在一个标签栏控制器中从一个ViewController切换到另一个ViewController？

Question

In the interface builder I have a UITabBarController and it is set as the initial view controller. From the tab bar controller, I have linked three independent ViewControllers; two UIViewController 's and one UITableViewController . I have embedded all three of these views inside UINavigationController 's as each of these views will eventually segue to a new view.

Interface Builder

Problem:

I now want to link one of the UIViewController 's to the UITableViewController using a button to segue to the table view. This way I can pass information, ie func prepareForSegue() , to the table view. I want to maintain the tab bar controller at the bottom, however I do not want to have the ability to go back to the previous UIViewController from the current UITableViewController via a UIBarButtonItem at the the top of the view; That is what the tab bar at the bottom is for.

However every time I segue "Show" the table view (it is actually a segue to the table views navigation controller), the navigation bars at the top and the bottom of the table view disappear. Is there anyway to prevent this from happening?

I have also tried segue "Show" directly to the table view, in which case the tab bar is visible, but then it displays a "back" button at the top of the view to segue back to the sending UIViewController . I am hesitant about accepting a solution that would just hide the back button, because I feel I will run into problems down the road when I want to navigate to a detail view from the table view itself, since I would be bypassing the UITableViewController 's UINavigationController .

Any solutions would be greatly appreciated. I have been trying to solve this problem for hours and I'm about to put my head through my computer screen. Also I thought about just using tabBarController?.selectedIndex on the button click to shift to the table view, and then passing the information using NSUserDefaults , but this is out of the question since I would be passing a custom object, and would have to encode and decode every custom field.

Answer 1

I you use a segue to get to it, as you say, you will still be using the UIViewController 's UINavigationController which seems a bit messy. So I actually think selectedIndex is probably the best way to go as once you change to the UITableViewController you'll be in the correct navigation stack.

Instead of using NSUserDefaults , why not just reference the UITableView itself from the UIViewController , set the values you want, and then swap to it using self.tabBarController.selectedIndex .

So for your scenario above it, assuming the UITableViewContollrer is the third view in the UITabBarController , you would do something like the following:

1. Pass whatever you want into the UITabBarController by setting some pre-defined var in it. For example, if there was a String called saveMe in the UITableViewController , then do the following in the UIViewController :

    let navController = self.tabBarController?.viewControllers![2] as! UINavigationController let tableViewController = navController.viewControllers.first as! JarListTableViewController tableViewController.saveMe = "Saved string here" 

2. Swap to the UITableViewController using:

    self.tabBarController?.selectedIndex = 2 

The only issue with this is using selectedIndex won't perform a transition animation but not sure if you need this. This link could help if you do.