ios - Data transfer between child tabs in a Tab bar controller -

my tab bar controller has 4 tabs, have 6 textfields in vc1 , want use data entered display labels in vc2, vc3 & vc4. have read adding data tabbarcontroller subclass , using in rest of vc's stuck on implementation. i'm absolute beginner , code or links implementation of code great.

try this:

i have created uitabbarcontroller 2 child controllers tab1viewcontroller , tab2viewcontroller.

screenshot of storyboard:

code:

class tab1viewcontroller: uiviewcontroller {     @iboutlet weak var testtextfield: uitextfield!     override func viewdidload()     {         super.viewdidload()     } }  class tab2viewcontroller: uiviewcontroller {     @iboutlet weak var testlabel: uilabel!     override func viewdidload()     {         super.viewdidload()     }      override func viewwillappear(_ animated: bool)     {         super.viewwillappear(animated)         let tab1controller = self.tabbarcontroller?.viewcontrollers?.first as! tab1viewcontroller         self.testlabel.text = tab1controller.testtextfield.text     } } 

similarly can create 4 tabs , other textfields.

for more refer : how pass data tab bar controller 1 of tabs?