在appdelegate中呈现多个模态视图 [英] present more than one modalview in appdelegate

问题描述

我希望在应用程序收到的每个推送消息之后呈现一个modalviewcontroller：应用程序:( UIApplication *）应用程序didReceiveRemoteNotification：（NSDictionary *）userInfo

I want to present a modalviewcontroller after every push-message the app recieves in "application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo"

I像这样呈现viewcontroller：

I present the viewcontroller like this:

ReleaseViewController *viewController = [[ReleaseViewController alloc] init];
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:viewController];
[self.window.rootViewController presentModalViewController:navController animated:YES];

因此，当另一个推送消息到来且旧的ModalViewController仍然可见时，我想呈现一个新的modalviewcontroller过去了。但它不起作用。没有发生任何事情，控制台只是说（我认为它是iOS 6 Beta的调试消息）：

So when another push-message arrives and the old ModalViewController is still visibile, I want to present a new modalviewcontroller over the old. But it doesn't work. Nothing happened and the console just says (I think it's a debug-message of iOS 6 Beta):

Warning: Attempt to present <UINavigationController: 0x1dde6c30> on <UINavigationController: 0x1dd73c00> whose view is not in the window hierarchy!

我做错了什么？

PS：我不想解雇旧的ViewController，我希望它们能够堆叠。

PS: I don't want to dismiss the old ViewController, I want them to stack.

谢谢！

推荐答案

您可以获得视图控制器的顶部，然后从该顶视图控制器呈现一个新模态

You can get top of your view controllers, then present a new modal from that top view controller

- (UIViewController *)topViewController:(UIViewController *)rootViewController
{
    if (rootViewController.presentedViewController == nil) {
        return rootViewController;
    }

    if ([rootViewController.presentedViewController isMemberOfClass:[UINavigationController class]]) {
        UINavigationController *navigationController = (UINavigationController *)rootViewController.presentedViewController;
        UIViewController *lastViewController = [[navigationController viewControllers] lastObject];
        return [self topViewController:lastViewController];
    }

    UIViewController *presentedViewController = (UIViewController *)rootViewController.presentedViewController;
    return [self topViewController:presentedViewController];
}

你可以用rootViewController调用这个方法是window的rootViewController

You can call this method with rootViewController is window's rootViewController

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