Swift 多个请求 return 相同的结果

Question

我正在对 API 进行同步 api 调用，在调试器中我发现我得到了不同的结果。但是我的代码总是 returns 相同的 Id:

func fetchIDbySKU(name: String, color: String) -> Data{
    
    
    let sku = name + ":" + color
    let appendedsku = (sku).addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)
    let url: String = "https://www.link.com/wp-json/wc/v1/products?sku=" + appendedsku!

    let semaphore = DispatchSemaphore (value: 0)

    var result = Data()
    
    var request = URLRequest(url: URL(string: url)! ,timeoutInterval: Double.infinity)
    request.addValue("Basic secret token", forHTTPHeaderField: "Authorization")

    request.httpMethod = "GET"

    let task = URLSession.shared.dataTask(with: request) { data, response, error in
        guard let data = data else {
            print(String(describing: error))
            return
        }
        
        print(String("______________________________________"))
        print(String(data: data, encoding: .utf8)!)
        result = data
        print(String("______________________________________"))
        semaphore.signal()
    }

    task.resume()
    semaphore.wait()
    return result
  }

所以结果总是 return 相同的结果，即使我在控制台中看到响应数据不同。

这是我期待 return:

的代码

var request_data = fetchIDbySKU(name: name, color: color_name)
        var product_id = String(request_data[0])
        
        parts_list.append(Item(product_id: product_id, quantity: quantity))

Answer 1

每次调用该函数时，您的信号量都会被初始化。只需从函数中取出信号量的初始化，它就可以正常工作。

    let semaphore = DispatchSemaphore (value: 0)
    
    func fetchIDbySKU(name: String, color: String) -> Data{
    
    
    let sku = name + ":" + color
    let appendedsku = (sku).addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)
    let url: String = "https://www.link.com/wp-json/wc/v1/products?sku=" + appendedsku!

    var result = Data()
    
    var request = URLRequest(url: URL(string: url)! ,timeoutInterval: Double.infinity)
    request.addValue("Basic secret token", forHTTPHeaderField: "Authorization")

    request.httpMethod = "GET"

    let task = URLSession.shared.dataTask(with: request) { data, response, error in
        guard let data = data else {
            print(String(describing: error))
            return
        }
        
        print(String("______________________________________"))
        print(String(data: data, encoding: .utf8)!)
        result = data
        print(String("______________________________________"))
        semaphore.signal()
    }

    task.resume()
    semaphore.wait()
    return result
  }

Swift 多个请求 return 相同的结果

Swift multiple requests return the same result

synchronization

get

request

ios

swift