如何在 Swift 中访问 GitHub API？

Question

I'd like to make an update detection system in my macOS SwiftUI app by pulling the latest release from GitHub via the API and then comparing the tag. How would I go about accessing the API from Swift? I've tried using the methods from here, medium.com , here, swifttom.com and here, steveclarkapps.com but none of them accomplish what I'm trying to do.

For the first method, the code functions with the provided example API, but doesn't work with the GitHub API and it returns this error instead:

Fatal error: 'try!' expression unexpectedly raised an error: Swift.DecodingError.typeMismatch(Swift.Array<Any>, Swift.DecodingError.Context(codingPath: [], debugDescription: "Expected to decode Array<Any> but found a dictionary instead.", underlyingError: nil))

Method 2 suffers the same issue.

I couldn't even get enough of method 3's code working to try it.

Here's my adapted code based off of the medium.com method:

Model.swift

import Foundation

struct TaskEntry: Codable {
    let id: Int
    let tag_name: String
    let name: String
}

ContentView.swift

import SwiftUI

struct ContentView: View {
    @State var results = [TaskEntry]()
        
    var body: some View {
        List(results, id: \.id) { item in
            VStack(alignment: .leading) {
                Text(item.name)
            }
        }.onAppear(perform: loadData)
    }
    func loadData() {
        guard let url = URL(string: "https://api.github.com/repos/NCX-Programming/RNGTool/releases/latest") else {
            print("Invalid URL")
            return
        }
        let request = URLRequest(url: url)

        URLSession.shared.dataTask(with: request) { data, response, error in
            if let data = data {
                /*if*/ let response = try! JSONDecoder().decode([TaskEntry].self, from: data) /*{*/
                    DispatchQueue.main.async {
                        self.results = response
                    }
                    return
                /*}*/
            }
        }.resume()
    }
}

Commented out code and variable names that seem irrelevant are just leftovers.

OS: macOS Big Sur 11.6 Xcode version: 13.0

Answer 1

Open this in your browser:

https://api.github.com/repos/NCX-Programming/RNGTool/releases/latest

You will notice it is not an array but an object. You should be decoding an object like this:

JSONDecoder().decode(TaskEntry.self, from: data)