Consume Json Data - Webservice Swift 2 - iOS

Question

I need Query price in the search api (returns in json) in my app with Swift 2. Could someone help me do this or indicate a tutorial on how to do ?

How you use the search api : Using the Search API to get a list of products using the Find Product List

link to test : http://sandbox.buscape.com.br/service/findProductList/554163674d2f57624d676f3d/BR/? categoryId=77&keyword=Samsung

Answer 1

You can use the library Alembic to carry out your requisitions, she and the most stable and built up Swift 2.0, others as Afnetworking are not so encouraged to still be made in Objetive-C.

To add to your project manually, you can watch one of these videos: Alamofire - Youtube.

Or simply follow the tutorial in the github documentation.

A tip to manage these libraries/components that you need to install in your project and the Cocoapods, it and a dependency manager such as php.

On the same site you can find an installation tutorial for it, and how to include libraries.

After you’ve added the Alamofire to your project just make a request like this:

 let url = "http://sandbox.buscape.com/service/findProductList/564771466d477a4458664d3d/?keyword=samsung"
Alamofire.request(.GET, url)
  .responseJSON {
    response in
      print(response.request) // original URL request
    print(response.response) // URL response
    print(response.data) // server data
    print(response.result) // result of response serialization

    if let JSON = response.result.value {
      print("JSON: \(JSON)")
    }

Answer 2

You can use Nsurlsession dataTaskWithURL and create a method to asynchronously download the data as follows:

func searchBuscape(query: String) {
    guard
        let escapedSearch = query.stringByAddingPercentEncodingWithAllowedCharacters(.URLQueryAllowedCharacterSet()),
        url = NSURL(string:  "http://sandbox.buscape.com.br/service/findProductList/554163674d2f57624d676f3d/BR/?categoryId=77&keyword=\(escapedSearch)&format=json")
    else { return }
    NSURLSession.sharedSession().dataTaskWithURL(url, completionHandler: { (data, response, error) -> Void in
        guard
            let httpURLResponse = response as? NSHTTPURLResponse where httpURLResponse.statusCode == 200,
            let data = data where error == nil
        else { return }
        dispatch_async(dispatch_get_main_queue()) { () -> Void in
            var error: NSError?
            let json = JSON(data: data, options: .AllowFragments, error: &error)
            if let error = error {
                print(error.localizedDescription)
            }

            print("===json start")
            print(json)
            print("===json end")

            print(json["totalresultsreturned"])  // 16
            print(json["product"][0]["product"]["pricemin"])  // 819.90
            print(json["product"][0]["product"]["pricemax"])  // 1199.00

            // pra voce extrair um array de dicionários do json object você precisa acessar arrayObject property da segunte forma
            if let products = json["product"].arrayObject as? [[String:AnyObject]] {
                for product in products {
                    print("productStart=======")
                    print(product)
                    print("productEnd=======")
                }
                let pricesArrayMin = products.map{$0["product"]?["pricemin"]??.doubleValue ?? 0}.sort()
                print("pricesMinStart=======")
                print(pricesArrayMin)
                print(pricesArrayMin.count)    // 16
                print(pricesArrayMin.first!)   // 539.1    (produto mais barato)
                print(pricesArrayMin.last!)    // 2898.99
                print("pricesMinEnd=======")
            }
        }
    }).resume()
}

Don’t forget to edit info.plist to add to App Transport Security Settings the domain of the search-stand or use https. You will also need to add the file Swiftyjson.Swift to your project.