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Learn how to make your Base class property generic in Swift, allowing for reusable UITableViewCells with any model type through protocol-oriented programming.
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This video is based on the question https://stackoverflow.com/q/64005729/ asked by the user 'Avijit Nagare' ( https://stackoverflow.com/u/4767429/ ) and on the answer https://stackoverflow.com/a/64006288/ provided by the user 'Dávid Pásztor' ( https://stackoverflow.com/u/4667835/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Generic Base Class Property in Swift: Transform Your Custom Cells with Protocols

Creating reusable custom cells in a UITableView can be a bit challenging, especially when you want to support multiple model types without rewriting much code. If you find yourself duplicating code for every new model, it's time to look into making your base class property generic. In this guide, we'll explore how to make the property "cellViewModel" generic in a Swift class, allowing for reusable UITableViewCells that can adapt to different model types with ease.

The Challenge: Making Custom Cells Flexible

You may have encountered a situation where you are trying to use the same custom cell for different data models. In the example provided, we have a BaseCustomCell class set up to display a view model of type CELLVIEWMODEL. However, every time you create a new model (like CELLVIEWMODEL1 or CELLVIEWMODEL2), you end up needing to create a new class or duplicate functionality.

Here’s a brief outline of the current problem:

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In this code, the cellViewModel is tightly coupled to a specific type, which limits flexibility and reusability.

The Solution: Using Protocols

To solve this problem effectively, we can utilize protocol-oriented programming. Instead of tying cellViewModel to one specific struct, we can define a protocol that corresponds to the properties required by the model.

Step 1: Define the Protocol

We start off by defining a protocol named CellViewModel. This protocol will declare the properties that any view model must have:

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Step 2: Update the Base Class

Next, we modify the BaseCustomCell class to accept any type that conforms to the CellViewModel protocol. Here’s how that looks:

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Step 3: Create Specific View Models

Now, you can create specific view models that conform to your protocol. Here’s an example:

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Step 4: Set Values in Subclasses

With the BaseCustomCell set up, you can now create subclasses that override the setValuesInSubClasses method to configure the cell based on the specific view model:

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Step 5: Use the Updated Setup

Finally, ensure that when you are dequeuing your cells in the table view, you utilize the new structure correctly:

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Conclusion

By using protocols, you can create a flexible and reusable BaseCustomCell that can handle various model types with ease. This approach not only cleans up your code, but it also provides a consistent interface for any new models you may want to implement in the future.

Key Takeaways:

Protocol-Oriented Programming allows for cleaner and more adaptable code.

Defining a protocol for your cell view models lets you create various models without duplicating the base cell functionality.

Reusability is crucial in maintaining a clean codebase and reducing redundancy.

With these strategies, you can ensure that your UITableView remains both efficient and easy to maintain. Happy coding!