xcode delay

[iOS Dev] 自動出現鍵盤並延遲出現 UIKeyboard auto show and delay

- (void)enableKeyboard {
 [self.textField becomeFirstResponder];
}

- (void)viewDidLoad {
    [self performSelector:@selector(enableKeyboard) withObject:nil afterDelay:.3]; 
    [super viewDidLoad];
}