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更改子地址后保留json数据。iOS,斯威夫特

caching parsing swift ios

-1

Tony Merritt · 技术社区 · 6 年前

我正在获取json数据并对其进行解析,但是由于某种原因,当我将地址更改为不同的json并调用函数时(我在album search中更改了一个eliment),我在json中获得了相同的数据。我想它已经被缓存了。

这是我的地址:

var SEARCH_RESULTS_ADDRESS = "\(BASE_URL)\(choiceSearch!).search&\(choiceSearch!)=\(albumSearch)&api_key=\(API_KEY)&format=json"

这是我的AddressDataService函数。

func getAlbumData(completion: @escaping (_ finished: Bool) -> ()) {
    guard let url = URL(string: SEARCH_RESULTS_ADDRESS) else { return }

    URLSession.shared.dataTask(with: url) { (data, response, err) in

        guard let data = data else { return }
        do {

            let decoder = JSONDecoder()
            let albumDataFull = try decoder.decode(Root.self, from: data)
            albumInfo = []
            for business in albumDataFull.results.albummatches.album {
                let artist = business.artist!
                let name = business.name!
                let imgUrl = business.image

                let albumInd = ["name":name, "artist":artist, "url":url, "imgUrl":imgUrl] as [String : Any]

                albumInfo.append(albumInd)
                print("Tony: \(albumInfo.count)")

            }

            completion(true)
        }catch let jsonErr {
            print("Error seroalizing json", jsonErr)
        }
        }.resume()
}

这是我的转载数据和地址变更。

func getData(completion: @escaping (_ finished: Bool) -> ()) {
    AlbumDataService().getAlbumData(completion: { (complete) in
        completion(true)

    })
}

func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
    albumSearch = searchBar.text
    albumInfo = []
    getData(completion: { (complete) in
        DispatchQueue.main.async {
            SEARCH_RESULTS_ADDRESS = "\(BASE_URL)\(choiceSearch!).search&\(choiceSearch!)=\(albumSearch!)&api_key=\(API_KEY)&format=json"
            print(SEARCH_RESULTS_ADDRESS)
            self.tableView.reloadData()
            print("Tony Finishedediting \(albumSearch!)")
        }
    })
}

1 回复 | 直到 6 年前

OOPer 6 年前

你需要设置 SEARCH_RESULTS_ADDRESS 它被使用了。

func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
    albumSearch = searchBar.text
    albumInfo = []
    //###
    SEARCH_RESULTS_ADDRESS = "\(BASE_URL)\(choiceSearch!).search&\(choiceSearch!)=\(albumSearch!)&api_key=\(API_KEY)&format=json"
    print(SEARCH_RESULTS_ADDRESS)
    getData(completion: { (complete) in
        DispatchQueue.main.async {
            self.tableView.reloadData()
            print("Tony Finishedediting \(albumSearch!)")
        }
    })
}

(补充)

假设您可以修改 AddressDataService :

func getAlbumData(_ urlString: String, completion: @escaping (_ finished: Bool) -> ()) {
    print(urlString)
    guard let url = URL(string: urlString) else {
        print("ursString is invalid")
        return
    }

    //...
}

你可以把它当作:

func getData(_ urlString: String, completion: @escaping (_ finished: Bool) -> ()) {
    AlbumDataService().getAlbumData(urlString)  { complete in
        completion(true)
    }
}

func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
    albumSearch = searchBar.text
    albumInfo = []
    let searchResultsAddress = "\(BASE_URL)\(choiceSearch!).search&\(choiceSearch!)=\(albumSearch!)&api_key=\(API_KEY)&format=json"
    getData(searchResultsAddress) { complete in
        DispatchQueue.main.async {
            self.tableView.reloadData()
            print("Tony Finishedediting \(albumSearch!)")
        }
    }
}