可变数组添加的对象数量不正确

Question

我有一个包含8个单元格（section）的表视图的视图控制器。我创建了一个文本框，并将该文本框作为子视图添加到6个单元格中，剩下的2个单元格分别包含一个文本视图和一个按钮。由于我正在使用相同的文本框，我已经分配了标记值，然后创建了一个可变数组，并将文本框添加到该数组中。以下是实现代码：

考虑到Lanc先生给出的建议，我已更改了实现代码。

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，从上面的输出结果中可以观察到打印出来的字段数量是5，即4个文本字段和一个带按钮的单元格。但是根据我们在-CellForRowAtIndexPath中的编码，应该有6个单元格包含文本字段，因此字段的数量必须为6，但我们得到了错误的结果，即5（4个文本字段+按钮），这是一个严重错误。

这也导致了我在表视图中保存数据的问题。对于右侧导航栏按钮项目“保存”（在我的情况下），我已经实现了：

-(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];
 }
}

现在的问题出在索引位置数值上，因为"fields"数组所持有的值（字段）数量是5，索引值应该是0-4。但如果我按照这样的值来保存，插入SQLite数据库时会少一个字段。同时，在控制台打印时，表格视图中第5个和第7个位置的值为空。在上述实现片段中，我们可以观察到我使用了表格视图部分值（索引）的索引位置进行插入。

当我按照表格视图的部分索引值进行保存时，值会被正确打印。但是，当我不触摸表格视图的第5个和第7个位置时，会出现崩溃问题，即“***-[NSMutableArray objectAtIndex:]: index 5 beyond bounds [0 .. 4]”。

我不明白为什么只有5个字段值被插入到数组中而不是6个。请问有人能指导我正确的方向吗？

对于这篇文章过长，我表示抱歉，但我想详细说明问题，以便更容易回答问题。

编辑：

表格视图中的节和行数的代码如下：

#pragma mark -
#pragma mark TableView Datasource

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

    return 8;

}

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

    int arr = 1;

    return arr;
}

实现索引路径处行的高度：

- (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;
    }
}

在滚动之前，所有的表视图单元格都没有加载。但是当我滚动时，控制器会到达第5、6和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未被添加到“fields”数组的原因。

我搜索了解决方案，大多数帖子都是像this这样的类型。

提前感谢大家 :)

- Eshwar Chaitanya

---

@Sarah 当我进入视图时，我遇到了崩溃的问题。 - Eshwar Chaitanya

@Sarah，实际上他正在将UITextField添加到self.fields中。因为即使在“save”方法中，他也将其作为UITextField检索 - Ilanchezhian

是啊...这个字段的数据类型是什么？ - Yama

尝试自己做，只有这样你才能学会..!! - Yama

@Sarah k，我会尽力而为，谢谢关心 :) - Eshwar Chaitanya

Answer 1

你尝试过滚动tableview吗？

如果你把这段代码放在if(cell == nil)里面，那么它可能不会创建所有的文本字段，因为表格单元格是可重用的。最好为所有8个单元格设置不同的单元格标识符。这将解决你的问题。

- Ilanchezhian

---

嗨，Lanc先生，我已经按照您建议的实现了每个单元格的单独单元格标识符，但是控件仍然无法到达第5、6和7个单元格，直到我滚动视图...请再次查看我的帖子，在此提前感谢您 :) - Eshwar Chaitanya

实际上，我已经尝试了您的代码。一开始，所有8个单元格都被加载了。我的表视图高度为416。所有8个文本字段都被打印出来了。（逐步进行，先是1，然后是2，然后是3...） - Ilanchezhian

你有没有重新看过我的帖子？ - Eshwar Chaitanya

所以，如果您的表视图高度较小，并且仅加载了4或5个单元格，则“fields”将只有那么多文本字段。如果您尝试访问数组中的第6个元素，则会崩溃。 - Ilanchezhian

我没有在xib中或通过编码更改表视图高度，高度为460，但我们不能一开始就完全查看整个表视图，需要滚动，当节/行的数量超过时，出了什么问题，你能指导我吗？ :) - Eshwar Chaitanya

Answer 2

我找到了这个问题的解决方案 在这里

感谢所有查看该问题的人。

- Eshwar Chaitanya