Setting the default tab when using storyboards

问题:

Can anyone please tell me how to set the default tab when using storyboards in iOS. I can't seem to figure out how to accomplish this.

Thank you

回答1:

You can use one of these two methods:

tabBar.items = tabBarItems;
tabBar.selectedItem = [tabBarItems objectAtIndex:0];

or a direct method from the object

[tabBar setSelectedItem:myUITabBarItem];

or you can combine them to do this:

tabBar.items = tabBarItems;
[tabBar setSelectedItem:[tabBarItems objectAtIndex:0]];

but i havent tested that method yet, hope this helps!

回答2:

Whilst you can set the initial selected tab programmatically like the other answers, to achieve the same in your storyboard without touching code you would perform the following:

1. Select the Tab Bar Controller in the Storyboard Interface
2. Show the Identity Inspector in the Utilities panel
3. Add a new "User Defined Runtime Attribute"
4. Set the Key Path to "selectedIndex"
5. Set the Type to "Number"
6. Set the Value to the index of the tab you wish to select (a value of 1 would select the second tab for example)
7. Save the Storyboard, build and run the application

This should be what it looks like when you've achieved the above steps:

回答3:

Might seem like overkill for some to subclass UITabBarController, but, I think it provides the cleanest solution.

1. Create BaseTabBarController.swift

2. Add an @IBInspectable and set it in viewDidLoad:

   class BaseTabBarController: UITabBarController {
   
       @IBInspectable var defaultIndex: Int = 0
   
       override func viewDidLoad() {
           super.viewDidLoad()
           selectedIndex = defaultIndex
       }
   
   }
   

3. In the storyboard, set you UITabBarController to be your new subclass:

4. Go to the Attributes Inspector add set the new property Default Index:

5. ta-da! (:

回答4:

1. Create a new file subclass of UITabBarController;

2. Add this at the end of viewDidLoad:

   self.selectedIndex = 1;

3. Set this new file as the Custom Class in the UITabBarController of your Storyboard.

You're done.

回答5:

The following code worked for me:

UITabBarController *tabBarController = (UITabBarController *)self.window.rootViewController;
tabBarController.selectedIndex = 2;

回答6:

In the viewDidLoad() of the TabBarController, set selectedIndex to whatever you want. (0 would be the first, 3 would be the fourth, etc.)

回答7:

in appdelegate find applicationDidBecomeActive function and add this lines

let tabBarController = self.window?.rootViewController as! UITabBarController
tabBarController.selectedIndex = 0 // any index you want

回答8:

You can achieve this through Xcode 8 or later (just tested it and don't know if it's available before this version)

Do the steps as @Joshua Finch said but:

1. Select the bar item instead of the TabBar
2. Got to "User Defined Runtime Attribute"
3. Add new key
4. Name it "selected"
5. Set its type to boolean and choose true / or check the checkbox

回答9:

My variant is suitable when you want just change the default selected controller, no more customizing. Just add the follow category:

//  UITabBarController+DefaultPage.h
#import <UIKit/UIKit.h>

@interface UITabBarController(DefaultPage)

@end


//  UITabBarController+DefaultPage.m
#import "UITabBarController+DefaultPage.h"

@implementation UITabBarController(DefaultPage)

- (void)viewDidLoad {
    [super viewDidLoad];

    self.selectedIndex = 1;
}

@end

p.s: I prefer @joshua-finch answer

回答10:

Building upon Aviel Gross' answer, I just wanted to implement this for a UITabBar, as opposed to a UITabBarController. This can be done as follows:

class BaseTabBar: UITabBar {

    @IBInspectable var defaultIndex: Int = 0 {
        didSet {
            self.selectedItem = self.items?[defaultIndex]
        }
    }
}