How to Segue with Data from One Tab to Another Tab Properly

passing data from one tab controller to another in swift

you can use this code : Objective C

[tab setSelectedIndex:2];

save your array in NSUserDefaults like this:

[[NSUserDefaults standardUserDefaults]setObject:yourArray forKey:@"YourKey"];

and get data from another view using NSUserDefaults like this :

NSMutableArray *array=[[NSUserDefaults standardUserDefaults]objectForKey:@"YourKey"];

swift

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
      if segue.identifier == "toTabController" {
        var tabBarC : UITabBarController = segue.destinationViewController as UITabBarController
        var desView: CaseViewController = tabBarC.viewControllers?.first as CaseViewController

        var caseIndex = overviewTableView!.indexPathForSelectedRow()!.row
        var selectedCase = self.cases[caseIndex]

        desView.caseitem = selectedCase
      }
    }

How to pass data between different tabs in a tab bar controller

Have a look at this question: iPhone: How to Pass Data Between Several Viewcontrollers in a Tabbar App

Also the imho cleanest way is to use the NSNotificationcenter. It's simple: How to use NSNotificationcenter

Segue from modal view to tab bar view controller and not lose tab bar

Here is my example of how to do this. In my setup, I choose the yellow ViewController from the tab, then press Go! which modally presents the white ViewController. Pressing Exit returns to the green ViewController.

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To set this up, use an unwind segue to return to the viewController that called you. For instance, implement this in the first ViewController of the tab (the one calling the modal segue).

@IBAction func backFromModal(_ segue: UIStoryboardSegue) {
    print("and we are back")
    // Switch to the second tab (tabs are numbered 0, 1, 2)
    self.tabBarController?.selectedIndex = 1
}

Then switch to another tab using self.tabBarController?.selectedIndex = n where n is the number of the tab you really want to go to. To set up the unwind segue, you can either control-drag from a button in your modal view controller to the exit icon at the top of the viewController and select backFromModal from the pop up...

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OR

you can set up the unwind segue to be called programmatically by control-dragging from the viewController icon at the top of the modal viewController to the exit icon, and select backFromModal from the pop up.

Then, go to the Document Outline View and click on the unwind segue

and give it an identifier in the Attributes Inspector on the right (for example "returnFromModal").

Then you'd call the unwind segue like this:

self.performSegue(withIdentifier: "returnFromModal", sender: self)

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