ios – 如何使用自定义inputView获取UITextFieldDelegate.shouldChangeCharactersInRange？

我有一个自定义键盘,我用它来编辑myTextField中的文本,它工作得很好.但是,我永远无法使用我的自定义键盘执行shouldChangeCharactersInRange委托.它在我使用我的实际键盘时执行(显然不是默认的iPhone键盘,因为我设置了myTextField.inputView = numberPad.view).我该怎么做才能使用自定义键盘激活shouldChangeCharactersInRange委托？顺便说一句,自定义键盘只是一堆按钮.

- (void) numberPadPressed: (UIButton *)sender {
    [myTextField insertText:[[NSnumber numberWithInt:sender.tag] stringvalue]];
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRangE)range replacementString:(NSString *)String {
    NSString *resulTingString = [textField.text StringByreplacingCharactersInRange: range withString: String];
    NSLog(@"shouldChangeCharactersInRange: %@",resulTingString);
    return true;
}

- (void)viewDidLoad {
    myTextField.text = @"";
    myTextField.inputView = numberPad.view;
    myTextField.delegate = self;
    [myTextField becomeFirstResponder];
}

[textField addTarget:self action:@SELEctor(myTextfieldChangedMethod:) forControlEvents:UIControlEventEdiTingChanged];

[textField sendActionsForControlEvents:UIControlEventTouchUpInside];