CODEWITHSUNDEEP
iphoneiosobjective-c
q0re
q0re

Reputation: 1359

Application will enter background -> go to root view menu

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

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

I know the AppDelegate methods applicationDidEnterBackground and applicationWillEnterForeground.

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

I have tried to use popToRootViewControllerAnimated in applicationDidEnterBackground. Like:

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

But this does not work.

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

Upvotes: 5

Views: 8729

Answers (4)

Thomas Keuleers
Thomas Keuleers

Reputation: 6115

First: you should check wether the rootviewcontroller is a navigationController. Because self.window.rootViewController.navigationController is often nil. Why? Because the navigationController of a navigationController is 'nil'. Mostly, I set my rootViewController to be a navigationController

Secondly: You shouldn't do animated stuff when your application is about to quit. You should do it not-animated

popToRootViewControllerAnimated:NO

Upvotes: 0

Vaibhav Saran
Vaibhav Saran

Reputation: 12908

i think you try NSNotificationCenter like this:

inside applicationDidEnterBackground and applicationWillEnterForeground put this

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

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];

Then create a method in your rootViewController:

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

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

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

Upvotes: 10

D-eptdeveloper
D-eptdeveloper

Reputation: 2430

have you tries it like this :-

[self.navigationController popToRootViewControllerAnimated:YES];

replace your navigationController name with navigationController here.

Edit:-

in AppDelegate.h file

@interface AppDelegate : UIResponder <UIApplicationDelegate>
{
    UINavigationController *navMain;
}

@property (nonatomic, retain) UINavigationController *navMain;

in AppDelegate.m file

@synthesize navMain;

-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.
    self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];
    self.navMain = [[UINavigationController alloc] initWithRootViewController:self.viewController];
    self.window.rootViewController = self.navMain;
    [self.window makeKeyAndVisible];
    return YES;
}

-(void)applicationDidEnterBackground:(UIApplication *)application
{
    NSLog(@"applicationDidEnterBackground");
    [self.navMain popToRootViewControllerAnimated:YES];
}

try edited anwser

Upvotes: 2

MobileDev
MobileDev

Reputation: 1024

crate a propery for UINavigationController in your AppDelegate class. In applicationDidEnterBackground: method call the popToRootViewController method by using the UINavigationController Property. For Suppose your propery name is navigationController then 

[self.navigationController popToRootViewControllerAnimated:YES];

Upvotes: 0

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