1

我想在调用-makeKeyAndVisible应用程序窗口之前以模态方式呈现一个视图控制器。但是，此代码仅显示mainNav视图控制器：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    MainViewController *main = [[MainViewController alloc] init];
    UINavigationController *mainNav = [[UINavigationController alloc] initWithRootViewController:main];

    if ([[NSUserDefaults standardUserDefaults] boolForKey:@"Restore"]) 
    {
        DetailViewController *detail = [[DetailViewController alloc] init];
        UINavigationController *detailNav = [[UINavigationController alloc] initWithRootViewController:detail];

        // changing main to mainNav does not help
        [main presentModalViewController:learnNav animated:NO];

        [detailNav release]; [detail release];

    }

    self.window.rootViewController = mainNav;

    [main release]; [mainNav release];

    [self.window makeKeyAndVisible];

    return YES;
}

我错过了什么？

4

1 回答 1

3

你最好让窗口出现，然后用animated=NO. 在实例化和显示其他所有内容之前呈现模态视图有什么意义？

编辑

为了尝试使您的代码正常工作，这里有一些提示。试试这个：

[mainNav presentModalViewController:learnNav animated:NO];

或这个：

[main.navigationController presentModalViewController:learnNav animated:NO];

我会说这两种方法如果放在makeKeyAndVisible通话之后效果最好。

于 2011-06-06T12:29:19.827 回答