swift share data between view controllers

Because of this we need to detect which segue was called and then do something. Next, we need to add the method to ViewControllerA that is called when any segue is performed. 1) Create protocol in ChildViewController 2) Create delegate variable in ChildViewController 3) Extend ChildViewController protocol in ParentViewController 4. In this example we'll call it 'showDetailSegue' In ViewControllerA you need to tell it about ViewControllerB, so use an #import 'ViewControllerB.h'Ĭreate the segue from ViewControllerA to ViewControllerB on the storyboard and give it an identifier. So to pass a BOOL from ViewControllerA to ViewControllerB we would do the following: This is similar to the above but instead of passing the data before you push the view controller, you use a method called -(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender

If you are using Storyboards you are most likely using segues and will need this procedure to pass data forward. This will set isSomethingEnabled in ViewControllerB to BOOL value YES. ViewControllerB.isSomethingEnabled = YES ViewControllerB *viewControllerB = bundle:nil] Then where you want to load the view, for example, didSelectRowAtIndex or some IBAction, you need to set the property in ViewControllerB before you push it onto the navigation stack. In ViewControllerA you need to tell it about ViewControllerB so use an #import 'ViewControllerB.h' In ViewControllerB.h create a property for the BOOL (nonatomic, assign) BOOL isSomethingEnabled To pass a BOOL value from ViewControllerA to ViewControllerB we would do the following. You would use this method if you wanted to pass an object/value from one view controller to another view controller that you may be pushing on to a navigation stack.įor this example, we will have ViewControllerA and ViewControllerB

Passing data forward to a view controller from another view controller. This question seems to be very popular here on Stack Overflow so I thought I would try and give a better answer to help out people starting in the world of iOS like me.

Swift share data between view controllers