UINavigationItem.titleView canBecomeFirstResponder？

Question

我在UINavigationItem.titleView中添加了一个自定义的UITextField。但它不是becomeFirstResponder。为什么会这样呢？

- (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]
}

敬请指教。

先谢谢你，巴拉蒂。

Answer 1

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

Answer 2

您还需要遵循UITextFieldDelegate协议。我认为你没有遵守协议。

在.h文件中(例如)

@interface RootViewController : UITableViewController<UITextFieldDelegate>

@end

Answer 3

试试这个：

[titleTextField becomeFirstResponder];

然后：

self.navigationItem.titleView = titleTextField;

告诉我如果幸运的话..。