Скачать или смотреть Solving API Call Challenges in SwiftUI Views

Explore effective techniques to display `API` call data in new `SwiftUI` views and overcome common challenges.
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This video is based on the question https://stackoverflow.com/q/71782648/ asked by the user 'Swink' ( https://stackoverflow.com/u/8023463/ ) and on the answer https://stackoverflow.com/a/71782911/ provided by the user 'burnsi' ( https://stackoverflow.com/u/6950415/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving API Call Challenges in SwiftUI Views: A Comprehensive Guide

When working with SwiftUI and API calls, it can sometimes be tricky to display the data retrieved from a remote server in a new view. This challenge often arises when the view tries to render before the API call is complete. In this guide, we'll discuss a common problem developers face when attempting to display API data and provide a structured solution to ensure that your app functions smoothly.

The Problem

A developer is trying to implement a feature where the user enters a food item in a text field, and upon submission, the app makes an API call to retrieve related information. The challenge comes when the developer attempts to pass the retrieved data to a new view. Although the retrieval works in a Text view, passing the data to a separate view leads to issues, often resulting in displaying stale or empty information.

This situation usually stems from the view being loaded before the completion of the API call. The developer suspects they might be loading their view prematurely, but a clearer understanding of how SwiftUI handles state and view updates is necessary.

The Solution

Let's break down the solution into clearly defined sections to resolve the issues.

Step 1: Structure the API Call

The first step is to ensure the API call is well-structured. The current implementation uses an ObservableObject with a @ Published variable, which is correct. Here’s a simplified version of how the API class should look:

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Step 2: Update the Main View

Instead of introducing a separate variable (foodName) in the main view to store the food description, we can pass the foodApi object directly to the subview using the @ EnvironmentObject property wrapper. This way, the food description can be directly accessed in the result view.

Here’s an updated version of the main view:

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

Step 3: Accessing the Data in the Result View

In the result view, instead of using a Binding for food description, use it directly from the foodApi object. This ensures that any updates to foodDescription are reflected immediately in the view.

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

Conclusion

By restructuring your code to utilize @ EnvironmentObject, you can effectively manage your data flow and ensure that any updates caused by your API calls are accurately reflected in your views. This method not only resolves the timing issue of loading your view but also streamlines your state management in SwiftUI.

With these adjustments, you're now equipped to confidently make and display API calls in your SwiftUI applications!