Created
January 29, 2024 15:18
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Generic URLSession call
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// Generic function to fetch and decode JSON into a Codable object | |
func fetchDecodedObject<T: Codable>(from urlString: String, completion: @escaping (Result<T, NetworkError>) -> Void) { | |
// Step 1: Create a URL instance | |
guard let url = URL(string: urlString) else { | |
completion(.failure(.badURL)) | |
return | |
} | |
// Step 2: Create a URLSession | |
let session = URLSession.shared | |
// Step 3: Create a URLSessionDataTask | |
let task = session.dataTask(with: url) { (data, response, error) in | |
// Step 4: Handle the Data, Response, and Error | |
if let error = error { | |
completion(.failure(.requestFailed(error))) | |
return | |
} | |
guard let httpResponse = response as? HTTPURLResponse, httpResponse.statusCode == 200 else { | |
completion(.failure(.badStatusCode((response as? HTTPURLResponse)?.statusCode ?? -1))) | |
return | |
} | |
guard let data = data else { | |
completion(.failure(.requestFailed(error!))) | |
return | |
} | |
// Decode the JSON data into the generic type T | |
do { | |
let decodedObject = try JSONDecoder().decode(T.self, from: data) | |
completion(.success(decodedObject)) | |
} catch let decodingError { | |
completion(.failure(.decodingFailed(decodingError))) | |
} | |
} | |
// Start the task | |
task.resume() | |
} |
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struct MyModel: Codable { | |
var property1: String | |
var property2: Int | |
// ... other properties | |
} | |
enum NetworkError: Error { | |
case badURL | |
case requestFailed(Error) | |
case badStatusCode(Int) | |
case decodingFailed(Error) | |
} | |
fetchDecodedObject(from: "https://api.example.com/endpoint") { (result: Result<MyModel, NetworkError>) in | |
switch result { | |
case .success(let model): | |
print(model) | |
case .failure(let error): | |
print("Error: \(error)") | |
} | |
} |
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