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Discover how to limit the number of rows displayed in a `UITableView` and dynamically extend that limit as users scroll. Enhance your iOS app's performance without using an activity loader.
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Mastering UITableView: How to Limit and Extend Rows Dynamically in Swift

When building an iOS app that involves displaying lists of data, performance and user experience are crucial. One common challenge developers face is managing the number of rows displayed in a UITableView. In this guide, we will explore a solution for limiting the number of rows shown initially and extending this limit as the user scrolls down—without any loading indicators. Let’s dive into the problem and its solution step-by-step.

Understanding the Problem

Imagine you have a table view that can display a lot of data, say hundreds or thousands of items. Loading all of these at once can be overwhelming, both for the user and the performance of the app. The goal here is twofold:

Limit the initial display to a manageable number of rows (for example, 100).

Dynamically extend this limit as the user scrolls towards the bottom of the table view, seamlessly loading more data without needing visual loaders or interruptions.

The Solution

To achieve this, we'll modify the UITableView data source methods in Swift. Here’s how to implement this functionality effectively.

Step 1: Set Your Limits

We start by defining our limits. In the example below, the initial limit is set at 100. We will also define an increment that will decide how many additional rows to load each time.

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Step 2: Modify the Number of Rows Method

Next, we need to implement the UITableViewDataSource method, numberOfRowsInSection, to return either the limit or the total number of items available if it’s lower than the limit.

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Step 3: Detect Scroll Events

To respond to the user scrolling and decide when to load more rows, we will use the willDisplay delegate method. This method notifies us when a cell is about to be displayed. We check if the user has scrolled to the last row displayed based on our limit.

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Conclusion

This simple implementation allows you to limit the number of rows initially displayed in a UITableView. As users scroll down, the app dynamically adjusts the limit, providing a smooth and efficient user experience without visual loading interruptions. The key takeaway is to manage data rendering smartly while keeping performance intact.

Further Considerations:

User Experience: Ensure that users remain aware of the amount of content available, perhaps by showing an indicator or a label.

Data Fetching: If the data set is dynamic, consider adapting this approach to fetch new data when the limit is reached.

By following this guide, you can enhance your iOS app's usability and performance with effective table view handling techniques.