如何从inputAccessoryView按钮单击获取UITextField

Question

我有一个动态的数字UITextFields都有一个inputAccessoryView.它由UIToolbar一个按钮组成.按下此按钮时,它会调用一个方法,但是,在此方法中,我需要能够访问底层UITextField.

请问有人可以告诉我这是怎么回事吗？

// Create the toolbar controls
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(navigationBarDoneButtonPressed:)];
UIBarButtonItem *flexibleSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];

// Setup the toolbar
navigationToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(10.0, 0.0, 310.0, 40.0)];
[navigationToolbar setItems:@[flexibleSpace, doneButton]];

// In a UITableView I create a number of cells which contain UITextFields....

// This is the method that gets called when a user presses the done button
- (void)navigationBarDoneButtonPressed:(id)sender
{
    NSLog(@"Based on sender I need to access the underlying UITextField.");
}

Answer 1

您可以跟踪UITextField变量中当前的焦点,并在inputAccesoryView方法中使用该变量:

在你的.h文件中:确保你符合UITextFieldDelegate协议:

@interface MyViewController : UIViewController <UITextFieldDelegate>

并添加此属性:

@property (assign, nonatomic) UITextField *activeTextField;

在.m文件中:创建动态文本字段时:

...
theTextField.delegate=self;
...

并添加UITextFieldDelegate协议的这些实现:

- (void)textFieldDidBeginEditing:(UITextField *)textField
{
    self.activeTextField = textField;
}
- (void)textFieldDidEndEditing:(UITextField *)textField
{
    self.activeTextField = nil;
}

现在,在您调用的方法中inputAccesoryView:

- (void)navigationBarDoneButtonPressed:(id)sender{//Just an example
    self.activeTextField.text=@"Test";
}