How to Efficiently Loop Through API Call Data in SwiftUI

Discover how to loop through your API call data in SwiftUI using the right syntax while avoiding common errors.
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Looping Through API Call Data in SwiftUI

When working with SwiftUI, one of the common tasks developers encounter is displaying data fetched from an API. In this guide, we’ll explore a practical example of how to loop through API call data and display it in a SwiftUI view.

The Challenge

You may already be familiar with using ForEach, a powerful SwiftUI feature that allows for iteration over collections. However, many developers often face syntax issues when implementing it, particularly when dealing with asynchronous data fetching from APIs. For instance, one of our readers encountered errors while trying to display device information fetched from an API. Let’s take a look at their code to understand the challenge better.

Evaluating the Existing Code

The reader's implementation includes a HomeTab view where they are attempting to display devices fetched from an API. Here’s a simplified version of the key parts:

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

The Issue

A More Effective Solution

To resolve the issue seamlessly, we can follow these steps:

Correct the Data Source: Use the devices property in the ForEach instead of calling getDevices() every time.

Ensure Identifiability: Make sure that your Device model conforms to the Identifiable protocol, which will simplify the usage of ForEach without the need for an explicit ID.

Here’s an updated version of the devices property in the HomeTab view:

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

Modify the Device Model

You should also modify the Device model to ensure it is Identifiable:

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

By making these adjustments, the ForEach will iterate over the already fetched devices array and display the device name and status correctly without any syntax errors or issues.

Conclusion

In summary, when displaying data fetched from an API in SwiftUI, make sure to loop through the properties that store the API data rather than calling the fetching function directly in your views. This approach will help prevent unexpected behavior and make your code cleaner. By following the tips shared in this blog, you can efficiently display API data in your SwiftUI application.

Feel free to tweak the code as per your needs and happy coding!