鍵盤在出現時使UIView緩慢？

Question

我有一個動作可以讓我呈現一個ModalViewController並將UITextField顯示為第一響應者，問題是此ModalViewController何時出現需要花費一些時間，原因是鍵盤，並且當我將代碼抓取到viewDidAppear時鍵盤需要一些時間才能顯示出來，所以如何使UIViewController快速出現？

- (IBAction)goToModalViewController
{    
    ModalSearchViewController *msvc = [[ModalSearchViewController alloc] init];
    self.msvc.context = context;
    self.msvc.delegate = self;
    [self.msvc setModalTransitionStyle:UIModalTransitionStyleCrossDissolve ];                                                                                                                                                                                                                                                                                                                                                       
    [self presentModalViewController:msvc animated:YES];
}

ModalViewController的viewWillAppear：

- (void)viewWillAppear:(BOOL)animated
{
   [super viewWillAppear:YES];

   [findTextField becomeFirstResponder]; 
}

Answer 1

在viewWillAppear嘗試這樣。

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    //[findTextField becomeFirstResponder]; 
    [findTextField performSelector:@selector(becomeFirstResponder) withObject:nil afterDelay:0.3];
}