]name];
cell.textLabel.text = [NSString stringWithFormat:@"%@   %i", entityName, [indexPath row]];

  object = NULL;
  return cell;
}

これを達成するためのより良い方法があれば教えてください。ありがとう。

*編集

これは少し複雑ですが、次のとおりです。

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    numberOfSections = 0;

    if ([pastSevenDayArray count] > 0) numberOfSections++;
    if ([pastFourteenDaysArray count] > 0) numberOfSections++;
    if ([pastThirtyDaysArray count] > 0) numberOfSections++;
    if ([pastSixtyDaysArray count] > 0) numberOfSections++;
    if ([pastNinteyDaysArray count] > 0) numberOfSections++;
    if ([pastArray count] > 0) numberOfSections++;

    [self numberOfCells];


    return numberOfSections;
}

セル数

-(void)numberOfCells
{
    for (int section = 0; section<numberOfSections; section ++)
    {
        if (section == 0)
        {
            if ([pastSevenDayArray count] > 0)
            {
                SevenDaysArraySectioned = [NSNumber numberWithBool:YES];
                sectionZeroCellCount = [pastSevenDayArray count];
                sectionZeroHeader = sevenDaysSectionLabel;
            }
            else if ([pastFourteenDaysArray count] > 0)
            {
                fourteenDaysArraySectioned = [NSNumber numberWithBool:YES];
                sectionZeroCellCount = [pastFourteenDaysArray count];
                sectionZeroHeader = fourteenDaysSectionLabel;
            }
            else if ([pastThirtyDaysArray count] > 0)
            {
                thirtyDaysArraySectioned = [NSNumber numberWithBool:YES];
                sectionZeroCellCount = [pastThirtyDaysArray count];
                sectionZeroHeader = thirtyDaysSectionLabel;
            }
            else if ([pastSixtyDaysArray count] > 0)
            {
                sixtyDaysArraySectioned = [NSNumber numberWithBool:YES];
                sectionZeroCellCount = [pastSixtyDaysArray count];
                sectionZeroHeader = sixtyDaysSectionLabel;

            }
            else if ([pastNinteyDaysArray count] > 0)
            {
                ninetyDaysArraySectioned = [NSNumber numberWithBool:YES];
                sectionZeroCellCount = [pastNinteyDaysArray count];
                sectionZeroHeader = ninetyDaysSectionLabel;
            }
            else if ([pastArray count] > 0)
            {
                pastArraySectioned = [NSNumber numberWithBool:YES];
                sectionZeroCellCount = [pastArray count];
                sectionZeroHeader = pastSectionLabel;
            }
        }

        else if (section == 1)
        {    
            if (([pastFourteenDaysArray count] > 0) && (fourteenDaysArraySectioned != [NSNumber numberWithBool:YES]))

            {
                fourteenDaysArraySectioned = [NSNumber numberWithBool:YES];
                sectionOneCellCount = [pastFourteenDaysArray count];
                sectionOneHeader = fourteenDaysSectionLabel;
            }
            else if (([pastThirtyDaysArray count] > 0) && (thirtyDaysArraySectioned != [NSNumber numberWithBool:YES]))

            {
                thirtyDaysArraySectioned = [NSNumber numberWithBool:YES];
                sectionOneCellCount = [pastThirtyDaysArray count];
                sectionOneHeader = thirtyDaysSectionLabel;
            }
            else if (([pastSixtyDaysArray count] > 0) && (sixtyDaysArraySectioned != [NSNumber numberWithBool:YES]))
            {
                sixtyDaysArraySectioned = [NSNumber numberWithBool:YES];
                sectionOneCellCount = [pastSixtyDaysArray count];
                sectionOneHeader = sixtyDaysSectionLabel;
            }
            else if (([pastNinteyDaysArray count] > 0) && (ninetyDaysArraySectioned != [NSNumber numberWithBool:YES]))

            {
                ninetyDaysArraySectioned = [NSNumber numberWithBool:YES];
                sectionOneCellCount = [pastNinteyDaysArray count];
                sectionOneHeader = ninetyDaysSectionLabel;
            }
            else if (([pastArray count] > 0) && (pastArraySectioned != [NSNumber numberWithBool:YES]))
            {
                pastArraySectioned = [NSNumber numberWithBool:YES];
                sectionOneCellCount = [pastArray count];
                sectionOneHeader = pastSectionLabel;
            }
        }
        else if (section ==2)
        {
            if (([pastThirtyDaysArray count] > 0) && (thirtyDaysArraySectioned != [NSNumber numberWithBool:YES]))

            {
                thirtyDaysArraySectioned = [NSNumber numberWithBool:YES];
                sectionTwoCellCount = [pastThirtyDaysArray count];
                sectionTwoHeader = thirtyDaysSectionLabel;
            }
            else if (([pastSixtyDaysArray count] > 0) && (sixtyDaysArraySectioned != [NSNumber numberWithBool:YES]))
            {
                sixtyDaysArraySectioned = [NSNumber numberWithBool:YES];
                sectionTwoCellCount = [pastSixtyDaysArray count];
                sectionTwoHeader = sixtyDaysSectionLabel;
            }
            else if (([pastNinteyDaysArray count] > 0) && (ninetyDaysArraySectioned != [NSNumber numberWithBool:YES]))

            {
                ninetyDaysArraySectioned = [NSNumber numberWithBool:YES];
                sectionTwoCellCount = [pastNinteyDaysArray count];
                sectionTwoHeader = ninetyDaysSectionLabel;
            }
            else if (([pastArray count] > 0) && (pastArraySectioned != [NSNumber numberWithBool:YES]))
            {
                pastArraySectioned = [NSNumber numberWithBool:YES];
                sectionTwoCellCount = [pastArray count];
                sectionTwoHeader = pastSectionLabel;
            }
        }
        else if (section ==3)

        {
            NSLog(@"Entered Section %i", section);

            if (([pastSixtyDaysArray count] > 0) && (sixtyDaysArraySectioned != [NSNumber numberWithBool:YES]))            {
                sixtyDaysArraySectioned = [NSNumber numberWithBool:YES];
                sectionThreeCellCount = [pastSixtyDaysArray count];
                sectionThreeHeader = sixtyDaysSectionLabel;
            }
            else if (([pastNinteyDaysArray count] > 0) && (ninetyDaysArraySectioned != [NSNumber numberWithBool:YES]))
            {
                ninetyDaysArraySectioned = [NSNumber numberWithBool:YES];
                sectionThreeCellCount = [pastNinteyDaysArray count];
                sectionThreeHeader = ninetyDaysSectionLabel;          
            }
            else if (([pastArray count] > 0) && (pastArraySectioned != [NSNumber numberWithBool:YES]))
            {
                pastArraySectioned = [NSNumber numberWithBool:YES];
                sectionThreeCellCount = [pastArray count];
                sectionThreeHeader = pastSectionLabel;
            }
        }
        else if (section ==4)
        {
            NSLog(@"Entered Section %i", section);

            if (([pastNinteyDaysArray count] > 0) && (ninetyDaysArraySectioned != [NSNumber numberWithBool:YES]))
            {
                ninetyDaysArraySectioned = [NSNumber numberWithBool:YES];
                sectionFourCellCount = [pastNinteyDaysArray count];
                sectionFourHeader = ninetyDaysSectionLabel;
            }
            else if (([pastArray count] > 0) && (pastArraySectioned != [NSNumber numberWithBool:YES]))
            {
                pastArraySectioned = [NSNumber numberWithBool:YES];
                sectionFourCellCount = [pastArray count];
                sectionFourHeader = pastSectionLabel;
            }
        }

        else if (section ==5)
        {
            NSLog(@"Entered Section %i", section);

            if (([pastArray count] > 0) && (pastArraySectioned != [NSNumber numberWithBool:YES]))
            {
                pastArraySectioned = [NSNumber numberWithBool:YES];
                sectionFiveCellCount = [pastArray count];
                sectionFiveHeader = pastSectionLabel;
            }
        }

    }

}

numberOfRowsInSection

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{

    if (section == 0)
    {
        return sectionZeroCellCount;
    }

    else if (section == 1)
    {
        return sectionOneCellCount;
    }
    else if (section == 2)
    {
        return sectionTwoCellCount;
    }
    else if (section == 3)
    {
        return sectionThreeCellCount;
    }
    else if (section == 4)
    {
        return sectionFourCellCount;
    }
    if (section == 5)
    {
        return sectionFiveCellCount;
    }
}

編集2

ヘッダ：

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    return 30.0;
}

- (UIView *) tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    UIView *headerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, tableView.bounds.size.width, 150)];
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 3, tableView.bounds.size.width - 10, 25)];
    label.backgroundColor = [UIColor clearColor];
    [label setFont:[UIFont boldSystemFontOfSize:16]];
    label.textColor = [UIColor whiteColor];

    if (section == 0)
    {
        label.text = sectionZeroHeader;
    }
    else if (section == 1)
    {
        label.text = sectionOneHeader;
    }

    else if (section == 2)
    {
        label.text = sectionTwoHeader;
    }
    else if (section == 3)
    {
        label.text = sectionThreeHeader;
    }
    else if (section == 4)
    {
        label.text = sectionFourHeader;
    }
    else if (section == 5)
    {
        label.text = sectionFiveHeader;
    }    

    [headerView addSubview:label];
    return headerView;
}

score 1 · Accepted Answer

適切に設定していることを確認する必要があると思います

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;

と

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView;

複数のセクションがあり、各セクションに多くの行が必要な場合は、NSDictionary を使用してキーを設定してください --> 配列値、

NSDictionary *dict = @{@"section1": @[@"obj1", @"obj2"],@"section2": @[@"obj3", @"obj4"]};
NSInteger numberOfSections = [[dict allKeys] count];// return in numberOfSections
NSArray *values = [dict valueForKey:@"obj1"];// get appropriate array

ios - iOS: UITableViewController -- cellForRowAtIndexPath セルの作成

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