添加到可变数组的对象数量不正确
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【中文标题】添加到可变数组的对象数量不正确【英文标题】：Incorrect number of objects getting added to mutable array 【发布时间】：2012-02-01 06:17:29 【问题描述】：我有一个带有表格视图的视图控制器，其中包含 8 个单元格（部分）。我创建了一个 textField 并将该文本字段作为子视图添加到 6 个单元格，其余 2 个单元格，其中一个单元格包含文本视图，另一个包含文本视图带有一个按钮。因为我使用的是相同的文本字段，所以我已经分配了标签值，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Lanc先生的建议，我已经修改了实现代码
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>>"
)
现在我们可以从上面的 o/p 观察到要打印的字段数是 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 中的编码，6 个单元格包含文本字段，因此字段数必须为 6，但我们得到了错误的结果，即 5（4 个文本字段+按钮），这是一个错误。
这也导致我将数据保存在表格视图问题中，即在我的情况下，对于标题为“保存”的右侧导航栏按钮项，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];
现在问题出在索引位置值上，因为 "fields" 数组保存的值（字段）的数量是 5，索引值将是 0-4，但是如果我相应地给出值，即在保存时，在将数据插入到 sqlite 数据库时，我会少一个字段，而且在控制台中打印时，我在表视图的第 5 和第 7 个位置得到空值。在上面的实现 sn-p 中，我们可以观察到我有使用索引位置插入到表视图部分值（索引）的位置。
当我根据表格视图的部分索引值保存时，这些值可以正确打印。但是当我不触摸表格视图的第 5 和第 7 个位置时，我遇到了崩溃问题。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 个被插入到数组中。任何人都可以指导我正确的方向
很抱歉这篇庞大的帖子，我想提供信息，因此我把它看起来很详细，以便可以轻松回答问题。
编辑
表格视图的节数和行数代码：
#pragma mark -
#pragma mark TableView Datasource
- (NSInteger)numberOfSectionsInTableView:(UITableView *)atableView
return 8;
- (NSInteger)tableView:(UITableView *)atableView numberOfRowsInSection:(NSInteger)section
int arr = 1;
return arr;
在索引路径的行高度实现：
- (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;
所有表格视图单元格在滚动之前都没有加载。但是当我滚动时，控件到达第 5、第 6 和第 7 个单元格。我发现这就是第 5 和第 7 个单元格中的文本字段没有被添加到“字段”数组。
我搜索的解决方法主要是this类型的帖子
提前谢谢大家:)
【问题讨论】：
应该是[self.fields addObject:textField.text]; @Sarah 谢谢sarah，将实施并回复您 @Sarah 现在我进入视图时遇到崩溃问题： 原因：'*** -[NSMutableArray insertObject:atIndex:]：尝试在 0 处插入 nil 对象' @Sarah，实际上他正在将 UITextField 添加到self.fields。因为，即使在save 方法中，他也将其检索为 UITextField
【参考方案1】：
您是否尝试滚动表格视图？我
如果您在if( cell == nil ) 中添加了此代码，则它可能不会创建所有文本字段，因为表格单元格被重复使用。更好的是，所有 8 个单元格都有不同的单元格标识符。那会解决你的问题。
【讨论】：
是的，在更新值时，我滚动了表格视图，发现按钮逻辑不起作用。但是我在添加 if(cell == nil) 之前添加了这些行 NSString *CellIdentifier = [NSString stringWithFormat:@"S%1dR%1d",indexPath.section,indexPath.row]; UITableViewCell *cell = (UITableViewCell *)[atableView dequeueReusableCellWithIdentifier:CellIdentifier]; 但是我有一个问题要问你，剩余的文本字段是如何添加的，我的意思是剩余的 5 个，提前谢谢 :) 您在numberOfSectionsInTableView、numberOfRowsInSection 和heightForRowAtIndexPath 中返回什么值？
我通过放置断点发现 case 5,6,7 即滚动前表格视图的底部单元格没有运行，我的意思是根本没有达到控制【参考方案2】：
我找到了问题here的解决方案
感谢每一位查看问题的人。
【讨论】：
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