iOS-标签栏UIView

Question

I'm developing an app with tab bar, having three different tabs. On the second tab I want to hide some controls (textfields & labels) when each tab lost its focus ie when user goes to another tab.
Is there any specific method to do so.
By the way, I know the code for hiding controls.

[anylbl setHidden:YES];

I just want to know methods for view lost focus.

Answer 1

For firing events when closing the view you can use:

-(void) viewWillDisappear:(BOOL)animated 
{
    [super viewWillDisappear:animated];
    _yourLabel.hidden = YES;
    _yourImageView.hidden = YES;
}

You can also use:

-(void) viewDidDisappear:(BOOL)animated 
{
    [super viewDidDisappear:animated];
    _yourLabel.hidden = YES;
    _yourImageView.hidden = YES;
}

Answer 2

If you want to respond to the UITabBarControllerDelegate , then you have these methods.

- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController NS_AVAILABLE_IOS(3_0);

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

This way you can control this on a controller level rather than a viewAppearance level.