ios - 以编程方式将文本字段添加到 uitableviewcell 不起作用

Question

菜鸟ios问题。我正在尝试使用表格视图控制器创建一个注册表单。我正在尝试在 cellForRowAtIndexPath 方法中以编程方式向每个单元格添加文本字段，但我的所有文本字段似乎都是在第一个单元格上创建的——一个与另一个重叠。这是我的代码。

这是我的单元格的渲染方式。我想我在重复使用细胞的部分做了一些愚蠢的事情。我确实在stackoverflow上检查了一些其他类似的线程，但没有一个有帮助。你能否告诉我我错过了什么，或者这甚至是应该这样做的方式。非常感谢您的意见。

谢谢， 迈克

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

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"signUpFields" forIndexPath:indexPath];

// Configure the cell...
if (indexPath.row == 0){
    //self.firstName = [[UITextField alloc] initWithFrame:CGRectMake(5, 0, 280, 21)];
    self.firstName = [[UITextField alloc] initWithFrame:CGRectMake(120, 13, 375, 30)];
    self.firstName.placeholder = @"First Name";
    self.firstName.autocorrectionType = UITextAutocorrectionTypeNo;
    [self.firstName setClearButtonMode:UITextFieldViewModeWhileEditing];
    //cell.accessoryView = self.firstName;
    [cell.contentView addSubview:self.firstName];
}

if (indexPath.row == 1){
    self.lastName = [[UITextField alloc] initWithFrame:CGRectMake(120, 13, 375, 30)];
    self.lastName.placeholder = @"Last Name";
    self.lastName.autocorrectionType = UITextAutocorrectionTypeNo;
    [self.lastName setClearButtonMode:UITextFieldViewModeWhileEditing];
    //cell.accessoryView = self.lastName;
    [cell.contentView addSubview:self.lastName];
}

if (indexPath.row == 2){
    self.emailId = [[UITextField alloc] initWithFrame:CGRectMake(120, 13, 375, 30)];
    self.emailId.placeholder = @"Email Id";
    self.emailId.autocorrectionType = UITextAutocorrectionTypeNo;
    [self.emailId setClearButtonMode:UITextFieldViewModeWhileEditing];
    //cell.accessoryView = self.emailId;
    [cell.contentView addSubview:self.emailId];
}

if (indexPath.row == 3){
    self.password = [[UITextField alloc] initWithFrame:CGRectMake(120, 13, 375, 30)];
    self.password.placeholder = @"Password";
    self.password.secureTextEntry = YES;
    self.password.autocorrectionType = UITextAutocorrectionTypeNo;
    [self.password setClearButtonMode:UITextFieldViewModeWhileEditing];
    //cell.accessoryView = self.password;
    [cell.contentView addSubview:self.password];
}

self.firstName.delegate = self;
self.lastName.delegate = self;
self.emailId.delegate = self;
self.password.delegate = self;

[self.signUpTable addSubview:self.firstName];
[self.signUpTable addSubview:self.lastName];
[self.signUpTable addSubview:self.emailId];
[self.signUpTable addSubview:self.password];

cell.selectionStyle = UITableViewCellSelectionStyleNone;
return cell;

}

Answer 1

试试这个..

     - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    {
        static NSString *CellIdentifier = @"Cell";
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
        if (cell == nil) {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        }

       if (indexPath.row == 0){
    //self.firstName = [[UITextField alloc] initWithFrame:CGRectMake(5, 0, 280, 21)];
    self.firstName = [[UITextField alloc] initWithFrame:CGRectMake(120, 13, 375, 30)];
    self.firstName.placeholder = @"First Name";
    self.firstName.autocorrectionType = UITextAutocorrectionTypeNo;
    [self.firstName setClearButtonMode:UITextFieldViewModeWhileEditing];
    //cell.accessoryView = self.firstName;
    [cell addSubview:self.firstName];
}

if (indexPath.row == 1){
    self.lastName = [[UITextField alloc] initWithFrame:CGRectMake(120, 13, 375, 30)];
    self.lastName.placeholder = @"Last Name";
    self.lastName.autocorrectionType = UITextAutocorrectionTypeNo;
    [self.lastName setClearButtonMode:UITextFieldViewModeWhileEditing];
    //cell.accessoryView = self.lastName;
    [cell addSubview:self.lastName];
}

if (indexPath.row == 2){
    self.emailId = [[UITextField alloc] initWithFrame:CGRectMake(120, 13, 375, 30)];
    self.emailId.placeholder = @"Email Id";
    self.emailId.autocorrectionType = UITextAutocorrectionTypeNo;
    [self.emailId setClearButtonMode:UITextFieldViewModeWhileEditing];
    //cell.accessoryView = self.emailId;
    [cell addSubview:self.emailId];
}

if (indexPath.row == 3){
    self.password = [[UITextField alloc] initWithFrame:CGRectMake(120, 13, 375, 30)];
    self.password.placeholder = @"Password";
    self.password.secureTextEntry = YES;
    self.password.autocorrectionType = UITextAutocorrectionTypeNo;
    [self.password setClearButtonMode:UITextFieldViewModeWhileEditing];
    //cell.accessoryView = self.password;
    [cell addSubview:self.password];
}

self.firstName.delegate = self;
self.lastName.delegate = self;
self.emailId.delegate = self;
self.password.delegate = self;


cell.selectionStyle = UITableViewCellSelectionStyleNone;

        return cell;
    }

不需要在表格视图中再次添加文本视图，这是错误的。试试这个，这对你有用，但更好的是你应该创建一个自定义 Cell 并使用。这是最好的方法，因为您可以随心所欲地使用 Cell。

Answer 2

不要将它们添加为子视图，将它们设置为单元格的附属视图。

- (UITextField*)getTextField{
    UITextField *tf = [[UITextField alloc] initWithFrame:CGRectMake(0, 0, 20, 35)];
    tf.delegate = self;
    tf.textColor        = [UIColor colorWithRed:.231 green:.337 blue:.533 alpha:1];
    tf.autocorrectionType = UITextAutocorrectionTypeNo;
    tf.borderStyle = UITextBorderStyleNone;
    tf.frame = CGRectMake(0, 20, 170, 30);
    tf.clearButtonMode = UITextFieldViewModeWhileEditing;
    tf.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
    tf.font = [UIFont systemFontOfSize:13];
    return tf;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
        cell.textLabel.font = [UIFont systemFontOfSize:13];
        cell.detailTextLabel.font = [UIFont systemFontOfSize:13];
        cell.detailTextLabel.numberOfLines = 2;
    }

    if (indexPath.section == 0) {

        UITextField *tf = (UITextField*)cell.accessoryView;
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        cell.textLabel.numberOfLines = 2;
        tf                  = [self getTextField];
        cell.accessoryView = cell.editingAccessoryView = tf;
        [((UITextField*)cell.accessoryView) setBorderStyle:self.tableView.editing ? UITextBorderStyleRoundedRect : UITextBorderStyleNone];
        [((UITextField*)cell.accessoryView) setUserInteractionEnabled:self.tableView.editing ? YES : NO];
        [((UITextField*)cell.accessoryView) setTextAlignment:!self.tableView.editing ? UITextAlignmentRight : UITextAlignmentLeft];
        ((UITextField*)cell.accessoryView).tag = indexPath.row;
    }

    return cell;
}

这个想法是单元格每次出现在屏幕上时都会重新绘制，来自屏幕外，如果您添加带有addSubview:的文本字段，它也会每次添加它。你可以这样做，但是你必须清除单元格的contentView 子视图，但这需要额外的工作、cpu 和内存使用，并不是说这是最不优雅的解决方案。

Answer 3

看起来您只有四个要显示的单元格。这是一个静态案例，单元格不会改变，您应该在 xib/storyboard 中静态创建这个 tableView 及其单元格。这是这里的首选方式。

如果您真的想以编程方式执行此操作，请事先创建四个具有您想要的行为的 UITableViewCell。将它们保存在一个数组中。 cellForRowAtIndex 内部路径return cellArray[indexPath.row];

请注意，这是最好的方法，因为您只有四个 tableViewCell。 仅当您的单元格数量超过屏幕上一次可以容纳的单元格时，ReuseIdentifiers 才会派上用场。因此，在您的情况下，您实际上从未重复使用单元格。

Answer 4

保留这个并尝试一下，

- (UITableViewCell *)tableView:(UITableView *)tableView
         cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *MyIdentifier = [NSString stringWithFormat:@"%d%d",indexPath.row,indexPath.section];


    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];

    if (cell == nil)
    {
     //your stuff.
    }
}

Answer 5

尝试使用这个......并且没有必要将这些文本字段添加到tableview。所以请删除一些代码..

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

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"signUpFields" forIndexPath:indexPath];

// Configure the cell...
if (indexPath.row == 0){
    //self.firstName = [[UITextField alloc] initWithFrame:CGRectMake(5, 0, 280, 21)];
    self.firstName = [[UITextField alloc] initWithFrame:CGRectMake(120, 13, 375, 30)];
    self.firstName.placeholder = @"First Name";
    self.firstName.autocorrectionType = UITextAutocorrectionTypeNo;
    [self.firstName setClearButtonMode:UITextFieldViewModeWhileEditing];
    //cell.accessoryView = self.firstName;
    [cell addSubview:self.firstName];
}

if (indexPath.row == 1){
    self.lastName = [[UITextField alloc] initWithFrame:CGRectMake(120, 13, 375, 30)];
    self.lastName.placeholder = @"Last Name";
    self.lastName.autocorrectionType = UITextAutocorrectionTypeNo;
    [self.lastName setClearButtonMode:UITextFieldViewModeWhileEditing];
    //cell.accessoryView = self.lastName;
    [cell addSubview:self.lastName];
}

if (indexPath.row == 2){
    self.emailId = [[UITextField alloc] initWithFrame:CGRectMake(120, 13, 375, 30)];
    self.emailId.placeholder = @"Email Id";
    self.emailId.autocorrectionType = UITextAutocorrectionTypeNo;
    [self.emailId setClearButtonMode:UITextFieldViewModeWhileEditing];
    //cell.accessoryView = self.emailId;
    [cell addSubview:self.emailId];
}

if (indexPath.row == 3){
    self.password = [[UITextField alloc] initWithFrame:CGRectMake(120, 13, 375, 30)];
    self.password.placeholder = @"Password";
    self.password.secureTextEntry = YES;
    self.password.autocorrectionType = UITextAutocorrectionTypeNo;
    [self.password setClearButtonMode:UITextFieldViewModeWhileEditing];
    //cell.accessoryView = self.password;
    [cell addSubview:self.password];
}

self.firstName.delegate = self;
self.lastName.delegate = self;
self.emailId.delegate = self;
self.password.delegate = self;

cell.selectionStyle = UITableViewCellSelectionStyleNone;
return cell;

}

Answer 6

无需编写更多单元格，只需创建一个带有文本字段的自定义单元格。为每个文本字段指定标签，并在 numberOfRowsIntheSections 中设置行数，然后它将显示您需要多少单元格。我想它会对你有所帮助。

Answer 7

在您按照我的回答之前，我想告诉您以下代码不利于内存管理，因为它会为UITableView 的每一行创建新单元格，所以要小心。

但最好使用，当UITableView 有有限的行（可能是 50-100 左右） 那么下面的代码对你的情况有帮助，使用它，如果它适合你.

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

    NSString *CellIdentifier = [NSString stringWithFormat:@"S%1dR%1d",indexPath.section,indexPath.row];
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if(cell == nil)
    {
        cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];


         /// Put/Create  your UITextField or any Controls here


     }

    return cell;
}

Answer 8

@Mike ：首先，我建议您使用 StoryBoard 或 Nib 文件。

如果你使用这个，那么你可以使用下面的代码

- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];

     UITextField *txtField = (UITextField *)[cell viewWithTag:1];
     txtField.text = @"Latest";

     return cell;
}

您可以根据行号设置文本。

如果你想在运行时添加 UITextField。那么你可以使用下面的代码。

- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
     UITextField *txtField = [[UITextField alloc] initWithFrame:CGRectMake(165.0, 7.0, 150.0, 30.0)];
     txtField.text = @"Latest";
     [cell.contentView addSubview:txtField];
     return cell;
}

您可以分配不同的标签，并根据标签存储这些值。