UITableViewCell中的UITextField和模式视图中的验证 [英] UITextField in UITableViewCell and validation in modal view

问题描述

我正在使用此stackoverflow发布中描述的方法来检索值来自文本字段。我的问题是表格视图是以模态显示的，并且我有一个保存按钮，用于验证输入并将其存储。

问题在于，当用户单击 UIBarButtonItem 时，不会不调用 textFieldDidEndEditing 方法（=保存按钮，它会关闭模式视图。）

在这种情况下（当用户要保存输入时），我想对其进行验证。但是这些值存储在 textFieldDidEndEditing 的属性中。由于未调用此方法，因此我无法正确验证输入值。

有人对此有任何提示或解决方案吗？

谢谢！

解决方案

好的，我们开始：

感谢@Lefteris及其存储当前索引的想法。由于无法将索引存储到 tag 属性中，因此我决定存储活动的 indexPath 以及有效的 textField 。 （我知道，对 UITextField 的引用就足够了，但是我需要其他内容）

第一个我添加了这两个属性：

  @property（非原子的，强的）NSIndexPath * activeIndexPath; 
属性（非原子的，强的）UITextField * activeTextField; 
  

然后我实现了 textFieldDidBeginEditing：和 textFieldDidEndEditing： of UITextFieldDelegate 。

 -（void）textFieldDidBeginEditing：（UITextField *）textField 
 {
 NSIndexPath * indexPath =（NSIndexPath *）[self.tableView indexPathForCell：（UITableViewCell *）[[textField superview] superview]]; 
 
 self.activeTextField = textField; 
 self.activeIndexPath = indexPath; 
} 
 
-（void）textFieldDidEndEditing：（UITextField *）textField 
 {
 NSString * input = textField.text; 
 
 //将输入文本字段中的值假定为相应的属性
 [self承担Input：input withIndexPath：self.activeIndexPath]; 
 
 self.activeTextField = nil; 
 self.activeTextField = nil; 
} 
  

在 textFieldDidEndEditing中：我将值存储到属性中（例如 self.firstName ， self.lastName ，等等。） 。）使用方法 [self承担Input：input withIndexPath：self.activeIndexPath]; 。

在我的 saveAction -方法是从当前活动的 TextField 中存储值。

 -（IBAction）saveButtonClicked：（UIBarButtonItem *）sender 
 {
 //假设来自活动字段的输入（didEndEditing _not_现在被调用！）
 [self承担Input：self.activeTextField.text withIndexPath：self.activeIndexPath]; 
 
 //测试输出
 NSLog（@ firstName：％@，self.firstName）; 
 NSLog（@ lastName：％@，self.lastName）; 
 NSLog（@电子邮件：％@，self.email）; 
 ... 
} 
  

...就是这样！

希望有帮助！感谢@Lefteris的投入。

最好，
Chris

I am using the approach described in this stackoverflow posting to retrieve values from a textfield. My problem is that the tableview is presented modally and I have a save button that validates the input and stores it.

The problem is that the textFieldDidEndEditing method is not called when the user clicks an UIBarButtonItem (= the save button, which closes the modal view).

In this event (when the user wants to save the input) I would like to validate it. But the values are stored in properties in the textFieldDidEndEditing. Due to the fact that this method is not called, I cannot validate the input values correctly.

Does anyone have a hint or solution on this?

Thanks in advance!

解决方案

Okay, here we go:

Thanks to @Lefteris and his idea with storing the current index. Due to the fact that I cannot store the index into the tag attribute I decided to store the active indexPath and additionally the active textField. (I know, a reference to the UITextField would have been enough but I needed it for other stuff)

First I have added these two properties:

@property (nonatomic, strong) NSIndexPath *activeIndexPath;
@property (nonatomic, strong) UITextField *activeTextField;

Then I implemented textFieldDidBeginEditing: and textFieldDidEndEditing: of UITextFieldDelegate.

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    NSIndexPath *indexPath = (NSIndexPath*)[self.tableView indexPathForCell:(UITableViewCell*)[[textField superview] superview]];

    self.activeTextField = textField;
    self.activeIndexPath = indexPath;
}

- (void)textFieldDidEndEditing:(UITextField *)textField 
{
    NSString *input = textField.text;    

    //assuming values from input textfield into corresponding properties
    [self assumeInput:input withIndexPath:self.activeIndexPath];

    self.activeTextField = nil;
    self.activeTextField = nil;
}

In textFieldDidEndEditing: I am storing the values into my properties (such as self.firstName, self.lastName, and so on...) by using the method [self assumeInput:input withIndexPath:self.activeIndexPath];.

In my saveAction-Method I am storing the value from the currently active TextField.

- (IBAction)saveButtonClicked:(UIBarButtonItem *)sender 
{    
    //assuming input from active field (didEndEditing _not_ called right now!)
    [self assumeInput:self.activeTextField.text withIndexPath:self.activeIndexPath];

    //test output
    NSLog(@"firstName: %@", self.firstName);
    NSLog(@"lastName: %@", self.lastName);
    NSLog(@"email: %@", self.email);
    ...
}

... and that's it!

Hope it helps! Thanks to @Lefteris for his input.

Best, Chris

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