在自定义 UITableViewCell 中访问 UITextField [英] Accessing UITextField in a custom UITableViewCell

问题描述

我有一个在 IB 中创建的 UITableViewCell(带有关联的 UITableViewCell 子类，.m & .h)，其中包含一个 UITextField.这个 UITextField 连接到 UITableViewCell 子类中的一个 IBOutlet 并且还有一个属性.在我的表视图控制器中，我使用带有以下代码的自定义单元格:

I have a UITableViewCell (with associated UITableViewCell sub class, .m & .h) created in IB which contains a UITextField. This UITextField is connected up to an IBOutlet in the UITableViewCell sub class and also has a property. In my table view controller I am using this custom cell with the following code:

// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"textfieldTableCell"];
    if (cell == nil) {
        // Create a temporary UIViewController to instantiate the custom cell.
        UIViewController *temporaryController = [[UIViewController alloc] initWithNibName:@"TextfieldTableCell" bundle:nil];
        // Grab a pointer to the custom cell.
        cell = (TextfieldTableCell *)temporaryController.view;  
        // Release the temporary UIViewController.
        [temporaryController release];
    }

    return cell;

}

UITextField 显示正常，按预期点击时键盘会弹出，但我如何访问(获取 .text 属性)每行包含的 UITextField?以及如何处理 UITextFields 的textFieldShouldReturn"方法?

The UITextField displays fine and the keyboard pops up when clicked as expected, but how do I access (get .text property) the UITextField that each row contains? and also how do I handle the 'textFieldShouldReturn' method of the UITextFields?

推荐答案

我认为 OP 试图理解的是，一旦用户将数据输入到每个字段中，如何访问 UITextField 值.按照@willcodejavaforfood 的建议，在创建单元格时，这将不可用.

I think what the OP is trying to understand is how to access the UITextField value once the user has entered data into each fields. This will not be available at the time the cells are created as suggested by @willcodejavaforfood.

我一直在实现一个表单，并试图让它尽可能地方便用户使用.这是可行的，但请注意，根据您拥有的 UITableViewCells/UITextFields 的数量，它可能会变得非常复杂.

I've been implementing a form and trying to make it as user friendly as possible. It is doable but be aware that it can get quite convoluted depending on the number of UITableViewCells / UITextFields you have.

首先回答你的问题:访问 UITextField 的值:

Firstly to your question re: accessing the values of UITextField:

1) 使您的视图控制器成为

1) Make your view controller a <UITextFieldDelegate>

2) 实现以下方法:

- (void) textFieldDidEndEditing:(UITextField *)textField {
    NSIndexPath *indexPath = [self.tableView indexPathForCell:(CustomCell*)[[textField superview] superview]]; // this should return you your current indexPath

        // From here on you can (switch) your indexPath.section or indexPath.row
        // as appropriate to get the textValue and assign it to a variable, for instance:
    if (indexPath.section == kMandatorySection) {
        if (indexPath.row == kEmailField) self.emailFieldValue = textField.text;
        if (indexPath.row == kPasswordField) self.passwordFieldValue = textField.text;
        if (indexPath.row == kPasswordConfirmField) self.passwordConfirmFieldValue = textField.text;
    }
    else if (indexPath.section == kOptionalSection) {
        if (indexPath.row == kFirstNameField) self.firstNameFieldValue = textField.text;
        if (indexPath.row == kLastNameField) self.lastNameFieldValue = textField.text;
        if (indexPath.row == kPostcodeField) self.postcodeFieldValue = textField.text;
    }   
}

我也使用类似的语法来确保当前编辑的字段可见:

I also use a similar syntax to make sure the current edited field is visible:

- (void) textFieldDidBeginEditing:(UITextField *)textField {
    CustomCell *cell = (CustomCell*) [[textField superview] superview];
    [self.tableView scrollToRowAtIndexPath:[self.tableView indexPathForCell:cell] atScrollPosition:UITableViewScrollPositionMiddle animated:YES];
}

最后，您可以以类似的方式处理 textViewShouldReturn::

And finally, you can handle textViewShouldReturn: in a similar way:

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    NSIndexPath *indexPath = [self.tableView indexPathForCell:(CustomCell*)[[textField superview] superview]];
    switch (indexPath.section) {
        case kMandatorySection:
        {
            // I am testing to see if this is NOT the last field of my first section
            // If not, find the next UITextField and make it firstResponder if the user
            // presses ENTER on the keyboard
            if (indexPath.row < kPasswordConfirmField) {
                NSIndexPath *sibling = [NSIndexPath indexPathForRow:indexPath.row+1 inSection:indexPath.section];
                CustomCell *cell = (CustomCell*)[self.tableView cellForRowAtIndexPath:sibling];
                [cell.cellTextField becomeFirstResponder];
            } else {
                // In case this is my last section row, when the user presses ENTER, 
                // I move the focus to the first row in next section
                NSIndexPath *sibling = [NSIndexPath indexPathForRow:kFirstNameField inSection:kOptionalSection];
                MemberLoginCell *cell = (MemberLoginCell*)[self.memberTableView cellForRowAtIndexPath:sibling];
                [cell.cellTextField becomeFirstResponder];
            }
            break;
        }           
        ...
}

这篇关于在自定义 UITableViewCell 中访问 UITextField的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！