键盘使UIView缓慢出现时？

Question

我有一个动作，允许我提出一个ModalViewController并显示UITextField作为第一个响应者，问题是当这个ModalViewController会出现它需要一点时间，原因是键盘，当我抓住代码viewDidAppear键盘需要一点时间才能显示出来，所以我怎么才能让UIViewController快速出现？

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

的ModalViewController的viewWillAppear中：

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

    [findTextField becomeFirstResponder]; 
} 

Answer 1

尝试这样的viewWillAppear。

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

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