UITabBarController setting selected index on launch causing issues

Hello,

Can't you just use the selectedIndex property instead? I've not tried it myself (so I might be completely wrong), but it seems like it would be a better way of doing it as opposed to calling the selector yourself.

Regards,

John

Falling You - exploring the beauty of voice and sound
http://www.fallingyou.com

The call to:

[window addSubview:tabBarController.view]

is the first time the view is actually created. So trying to set any state before that will be bad.

What I do is instantiate the view controller, pass it state information (which just holds onto the data), and then add the view as normal.

The trick here is that the view controller doesn't make use of the state information until the its 'viewDidLoad' method. It is here that it is safe to set previous state. This works whether you use IB or whether you are progmatically creating all of your controls (in 'viewDidLoad').

The reason your approach works on the simulator but not the device is most likely because the simulator is so much faster. By the time your 2nd approach (setting state after adding the subview) is run, the view has already been loaded. But on a device, it hasn't fully loaded yet so it crashes.

Maybe i'm not understanding something the problem. The app i'm working on has a tab bar controller, so it was pretty easy for me to select which tab view is shown initially like this:

- (void)applicationDidFinishLaunching:(UIApplication *)application {           self.playNetwork = [[NSUserDefaults standardUserDefaults] stringForKey:@"network_mode_preference"];      self.user = [[NSUserDefaults standardUserDefaults] stringForKey:@"user"];            // Create the navigation and view controllers            [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackOpaque];        MZAppDelegate *appDelegate = (MZAppDelegate *)[[UIApplication sharedApplication] delegate];     appDelegate.channelList = [NSMutableArray array];     appDelegate.contentList = [NSMutableArray array];      appDelegate.messagesList = [NSMutableArray array];            UITabBarController *aTabBarController = [[UITabBarController alloc] init];      firstViewController = [[FirstViewController alloc] init];      secondViewController = [[SecondViewController alloc] init];      thirdViewController = [[ThirdViewController alloc] init];      fourthViewController = [[FourthViewController alloc] init];      fifthViewController = [[FifthViewController alloc] init];      aTabBarController.delegate = self;            self.tabBarController = aTabBarController;            NSArray *tabViewControllers = [[NSArray alloc] initWithObjects:firstViewController,                                                                                    secondViewController,                                                                                    thirdViewController,                                                                                    fourthViewController,                                                                                    fifthViewController,                                                                                    nil];            [tabBarController setViewControllers: tabViewControllers animated:YES];      tabBarController.selectedIndex = 4;            [tabBarController release];      [tabViewControllers release];            [firstViewController release];      [secondViewController release];      [thirdViewController release];      [fourthViewController release];      [fifthViewController release];            // Configure and show the window           [window addSubview:[tabBarController view]]; }  

... is this not what you're also trying to do?

Regards,

John

Falling You - exploring the beauty of voice and sound
http://www.fallingyou.com

You say you are creating your view controllers as a nib. It's the associated view controller for the nib that you need to add the 'viewDidLoad' to.

Yay! I'm glad I could help 🙂

Regards,

John, doin' the Snoopy dance 🙂

Falling You - exploring the beauty of voice and sound
http://www.fallingyou.com

Hello Uprise,

If you're still watching this topic, what about :

- (void)viewDidLoad 
{
 yourAppNameAppDelegate *appDelegate = (yourAppNameAppDelegate *)[[UIApplication sharedApplication] delegate]; 
 appDelegate.tabBarController.selectedIndex = userSettingsObject.tabBarLastSelectedIndex;
}

works great for me, and seems a little simpler...

regards

don't know if it helped the orginal poster but helped me greatly. I was trying to change the view from another class and couldn't get it too work. After examining why your code works, i have greater understanding. Thanks!