Switching to a TabBar tab view programmatically

Question

Let s say I have a UIButton in one tab view in my iPhone app  and I want to have it open a different tab in the tab bar of the TabBarController   How would I write the code to do this     I m assuming I unload the existing view and load a specific tab view  but I m not sure how to write the code exactly

User · Answer

For cases where you may be moving the tabs  here is some code   for   UINavigationController  controller in self tabBarController viewControllers                 if     controller childViewControllers objectAtIndex 0  isKindOfClass  MyViewController class                       self tabBarController setSelectedViewController controller                   break

User · Answer

My issue is a little different  I need to switch from one childViewController in 1st tabBar to home viewController of 2nd tabBar  I simply use the solution provided in the upstairs   tabBarController selectedIndex   2   However when it switched to the home page of 2nd tabBar  the content is invisible  And when I debug  viewDidAppear  viewWillAppear  viewDidLoad  none of them is called  My solutions is to add the following code in the UITabBarController   override var shouldAutomaticallyForwardAppearanceMethods  Bool        return true

User · Answer

You can simply just set the selectedIndex property on the UITabBarController to the appropriate index and the view will be changed just like the user tapped the tab button

User · Answer

I tried what Disco S2 suggested  it was close but this is what ended up working for me   This was called after completing an action inside another tab   for  UINavigationController  controller in self tabBarController viewControllers        if   controller isKindOfClass  MyViewController class                   self tabBarController setSelectedViewController controller           break

User · Answer

Like Stuart Clark s solution but for Swift 3 and using restoration identifier to find correct tab   private func setTabById id  String      var i  Int   0   if let controllers   self tabBarController  viewControllers       for controller in controllers         if let nav   controller as  UINavigationController  nav topViewController  restorationIdentifier    id           break               i   i 1             self tabBarController  selectedIndex   i     Use it like this   Humans  and  Robots  must also be set in storyboard for specific viewController and it s Restoration ID  or use Storyboard ID and check  use storyboard ID  as restoration ID    struct Tabs       static let Humans    Humans      static let Robots    Robots    setTabById id  Tabs Robots    Please note that my tabController links to viewControllers behind navigationControllers  Without navigationControllers it would look like this   if controller restorationIdentifier    id

User · Answer

import UIKit  class TabbarViewController  UITabBarController UITabBarControllerDelegate      MARK - View Life Cycle  override func viewDidLoad         super viewDidLoad       override func didReceiveMemoryWarning         super didReceiveMemoryWarning         Tabbar delegate method override func tabBar   tabBar  UITabBar  didSelect item  UITabBarItem        let yourView   self viewControllers  self selectedIndex  as  UINavigationController     yourView popToRootViewController animated false

User · Answer

I wanted to be able to specify which tab was shown by class rather than index as I thought it made for a robust solution that was less dependant on how you wire up IB  I didn t find either Disco s or Joped s solutions to work so i created this method   - void setTab  Class class      int i   0      for  UINavigationController  controller in self tabBarContontroller viewControllers           if   controller isKindOfClass class                break                    i              self tabBarContontroller selectedIndex   i      you call it like this    self setTab  YourClass class      Hope this is helpful to someone

User · Answer

Try this code in Swift or Objective-C  Swift  self tabBarController selectedIndex   1   Objective-C    self tabBarController setSelectedIndex 1

User · Answer

Note that the tabs are indexed starting from 0  So the following code snippet works  tabBarController     UITabBarController alloc  init         tabBarController selectedViewController    tabBarController viewControllers objectAtIndex 4     goes to the fifth tab in the bar

User · Answer

Like Stuart Clark s solution but for Swift 3   func setTab lt T gt    myClass  T Type        var i  Int   0     if let controllers   self tabBarController  viewControllers           for controller in controllers               if let nav   controller as  UINavigationController  nav topViewController is T                   break                           i   i 1                     self tabBarController  selectedIndex   i     Use it like this   setTab MyViewController self    Please note that my tabController links to viewControllers behind navigationControllers  Without navigationControllers it would look like this   if let controller is T

User · Answer

Use in AppDelegate m file    void tabBarController  UITabBarController   tabBarController  didSelectViewController  UIViewController   viewController         NSLog   Selected index   d   tabBarController selectedIndex        if  viewController    tabBarController moreNavigationController                tabBarController moreNavigationController delegate   self             NSUInteger selectedIndex   tabBarController selectedIndex       switch  selectedIndex             case 0              NSLog   click me  u  self tabBarController selectedIndex               break          case 1              NSLog   click me again    u  self tabBarController selectedIndex               break           default              break

User · Answer

My opinion is that selectedIndex or using objectAtIndex is not necessarily the best way to switch the tab  If you reorder your tabs  a hard coded index selection might mess with your former app behavior   If you have the object reference of the view controller you want to switch to  you can do   tabBarController selectedViewController   myViewController   Of course you must make sure  that myViewController really is in the list of tabBarController viewControllers

[iphone] Switching to a TabBar tab view programmatically?

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