从单元格的textField返回空值

Question

我用textField创建了一个自定义单元格，但是我无法检索它的值。
在我的tableView中，有3个这些自定义单元格，以及其他默认单元格。
当我试试这个：

NSString *string = customCell.textField.text; 

我总是得到一个空值...
这是我的代码：

TextFieldCell.m

#import "TextFieldCell.h" 

@implementation TextFieldCell 

@synthesize label; 
@synthesize textField; 

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier 
{ 
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]; 
    if (self) 
    { 
     label = [[UILabel alloc] initWithFrame:CGRectZero]; 
     label.backgroundColor = [UIColor clearColor]; 
     label.textAlignment = UITextAlignmentRight; 
     label.textColor = [UIColor blackColor]; 
     label.font = [UIFont boldSystemFontOfSize:16.0]; 
     label.adjustsFontSizeToFitWidth = YES; 
     label.baselineAdjustment = UIBaselineAdjustmentNone; 
     label.numberOfLines = 20; 
     [self.contentView addSubview:label]; 

     textField = [[UITextField alloc] initWithFrame:CGRectZero]; 
     textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter; 
     textField.backgroundColor = [UIColor clearColor]; 
     textField.font = [UIFont boldSystemFontOfSize:16.0]; 
     textField.delegate = self; 
     textField.returnKeyType = UIReturnKeyDone; 
     [self.contentView addSubview:textField]; 
    } 

    return self; 
} 

-(void)layoutSubviews 
{ 
    [super layoutSubviews]; 

    CGRect r = CGRectInset(self.contentView.bounds, 8, 8); 
    CGRect r1 = CGRectInset(self.contentView.bounds, 8, 8); 

    if (label.text != nil) 
    { 
     r.size = CGSizeMake(12, 27); 
     label.frame = r; 

     r1.origin.x += self.label.frame.size.width + 6; 
     r1.size.width -= self.label.frame.size.width + 6; 
     textField.frame = r1; 
    } 
    else 
    { 
     textField.frame = r; 
    } 
} 

-(BOOL)textFieldShouldReturn:(UITextField *)aTextField 
{ 
    [textField resignFirstResponder]; 
    return NO; 
} 

- (void)setSelected:(BOOL)selected animated:(BOOL)animated 
{ 
    [super setSelected:selected animated:animated]; 
} 

@end 

表视图数据源

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    if (indexPath.section == 0) 
    { 
     if (indexPath.row == 0) 
     { 
      return [self textFieldCellForTableView:tableView atIndexPath:indexPath]; 
     } 
     else if (indexPath.row == 1) 
     { 
      return [self textFieldCellForTableView:tableView atIndexPath:indexPath]; 
     } 
     else 
     { 
      return [self defaultCellForTableView:tableView atIndexPath:indexPath]; 
     } 
    } 
    else if (indexPath.section == 1) 
    { 
     if (indexPath.row == 0) 
     { 
      return [self textFieldCellForTableView:tableView atIndexPath:indexPath]; 
     } 
     else 
     { 
      return [self defaultCellForTableView:tableView atIndexPath:indexPath]; 
     } 
    } 
    else if (indexPath.section == 2) 
    { 
     return [self defaultCellForTableView:tableView atIndexPath:indexPath]; 
    } 
    else 
    { 
     return [self chooseFotoCellForTableView:tableView atIndexPath:indexPath]; 
    } 
} 

-(TextFieldCell *)textFieldCellForTableView:(UITableView *)tableView atIndexPath:(NSIndexPath *)indexPath 
{ 
    static NSString *TextFieldCellIdentifier = @"TextFieldCellIdentifier"; 

    TextFieldCell *cell = [tableView dequeueReusableCellWithIdentifier:TextFieldCellIdentifier]; 
    if (cell == nil) 
    { 
     cell = [[[TextFieldCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:TextFieldCellIdentifier] autorelease]; 
     cell.selectionStyle = UITableViewCellSelectionStyleNone; 
    } 

    if (indexPath.section == 0) 
    { 
     if (indexPath.row == 0) 
     { 
      cell.label.text = nil; 
      cell.textField.placeholder = NSLocalizedString(@"Nome", @""); 
     } 
     else 
     { 
      cell.label.text = [[NSLocale currentLocale] objectForKey:NSLocaleCurrencySymbol]; 
      cell.textField.placeholder = NSLocalizedString(@"Costo", @""); 
     } 
    } 
    else 
    { 
     cell.label.text = nil; 
     cell.textField.placeholder = NSLocalizedString(@"URL", @""); 
    } 

    return cell; 
} 

Code To Ret rieve文本字段值

TextFieldCell *nomeCell = (TextFieldCell *)[self tableView:self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]]; 
TextFieldCell *costoCell = (TextFieldCell *)[self tableView:self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:1 inSection:0]]; 
TextFieldCell *linkCell = (TextFieldCell *)[self tableView:self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:1]]; 

NSLog(@"nomeCell textField = %@", nomeCell.textField.text); 
NSLog(@"costoCell textField = %@", costoCell.textField.text); 
NSLog(@"linkCell textField = %@", linkCell.textField.text); 

我试图登录nomeCell，costoCell和linkCell，他们都正确分配和初始化，我没有使用ARC这里...
谁能帮助我？
非常感谢！

Answer 1

我假设你已经真正进入了您要检索值的时间在文本字段中一些文本，您检索值更新你的数据模型，而不是依靠表格视图/单元格来存储你的数据？

不要通过调用您的表视图控制器的tableView:cellForRowAtIndexPath:来获取当前单元格。这只能在需要新单元时由表视图调用。

直接调用表视图上的cellForRowAtIndexPath:方法。取而代之的是：

TextFieldCell *nomeCell = (TextFieldCell *)[self tableView:self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]]; 

这样做：

TextFieldCell *nomeCell = (TextFieldCell *)[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]]; 

Answer 2

您正在将文本指定给placeholder属性，并且您正在记录textField.text。

Answer 3

textField = [[UITextField alloc] initWithFrame:CGRectZero]; 
     textField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter; 
     textField.backgroundColor = [UIColor clearColor]; 
     textField.font = [UIFont boldSystemFontOfSize:16.0]; 
     textField.delegate = self; 

     //added 
     textField.tag = 101; 

     textField.returnKeyType = UIReturnKeyDone; 
     [self.contentView addSubview:textField]; 

代码来检索文本字段值：

//fetch cell for which you want to get textfield then, 
TextFieldCell *nomeCell = (TextFieldCell *)[cell.contentView viewWithTag:101];