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iOS Build a Self-Destructing Message iPhone App Designing and Starting the App A Storyboard with a Tab Bar Controller

Stuck on creating tab bar programmatically

Challenge text:

We just saw how to change tabs by tapping on them, but we can also do this programmatically using the selectedIndex property of UITabBarController. The tab bar controller in the example below has three tabs. Use dot-notation or the setSelectedIndex: method to set the 3rd tab as the selected tab. Note: The tabs are indexed just like arrays, meaning the 1st tab is at index 0.

and code:

<p>

import "MainViewController.h"

import "UITabBarItem.h"

@implementation MainViewController

  • (void)viewDidLoad { [super viewDidLoad];

    NSArray *tabBarItems = self.tabBarController.tabBar.items;

    // Add your code below! The property for MainViewController's // tab bar controller is named 'tabBarController'.

}

@end </p>

And I have tried:

<p> [tabBar setSelectedItem:[tabBar.items objectAtIndex:2]]; </p>

Please help!

2 Answers

Stone Preston
Stone Preston
42,016 Points

you are using the wrong method. you need to use the setSelectedIndex method of the tabBar controller not setSelectedItem. you also need to call the method on the tabBarController property, not the tabBar itself

- (void)viewDidLoad {
    [super viewDidLoad];

    NSArray *tabBarItems = self.tabBarController.tabBar.items;

    // Add your code below! The property for MainViewController's 
    // tab bar controller is named 'tabBarController'.

    //the challenge asks you  to use setSelectedIndex
    [self.tabBarController setSelectedIndex:2];

}

Thank you very much!