Скачать или смотреть How to Track TableView Cell's TextField Text from a ViewController in iOS

A step-by-step guide on how to observe changes in a TableView cell's TextField from a ViewController in iOS, utilizing the delegation pattern efficiently.
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This video is based on the question https://stackoverflow.com/q/63648215/ asked by the user 'Kaan Vural' ( https://stackoverflow.com/u/13003829/ ) and on the answer https://stackoverflow.com/a/63648784/ provided by the user 'DonMag' ( https://stackoverflow.com/u/6257435/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

Tracking changes in a UITextField located in a UITableViewCell from a corresponding ViewController can initially seem daunting, especially if you're new to iOS development. The delegation pattern is a commonly used design pattern in iOS that allows one object to communicate with another, enabling the ViewController to respond to changes in the cell's text field.

In this guide, we will break down how to observe changes in a UITableViewCell's UITextField. We'll demonstrate how to properly set up the delegate pattern, ensuring that your ViewController receives the updates when the text changes in the text field. Let's dive in!



Understanding the Protocol and Delegate Pattern

What is a Delegate?

A delegate is an object that acts on behalf of another object, serving as a middle-man of sorts for handling events or actions. In our case, the UITableViewCell will act as the delegate for the UITextField, and the ViewController will conform to the delegate protocol.

Steps to Implement the Delegate Pattern

1. Define the Protocol

First, you must define a protocol that declares the methods the delegate should implement. The protocol typically includes any actions or data that the cell wants to notify the delegate about.

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2. Create Delegate Property in the Cell Class

Next, update your cell class to include a property to hold the delegate. This property will reference the ViewController which will implement the delegate methods.

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3. Notify Delegate on Text Change

Now, you need to connect the text field in the cell to the delegate method. Create an action method that gets triggered when the text field's value changes.

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Connecting the ViewController and the Cell

ViewController Conformance

Your ViewController should conform to the RouteChangesInfoTableViewCellDelegate protocol. Make sure to implement the required method to receive notifications from the cell.

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Setting Up the Table View

When configuring the table view, it's essential to set the delegate of the cell to the ViewController. This allows the ViewController to listen for changes in the cell's text field.

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Handling Text Changes

Finally, implement the delegate method in the ViewController to handle the text updates. This is where you can log or process the text that has been inputted.

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Conclusion

In this post, we have dissected how to effectively track changes to a text field within a UITableViewCell from your ViewController using the delegation pattern. This approach not only keeps your code organized but also adheres to the principles of good design in iOS development.

By following the steps outlined, you'll be able to seamlessly observe and respond to changes in your table view cell's text field, paving the way for a more interactive and dynamic user experience.

If you have any questions or need further assistance, don't hesitate to reach out!