iphone - UINavigationItem.titleView可以成为FirstResponder吗？

Question

我有一个自定义的 UITextField 添加到 UINavigationItem.titleView。但它不是becomeFirstResponder。为什么会这样？

- (void) viewDidLoad
{
    [super viewDidLoad];
    UITextField *titleTextField = [[UITextField alloc] initWithFrame:CGRectMake(65.0f, 8.0f, 160.0f, 30.0f)];
    titleTextField.text = @"Untitled";
    titleTextField.textAlignment = UITextAlignmentCenter;
    titleTextField.textColor = [UIColor whiteColor];
    titleTextField.font = [UIFont boldSystemFontOfSize:20.0f];
    //titleTextField.backgroundColor = [UIColor redColor];
    titleTextField.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
    titleTextField.delegate = self;
    titleTextField.tag = 2;
    self.navigationItem.titleView = titleTextField;
    [titleTextField becomeFirstResponder]
}

请指教。

提前致谢， 巴拉蒂。

Answer 1

尝试 [self.navigationItem.titleView becomeFirstResponder]; 而不是 [titleTextField becomeFirstResponder];