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Learn how to update a `UITableView` row label in Swift using the delegation pattern for seamless data transfer between view controllers.
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How to Update a UITableView Row Label in Swift

If you've worked with UITableView in iOS development using Swift, you might have found yourself facing a common challenge: how to update a row's label in your table view when a selection is made from another table view. This task is essential for creating a dynamic and interactive user experience. In this guide, we'll break down the solution to this problem using the delegation design pattern.

Understanding the Problem

Let's set the context with a common scenario. Imagine you have two screens managed by UIViewController classes:

FirstViewController - Displays a list where each row contains a button. When the button is pressed, it navigates to the second view.

CountryViewController - Shows a list of countries. When a country is selected, you want to reflect this choice back in the FirstViewController by updating the label of the selected row.

If you've encountered this problem, you know it can feel complicated—especially if you're new to iOS development or Swift. But fear not! The delegation pattern offers a neat solution.

The Solution

Step 1: Define the Protocol

First, you need to create a protocol that will handle the updating of the country name. This protocol acts as a bridge between the two view controllers. Here's how to define it:

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Step 2: Conform to the Protocol in FirstViewController

Now, you will make FirstViewController conform to the SelectCountry protocol. This requires implementing the method defined in the protocol:

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Step 3: Create a Delegate Variable in CountryViewController

In the CountryViewController, you need to create a variable that holds a reference to the delegate. This allows you to call the method on the delegate when a country is selected:

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Step 4: Set the Delegate Before Pushing CountryViewController

In your button click method from FirstViewController, set the delegate before navigating to CountryViewController:

[[See Video to Reveal this Text or Code Snippet]]

Step 5: Use the Delegate in didSelectRowAt Method

Finally, in the CountryViewController, update the didSelectRowAt method to call the delegate’s method when a country is selected:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By implementing these steps, you ensure that when a user selects a country from CountryViewController, that selection is returned to FirstViewController, where the corresponding row label can be updated accordingly. The delegation pattern not only streamlines this process but also adheres to good coding practices by keeping your view controllers decoupled.

This approach is widely used in iOS development and is useful in various contexts beyond just updating labels. It promotes reusability and maintainability in your code.

With this guide, you should now feel more empowered to tackle similar challenges in your iOS projects. Happy coding!