Скачать или смотреть Tackling Async/Await in Swift: A Guide to Handling Networking with Retries and Success Conditions

Discover how to transition your Swift app from completion handlers to `async/await`, properly managing network requests with retries on failure while maintaining success conditions in your code.
---
This video is based on the question https://stackoverflow.com/q/78186928/ asked by the user 'matt' ( https://stackoverflow.com/u/341994/ ) and on the answer https://stackoverflow.com/a/78188185/ provided by the user 'Rob' ( https://stackoverflow.com/u/1271826/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, comments, revision history etc. For example, the original title of the Question was: Swift concurrency async/await with do-something-only-on-success and retry

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Managing Networking in Swift with Async/Await

In the world of Swift development, particularly when working with networking tasks, the move to async/await offers many advantages over traditional completion handlers. However, developers can face challenges, especially when trying to implement retry logic or handling conditions based on the success of task completion.

The Problem

Imagine you have a function that handles network requests, and based on whether the request succeeds, you need to execute additional logic. In the old style, you'd likely use a completion handler to signal success or failure. Here’s a simple version of that approach:

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

While this approach works, it can lead to messy nested code and is not in line with the modern async/await paradigm, which aims to simplify asynchronous programming.

The Solution

To solve this problem while adopting async/await, you can create more streamlined functions that handle retry logic directly within the network-fetching functions. Below, we outline a couple of approaches that can replace the old completion handler paradigm.

Recursive Approach

The recursive approach keeps retrying the network request until it succeeds or the user cancels. Here's how you can implement it:

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

Non-Recursive Approach

Alternatively, you could implement a non-recursive method with a loop that allows for a maximum number of retries:

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

Handling Alerts with Continuations

To manage alerts effectively in a async/await setup, you can utilize continuations. Here’s how you can create the alert in an asynchronous manner:

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

This approach allows your app to handle user interactions more gracefully while adhering to the structure desired in a modern Swift app.

Conclusion

Transitioning to async/await in Swift is a powerful move for simplifying asynchronous code. By properly implementing retries and handling success conditions without relying on completion handlers, developers can write clearer, more maintainable code.

Remember, there isn't a 'one-size-fits-all' approach to implementing retries and success handling in networking. Experiment with both recursive and iterative strategies, and choose what fits best with your application's architecture and user experience.

By utilizing these techniques, you can ensure that your app remains responsive and user-friendly even when faced with network challenges.