应用程序将进入后台 - >转到根视图菜单 [英] Application will enter background -> go to root view menu

问题描述

我正在开发一个具有大约8个视图并使用导航控制器进行导航的应用程序。第一个视图是主菜单。

I am developing an application which has about 8 views and use navigation controller to navigate through. The first view is a main menu.

如果用户按下主页按钮（应用确实输入背景），我想要（每个视图）弹出到主视图。

What i want is (of each view) to pop to the main view if the user press the home button (App did enter background).

我知道AppDelegate方法 applicationDidEnterBackground 和 applicationWillEnterForeground 。

I know the AppDelegate methods applicationDidEnterBackground and applicationWillEnterForeground.

我知道从导航控制器调用的方法 popToRootViewControllerAnimated 。

And i know the method popToRootViewControllerAnimated called from the navigation controller.

我试过在applicationDidEnterBackground中使用popToRootViewControllerAnimated。
喜欢：

I have tried to use popToRootViewControllerAnimated in applicationDidEnterBackground. Like:

[self.window.rootViewController.navigationController popToRootViewControllerAnimated:YES];

但这不起作用。

能告诉我这项工作的最佳选择吗？

Can you please let me know what is the best option for this job?

推荐答案

我想你会尝试 NSNotificationCenter 这样：

applicationDidEnterBackground 和 applicationWillEnterForeground 把这个

[[NSNotificationCenter defaultCenter] postNotificationName:@"popToRoot" object:nil];

和你的 rootViewController的 viewDidLoad （总是出现在应用启动时）添加：

and in your rootViewController's viewDidLoad (that always appears on app launch) add this:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(popToRootViewControllerAnimated) name:@"popToRoot" object:nil];

然后在 rootViewController 中创建一个方法：

Then create a method in your rootViewController:

- (void)popToRootViewControllerAnimated
{
    [self.navigationController popToRootViewControllerAnimated:YES];
}

每当应用程序首次启动时， NSNotificationCenter 将初始化名称 popToRoot 并为此准备一个方法 popToRootViewControllerAnimated 。

Whenever the application will start first time, NSNotificationCenter will initialize for name popToRoot and prepare a method popToRootViewControllerAnimated for this.

当应用程序转到后台时， NSNotificationCenter 将通过按摩 @popToRoot到 rootViewController的popToRootViewControllerAnimated 方法和 viewcontroller 将弹出到 rootview

And when application will go to background, NSNotificationCenter will pass a massage @"popToRoot" to rootViewController's popToRootViewControllerAnimated method and viewcontroller will pop to rootview

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