Xcode4 情节提要导航项链接到uiviewcontroller

我创建了一个拆分视图项目，在iPhone的故事板上，我将一个条形按钮项目拖动到导航右侧，并更改样式添加，我将视图控制器拖动到故事板，因此我使用控件拖动来构建链接，并更改uiviewcontroller的自定义类“AddViewController”，当我运行项目并按下DetailViewController时，它是黑色视图

我已经在AddViewController.m上输入了代码

-(void) viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard_iPhone"        bundle:nil];
    UIViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"AddViewController"];
    [vc setModalPresentationStyle:UIModalPresentationCurrentContext];
    [self presentModalViewController:vc animated:YES];
}

我找到了原因 在我创建的“AddCreateViewController”上，我应该对函数进行注释

- (void)loadView
{
    // If you create your views manually, you MUST override this method and use it to create your views.
    // If you use Interface Builder to create your views, then you must NOT override this method.
}