ios - 以编程方式向 uitableviewcell 添加文本字段不起作用

ios - adding text fields to uitableviewcell programmatically not working

提问by Mike G

Rookie ios question. I am trying to create a sign up form using a table view controller. I am trying add textfields to each cell programmatically in the cellForRowAtIndexPath method but all my text fields seem to getting created on the first cell - one overlapping the other. Here is my code.

菜鸟ios问题。我正在尝试使用表视图控制器创建注册表单。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，但我所有的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。

Here is how my cells are rendering. I think I am doing something goofy with the part that is reusing the cells. I did check some some other similar threads on stackoverflow but none of them helped. Could you please tell me what i am missing or is this even the way this is supposed to be done. Your inputs are really appreciated.

这是我的单元格的渲染方式。我想我对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。你能告诉我我缺少什么吗，或者这是应该完成的方式。非常感谢您的意见。

Thanks, Mike

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;

}

回答by Suryakant Sharma

Try this..

尝试这个..

     - (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;
    }

no need to add again text view in table view, this is wrong. Try this, this will work for you but better you should create a custom Cell and use. That is the best way to do it, because you can use whatever you want with 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单元并使用。这是最好的方法，因为你可以在 Cell 中使用任何你想要的东西。

回答by Danut Pralea

Don't add them as subviews, set them as the cell's accessory view.

不要将它们添加为子视图，将它们设置为单元格的附件视图。

- (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;
}

The idea is that the cell is re-drawn each time it appears on screen, coming from off the screen and if you add the text field with addSubview:, it will add it each time as well. You COULD do it, but then you have to clear the cell's contentViewof subviews, but that requires extra work, cpu and memory use, and not to say it's the least elegant solution.

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 的文本字段addSubview:，它也会每次添加它。您可以这样做，但是您必须清除contentView子视图的单元格，但这需要额外的工作、cpu 和内存使用，而且并不是说这是最不优雅的解决方案。

回答by JohnVanDijk

Looks like you have just four cells you want to display. This is a static case, the cells don't change, you should create this tableView and its cells statically in the xib/storyboard. That is the preferred way here.

看起来您只想显示四个单元格。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。

If you really want to do it programmatically, create four UITableViewCells with the behavior you want before hand. Keep them in an array. Inside cellForRowAtIndex path return cellArray[indexPath.row];

如果您真的想以编程方式进行操作，请事先创建四个具有您想要的行为的 UITableViewCells。将它们放在一个数组中。内部 cellForRowAtIndex 路径return cellArray[indexPath.row];

Note this is the best approach only because you have just four tableViewCells. ReuseIdentifiers come in handy only if you have more cells than can be accommodated on the screen at once. So in your case, you never actually reuse the cells.

请注意，这是最好的方法，因为您只有四个 tableViewCell。ReuseIdentifiers 仅在您的单元格数量超过屏幕一次可容纳的数量时才派上用场。所以在你的情况下，你从来没有真正重用过这些单元格。

回答by Balu

keep this one and try it,

留着这个试试

- (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.
    }
}

回答by Dharmbir Singh

Try to use this one ...And there is no need to add these textfield to tableview. So please remove some code..

尝试使用这个......并且不需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;

}

回答by Ganesh

Instead of writing more cells just create one custom cell with textfield.Give the tag for each textfield and also set the count of rows in numberOfRowsIntheSections then it will display the cells how much you need. I think it will helps you.

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，然后它将显示单元格您需要多少。我认为它会帮助你。

回答by iPatel

Before You follow my Answer i wnat to tell you that following code is bad for memory management because it will create new cell for each rows of UITableView, so be careful for it.

在您按照我的回答之前，我想告诉您以下代码对内存管理不利，因为它会为 的每一行创建新单元格UITableView，因此请小心。

But it is better to use, When UITableViewHave Limited rows (about 50-100 may be )then following code is helpful in your case, use it, If it is suitable for you.

但是最好使用，当UITableView行数有限时（大约 50-100行），那么以下代码对您的情况有帮助，请使用它，如果它适合您。

 - (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;
}

回答by iOS_Developer

@Mike : First of all I will suggest you to go with StoryBoard or Nib files.

@Mike：首先，我建议您使用 StoryBoard 或 Nib 文件。

If you use this, then you can use following code

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;
}

Based on row number you can set text.

您可以根据行号设置文本。

If you want to add the UITextField at run time. then you can use following code.

如果要在运行时添加 UITextField。那么您可以使用以下代码。

- (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;
}

You can assign different tag and based on tags you can store those values.

您可以分配不同的标签，并根据标签存储这些值。