How do I migrate from legacy code with URLSession in Swift?

To migrate from legacy code with URLSession in Swift, you’ll need to understand the transition between the older methods of handling HTTP requests and the modern Swift syntax along with URLSession's capabilities. The new approach often focuses on better error handling and utilizing closures or async/await for asynchronous tasks.

Below is an example of how to convert a simple legacy URL request using callbacks to a more modern implementation using async/await:

// Legacy code using URLSession let url = URL(string: "https://api.example.com/data")! let task = URLSession.shared.dataTask(with: url) { data, response, error in if let error = error { print("Error: \(error)") return } guard let data = data else { return } // Process data } task.resume() // Modern code using async/await func fetchData() async { let url = URL(string: "https://api.example.com/data")! do { let (data, response) = try await URLSession.shared.data(from: url) // Process data } catch { print("Error: \(error)") } }

URLSession Swift migration async/await iOS networking legacy code

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