添加到可变数组的对象数量不正确

Question

我有一个带有表视图的视图控制器，其中包含 8 个单元格（部分）。我创建了一个文本字段，并将该文本字段作为子视图添加到 6 个单元格中，其余 2 个单元格，其中一个单元格包含文本视图，另一个单元格包含按钮因为我使用相同的文本字段，所以我分配了标签值，然后创建了一个可变数组，将文本字段添加到该数组中。这是实现代码：

考虑到 Mr.Lanc 给出的建议，我已经改变了实现代码

编辑

- (UITableViewCell *)tableView:(UITableView *)atableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

 NSString *identifier = @"UITableViewCell";

UITableViewCell *cell = (UITableViewCell *)[atableView dequeueReusableCellWithIdentifier:identifier];

    atableView.backgroundColor = [UIColor clearColor];

    textField = [[[UITextField alloc]initWithFrame:CGRectMake(15, 12, 300, 24)]autorelease];
    textField.textColor = [UIColor whiteColor];
    textField.delegate = self;
    tagValues = textField.tag;


switch (indexPath.section) 
{
    case 0:
    {
        NSString *cellIdentifierA = [NSString stringWithFormat:@"S%1dR%1d",indexPath.section,indexPath.row];
        if (cell == nil) 
        {
            cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifierA];
            cell.backgroundColor = [[UIColor alloc]initWithPatternImage:[UIImage imageNamed:@"reminderbutton.png"]];
        }
        textField.placeholder = @"Enter name";
        textField.tag = 101;
        textField.text = reminderInstance.Name;
        textField.autocorrectionType = UITextAutocorrectionTypeNo;
        [cell.contentView addSubview:textField];
    }
        break;

    case 1:
    {
        NSString *cellIdentifierB = [NSString stringWithFormat:@"S%1dR%1d",indexPath.section,indexPath.row];
        if (cell == nil) 
        {
            cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifierB];
            cell.backgroundColor = [[UIColor alloc]initWithPatternImage:[UIImage imageNamed:@"reminderbutton.png"]];
        }
        textField.tag = 102;
        textField.text = reminderInstance.Event;
        [cell.contentView addSubview:textField];
    }
        break;

    case 2:
    {
        NSString *cellIdentifierC = [NSString stringWithFormat:@"S%1dR%1d",indexPath.section,indexPath.row];
        if (cell == nil) 
        {
            cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifierC];
            cell.backgroundColor = [[UIColor alloc]initWithPatternImage:[UIImage imageNamed:@"reminderbutton.png"]];
        }
        textField.placeholder = @"Click here to set date and time";
        textField.inputView = self.datePicker;
        textField.text = reminderInstance.Date;
        textField.tag = 103;
        [cell.contentView addSubview:textField];
    }   
        break;

    case 3:
    {
        NSString *cellIdentifierD = [NSString stringWithFormat:@"S%1dR%1d",indexPath.section,indexPath.row];
        if (cell == nil) 
        {
            cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifierD];
            cell.backgroundColor = [[UIColor alloc]initWithPatternImage:[UIImage imageNamed:@"reminderbutton.png"]];
        }
        textField.tag = 105;
        textField.text = reminderInstance.numDays;
        textField.inputView = self.reminderPicker;
        [cell.contentView addSubview:textField];
    }
        break;

    case 4:
    {   
        NSString *cellIdentifierE = [NSString stringWithFormat:@"S%1dR%1d",indexPath.section,indexPath.row];
        if (cell == nil) 
        {
            cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifierE];
            cell.backgroundColor = [[UIColor alloc]initWithPatternImage:[UIImage imageNamed:@"reminderbutton.png"]];
        }
        checkboxButton = [[[UIButton alloc] initWithFrame:CGRectMake(16,1,120, 44)]autorelease];
        [checkboxButton setImage:[UIImage imageNamed:@"ewee.png"] forState:UIControlStateNormal];
        [checkboxButton addTarget:self action:@selector(toggleButton:) forControlEvents:UIControlEventTouchUpInside];

        NSString *one = reminderInstance.selString;
        NSNumber* i = [NSNumber numberWithInt:[one intValue]];
        BOOL isOn = [i boolValue];

        if(isOn)
        {
            [checkboxButton setImage:[UIImage imageNamed:@"checkarrow.png"] forState:UIControlStateNormal];
        }
        else
        {
            [checkboxButton setImage:[UIImage imageNamed:@"ewee.png"] forState:UIControlStateNormal];
        }            

        [checkboxButton setContentHorizontalAlignment:UIControlContentHorizontalAlignmentLeft];
        [checkboxButton setImageEdgeInsets:UIEdgeInsetsMake(0.0, 0.0, 0.0, 0.0)];
        [cell addSubview:checkboxButton];
        UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(55, 10, 225, 24)];
        label.text = @"Every Year";
        label.textColor = [UIColor whiteColor];
        label.backgroundColor = [UIColor clearColor];
        [cell addSubview:label];
        cell.textLabel.textColor = [UIColor whiteColor];
        [label release];
    }
        break;

    case 5:
    {
        NSString *cellIdentifierF = [NSString stringWithFormat:@"S%1dR%1d",indexPath.section,indexPath.row];
        if (cell == nil) 
        {
            cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifierF];
            cell.backgroundColor = [[UIColor alloc]initWithPatternImage:[UIImage imageNamed:@"reminderbutton.png"]];
        }
        textField.placeholder = @"Enter the number here";
        textField.text = num;
        textField.text = reminderInstance.number;
        textField.tag = 106; 
        textField.userInteractionEnabled = YES;
        textField.keyboardType = UIKeyboardTypeNumberPad;
        [cell.contentView addSubview:textField];
    }
        break;

    case 6:
    {
        NSString *cellIdentifierG = [NSString stringWithFormat:@"S%1dR%1d",indexPath.section,indexPath.row];
        if (cell == nil) 
        {
            cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifierG];
            cell.backgroundColor = [[UIColor alloc]initWithPatternImage:[UIImage imageNamed:@"reminderbutton.png"]];
        }
        cell.backgroundColor = [UIColor clearColor];
        textView.clipsToBounds = YES;
        textView = [[UITextView alloc]initWithFrame: CGRectMake(-2, -3, 307, 154)];
        UIImageView *imgView = [[[UIImageView alloc]initWithFrame: textView.frame]autorelease];
        imgView.image = [UIImage imageNamed: @"reminderbuttonxl.png"];
        [textView addSubview: imgView];
        [textView sendSubviewToBack: imgView];
        textView.backgroundColor = [UIColor clearColor];
        textView.delegate = self;
        textView.tag = 11;
        textView.text = reminderInstance.msgBody;
        tagValues = textView.tag;
        textView.textColor = [UIColor whiteColor];
        [cell.contentView addSubview:textView];
        [textView release];
    }
        break;

    case 7:
    {
        NSString *cellIdentifierH = [NSString stringWithFormat:@"S%1dR%1d",indexPath.section,indexPath.row];
        if (cell == nil) 
        {
            cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifierH];
            cell.backgroundColor = [[UIColor alloc]initWithPatternImage:[UIImage imageNamed:@"reminderbutton.png"]];
        }
        textField.tag = 107;
        textField.inputView = self.groupPicker;
        tagValues = textField.tag;
        textField.text = reminderInstance.remGroup;
        [cell.contentView addSubview:textField];
    }
        break;

    default:
        break;
}

    [self.fields addObject:textField];

NSLog(@"Fields = %@",fields);

return cell;

}

现在，当我尝试使用以下语句打印数组时：

NSLog(@"Fields = %@",fields);我可以在控制台窗口中观察到以下内容：

Fields = (
    "<UITextField: 0x9d043a0; frame = (15 12; 300 24); clipsToBounds = YES; opaque = NO; tag = 101; layer = <CALayer: 0x9d044e0>>"
)
Fields = (
    "<UITextField: 0x9d043a0; frame = (15 12; 300 24); clipsToBounds = YES; opaque = NO; tag = 101; layer = <CALayer: 0x9d044e0>>",
    "<UITextField: 0x9d07d50; frame = (15 12; 300 24); clipsToBounds = YES; opaque = NO; tag = 102; layer = <CALayer: 0x9d07ca0>>"
)
Fields = (
    "<UITextField: 0x9d043a0; frame = (15 12; 300 24); clipsToBounds = YES; opaque = NO; tag = 101; layer = <CALayer: 0x9d044e0>>",
    "<UITextField: 0x9d07d50; frame = (15 12; 300 24); clipsToBounds = YES; opaque = NO; tag = 102; layer = <CALayer: 0x9d07ca0>>",
    "<UITextField: 0x7108650; frame = (15 12; 300 24); clipsToBounds = YES; opaque = NO; tag = 103; layer = <CALayer: 0x7108620>>"
)
Fields = (
    "<UITextField: 0x9d043a0; frame = (15 12; 300 24); clipsToBounds = YES; opaque = NO; tag = 101; layer = <CALayer: 0x9d044e0>>",
    "<UITextField: 0x9d07d50; frame = (15 12; 300 24); clipsToBounds = YES; opaque = NO; tag = 102; layer = <CALayer: 0x9d07ca0>>",
    "<UITextField: 0x7108650; frame = (15 12; 300 24); clipsToBounds = YES; opaque = NO; tag = 103; layer = <CALayer: 0x7108620>>",
    "<UITextField: 0x5c7bf90; frame = (15 12; 300 24); clipsToBounds = YES; opaque = NO; tag = 105; layer = <CALayer: 0x5c7c920>>"
)
Fields = (
    "<UITextField: 0x9d043a0; frame = (15 12; 300 24); clipsToBounds = YES; opaque = NO; tag = 101; layer = <CALayer: 0x9d044e0>>",
    "<UITextField: 0x9d07d50; frame = (15 12; 300 24); clipsToBounds = YES; opaque = NO; tag = 102; layer = <CALayer: 0x9d07ca0>>",
    "<UITextField: 0x7108650; frame = (15 12; 300 24); clipsToBounds = YES; opaque = NO; tag = 103; layer = <CALayer: 0x7108620>>",
    "<UITextField: 0x5c7bf90; frame = (15 12; 300 24); clipsToBounds = YES; opaque = NO; tag = 105; layer = <CALayer: 0x5c7c920>>",
    "<UITextField: 0x9d08b20; frame = (15 12; 300 24); clipsToBounds = YES; opaque = NO; layer = <CALayer: 0x9d08af0>>"
)

现在，我们可以从上面的 o/p 中观察到，要打印的字段数量为 5，即 4 个文本字段和带有按钮的单元格，但是根据我们在 -CellForRowAtIndexPath,6 中的编码单元格包含文本字段，因此字段数必须为 6，但我们得到错误的结果，即 5（4 个文本字段+按钮），这是一个错误。

这也导致我在表视图问题中保存数据，即在我的例子中，对于标题为“保存”的右侧导航栏按钮项目，我已经实现：

-(IBAction)save:(id)sender
{
//Code for saving entered data using sqlite

    UITextField *fieldOne = [self.fields objectAtIndex:0];
    UITextField *fieldTwo = [self.fields objectAtIndex:1];
    UITextField *fieldThree = [self.fields objectAtIndex:2]; 
    UITextField *fieldFour = [self.fields objectAtIndex:3];
    UITextField *fieldFive = [self.fields objectAtIndex:5];
    UITextField *fieldSix = [self.fields objectAtIndex:7];
sqlite3_stmt *statement = nil;
    const char *dbpath = [databasePath UTF8String];

    if (sqlite3_open(dbpath, &remindersDB) == SQLITE_OK && textField.text != nil)
    {
if (self.navigationItem.rightBarButtonItem.title == @"Save")
        {
            NSLog(@"am in the save loop");
            NSString *insertSQL = [NSString stringWithFormat:@"INSERT INTO reminders(name,event,date,bfr,val,num,bod,grp) VALUES (\"%@\", \"%@\", \"%@\", \"%@\", \"%@\", \"%@\", \"%@\", \"%@\")", fieldOne.text, fieldTwo.text,fieldThree.text,fieldFour.text,isSelected,fieldFive.text,textView.text,fieldSix.text]; 
            const char *insert_stmt = [insertSQL UTF8String];
            sqlite3_prepare_v2(remindersDB, insert_stmt, -1, &statement, NULL);

            if (sqlite3_step(statement) == SQLITE_DONE)
            {
                UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"\nReminder Saved" message:nil delegate:nil cancelButtonTitle:nil otherButtonTitles:nil,nil];
                [alert show];
                [alert dismissWithClickedButtonIndex:0 animated:YES];
                [alert release];
            }

            else 
            {
                UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Alert" message:@"Reminder not saved" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil];
                [alert show];
                [alert release];
            }
        }
//Check the last inserted row id
        rowID =  sqlite3_last_insert_rowid(remindersDB);
        NSLog(@"last inserted rowId = %d",rowID);

        sqlite3_finalize(statement);
        sqlite3_close(remindersDB);

        [self.tableView reloadData];
 }
}

现在问题在于索引位置值，因为值（字段）的数量）“fields”数组保存的是5，索引值将为0-4，但是如果我相应地给出值，即在保存时，我会在插入数据时得到一个更少的字段sqlite 数据库，我也得到空值在控制台中打印时，在表视图的第 5 个和第 7 个位置中。在上面的实现片段中，我们可以观察到我已使用索引位置插入到表视图部分值（索引）的位置。

当我根据表视图的部分索引值保存时，这些值会正确打印。但是当我不触摸表视图的第 5 个和第 7 个位置时，我会遇到崩溃问题。即 '*** -[NSMutableArray objectAtIndex: ]: 索引 5 超出范围 [0 .. 4]'

我不明白为什么只有 5 个字段值而不是 6 个字段值被插入到数组中。任何人都可以指导我正确的方向吗？

对这篇巨大的帖子感到抱歉,我想要为了提供信息，因此我将其看起来很详细，以便可以轻松回答该问题。

编辑

表视图的部分和行数的代码：

#pragma mark -
#pragma mark TableView Datasource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)atableView
{

    return 8;

}

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

    int arr = 1;

    return arr;
}

索引路径行高度的实现：

- (CGFloat)tableView:(UITableView *)atableView heightForRowAtIndexPath:(NSIndexPath *)indexPath 
{
    float f;
    if (indexPath.section==6&&indexPath.row==0) 
    {
        f=140.0f;
        return f;
    }
    else
    {
        f = 44.0f;
    return f;
    }
}

所有表视图单元格在滚动之前都不会加载。但是当我滚动时，控件将达到第5个，第 6 和第 7 个单元格。我发现这就是第 5 个和第 7 个单元格中的文本字段没有添加到“字段”数组中的原因。

我搜索的解决方案主要是 这种类型的帖子

预先感谢大家:)

Answer 1

您尝试过滚动桌面视图吗？ I

如果您已在 if( cell == nil ) 中添加此代码，则它可能不会创建所有文本字段，因为表格单元格被重用。最好为所有 8 个单元使用不同的单元标识符。那可以解决你的问题。

Answer 2

我在此处找到了问题的解决方案

感谢每一位查看过的人的问题。