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iOS Programming Recipe 5: Passing Values Between Segues with PrepareForSegue

In Part 1 and 2 of Recipe 3 I stepped through creating a modal relationship using storyboards. There was no code needed to make this relationship using storyboards. If you want to pass information from the presenting view to the presented view you’ll need to add some code.

Assumptions

  • You know how to set up a segue relationship using the storyboard. If not go read part 1 and 2 of Recipe 3 here: Part 1Part 2

Setting Up the Views

To start off, I created a new single view controller project and replaced the view controller with a navigation view controller. Then I deleted the root controller and added two new view controllers. I made one view controller the root view controller, and I didn’t setup the segue on the other controller for now. Then I gave each views the titles “Root View Controller” and “First View Controller” respectively. See recipe 3 for more details on setting this up.

Next I deleted the viewController class and all of it’s refferences. Delete the viewController.m file and viewController.h file and Xcode will ask you if you would like to remove the refferences.

Next we’ll need to create two new UIViewController Classes. To do this push the plus sign in the bottom left hand corner of the project navigator.

Create New UIViewController Classes

When prompted choose objective-C class under Cocoa Touch and press next. For the next prompt name the Class “RootViewController” and choose the subclass “UIViewController” then press next. You will then press create on the next prompt. Repeat this step and name the next class “FirstViewController”.

Choosing UIViewController subclass

When you’re done creating classes you should see the newly created .m and .h files in the project navigator.

New Project Navigator

 

The last thing we’ll want to do is connect our new classes to our views on the storyboard. To do this, select the view and in the utilities pane under the identity inspector choose the class from the dropdown.  Do this for both the RootViewController and the FirstViewController.

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