iOS How do I recognize if the tab is changed?

[ArtOfWarfare]

OK, I want my game to pause if the player selects one of the other tabs.

Here's the code I tried...

first off, I made outlets for all the tabs and the tab bar those have all been connected in Interface Builder.

	IBOutlet	UITabBar		*tabBar;
	IBOutlet	UITabBarItem		*optionsTab;
	IBOutlet	UITabBarItem		*numbersTab;
	IBOutlet	UITabBarItem		*scoresTab;
	IBOutlet	UITabBarItem		*instructionsTab;

I've got this to set my controller object as the delegate of all the tabs:

- (void) awakeFromNib
{
	tabBar.delegate = self;
	optionsTab.delegate = self;
	numbersTab.delegate = self;
	scoresTab.delegate = self;
	instructionsTab.delegate = self;
}

There's an error for each one of the tab items...

error: request for member 'delegate' in something not a structure or union

I have tried commenting them out, and the compiler will run without errors, but it still doesn't work.

I also have:

@interface Controller : NSObject <UITextFieldDelegate, [b]UITabBarDelegate[/b]>

In my header so that I wouldn't get the compiler error that I was missing the protocols.

And finally I have this:

- (void) tabBar: tabBar didSelectItem: tabItem
{
	NSLog(@"Recognises that a tab item was selected.");
	[self pauseGame];
}

I get the following warning here:

warning: conflicting types for '-(void)tabBar: (id)tabBar didSelectItem: (id)tabItem'

The NSLog message isn't ever posted meaning something prior to the code for pauseGame isn't working.

 

[admanimal]

UITabBarItems do not have delegates. Look at the documentation for UITabBar and UITabBarDelegate. Your delegate method is not defined correctly.

 

[ArtOfWarfare]

...

OK...

I got rid of the outlets and the messages to set the delegates of the tab items (but not the tab bar.)

I changed other bit to:

- (void) tabBar: (UITabBar *) tabBar didSelectItem: (UITabBarItem *) item
{
	NSLog(@"Recognizes that a tab item was selected.");
	[self pauseGame];
}

which got rid of the warning message.

But it still doesn't work. The NSLog message is never sent.

I also tried:

- (void) tabBar: (UITabBar *) tabBar didSelectItem: (UITabBarItem *) optionsTab
{
	NSLog(@"Recognizes that a tab item was selected.");
	[self pauseGame];
}

with the optionsTab outlet set up again, but it still didn't work.

Edit: OK, I found out what I actually needed was the TabBarControllerDelegate's

- (void) tabBarController: (UITabBarController *) tabBarController didSelectViewController: (UIViewController *) viewController

method.

Now it all works properly.