在uitableviewcell中以编程方式添加文本字段无效

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.

新秀ios的问题。我正在尝试使用表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textfields，但我的所有文本字段似乎都是在第一个单元格上创建的——一个单元格与另一个单元格重叠。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 * 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.

这是我的单元格渲染的方式。我认为我在用重复使用细胞的部分做一些傻事。我确实在*上检查了其他一些类似的线程，但是没有一个对我有帮助。你能告诉我我遗漏了什么吗?或者这就是我们应该做的。非常感谢您的输入。

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;

}

8 个解决方案

#1

Try this..

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;
    }

no need to add again text view in table view this is wrong. try this this will work for you but better you create custom Cell and use that is the best way to do it because you can use what ever you want with Cell.

不需要再在表视图中添加文本视图这是错误的。尝试一下，这对您是有用的，但是最好创建自定义单元格并使用这是最好的方法，因为您可以对单元格使用任何您想要的东西。

#2

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;
}

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 contentView of subviews, but that requires extra work, cpu and memory use, and not to say it's the least elegant solution.

它的想法是，每次出现在屏幕上的时候，单元格会被重新绘制，从屏幕上显示出来，如果你添加了addSubview的文本字段，它也会每次都添加它。您可以这样做，但是您必须清除单元格的子视图的contentView，但是这需要额外的工作、cpu和内存的使用，而且不能说这是最不优雅的解决方案。

#3

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.

看起来你只需要显示四个单元格。这是一个静态情况，单元格不会改变，您应该在xib/storyboard中静态地创建这个tableView及其单元格。这是这里的首选方法。

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];

如果您真的想要以编程的方式来实现它，那么在手工之前创建四个uitableviewcell，并使用您想要的行为。将它们保存在数组中。在cellForRowAtIndex路径内返回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.

注意，这是最好的方法，因为只有4个tableviewcell。只有当你的单元格比一次在屏幕上显示的要多时，reuseidentifier才能派上用场。所以在你的例子中，你从来没有真正地重用单元格。

#4

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.
    }
}

#5

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

试着用这个……不需要将这些textfield添加到tableview中。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;

}

#6

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.

不要编写更多单元格，只需使用textfield创建一个自定义单元格。为每个textfield提供标记，并设置numberOfRowsIntheSections中的行数，然后它将显示您需要多少单元格。我想这对你有帮助。

#7

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.

在您遵循我的答案之前，我想告诉您，遵循代码不利于内存管理，因为它将为UITableView的每一行创建新单元格，所以要小心。

But it is better to use, When UITableView Have 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，如果UITableView有有限的行(大约50-100行)，那么遵循代码对您的情况是有帮助的，如果它适合您，那么就使用它。

 - (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;
}

#8

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

@Mike:首先我建议你使用故事板或者Nib文件。

If you use this, then you can use following code

如果您使用这个，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 *)[cell viewWithTag:1];
     txtField.text = @"Latest";

     return cell;
}

Based on row number you can set text.

根据行号可以设置文本。

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

如果您想在运行时添加UITextField。然后可以使用以下代码。

- (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记，并基于标记可以存储这些值。