Question

我有一个填充了JSON数据的表视图。到现在为止还挺好！但是我希望只有当json中的id等于特定的内容时才会填充我的表视图（行数）。就我而言：＆＃34; ttc_proposta_tipo_id＆＃34; =＆＃34; e0eb2736-433e-475e-876d-bcc6b460e1e3＆＃34;

如果没有，返回0

我不知道我是否足够清楚，这是我的第一个问题。

感谢名单

我的代码：

class NavigationTest: UIViewController{

@IBOutlet weak var btnAddProposta: UIBarButtonItem!
@IBOutlet var tableView: UITableView!

let searchController = UISearchController(searchResultsController: nil)

var propostas = [Proposta]()

private var refreshControl = UIRefreshControl()

override func viewDidLoad() {
    super.viewDidLoad()
    setupSideMenu()
    fetchJSON()
    self.tableView.register(CustomCell.self, forCellReuseIdentifier: "cell")

}

struct Proposta: Decodable {
    let TtcProposta: TtcProposta
    let TtcBasaFinalidade: TtcBasaFinalidade
    let TtcCar: [TtcCar]?

    enum CodingKeys: String, CodingKey {
        case TtcProposta = "TtcProposta"
        case TtcBasaFinalidade = "TtcBasaFinalidade"
        case TtcCar = "TtcCar"
    }
}

struct TtcProposta: Decodable {
    let id: String?
    let user_id: Int?
    let versao: String?
    let status_processo: String?
    let finalidade: String?
    let valor_proposta: String?
    let detalhes_json: detalhes_json?
    let ativo: Bool?
    let modified: String?
    let inst_financeira_id: String?
    let ttc_basa_finalidade_id: String?
    let seq: Int?
    let ttc_proposta_tipo_id: String?
    let data_envio: String?
    let liberado_banco: String?
    let numero_fip: String?
    let numeroProtocolo: String?
    let created: String?
}

fileprivate func fetchJSON() {
    let urlPath = "http://credito-homologacao.branch.terras.agr.br/ttc/ttc_propostas/get_by_user"
    let url = NSURL(string: urlPath)
    let session = URLSession.shared
    let request = NSMutableURLRequest(url: url! as URL)
    request.httpMethod = "GET" // make it post if you want
    let task = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in


        guard let data = data else { return }

        do {
            let decoder = JSONDecoder()
            // Swift 4.1
            decoder.keyDecodingStrategy = .convertFromSnakeCase
            self.propostas = try decoder.decode([Proposta].self, from: data)


            DispatchQueue.main.async {
                self.tableView.reloadData()
            }
        } catch let jsonErr {
            print("Error serializing json:", jsonErr)
        }
    })
    task.resume()
}

延伸：

extension NavigationTest: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    //THIS IS WHAT TRIED AND IT DIDNT WORK
    //ERROR:Value of type '[NavigationTest.Proposta]' has no member 'TtcProposta'

    if propostas.TtcProposta.ttc_proposta_tipo_id == "e0eb2736-433e-475e-876d-bcc6b460e1e3" {
        return propostas.count
    }
    return 0

}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell") as! CustomCell
    let proposta = propostas[indexPath.row]

    cell.delegate = self

    cell.numeroProposta.text = proposta.TtcProposta.numeroProtocolo
    cell.proponenteNome.text = proposta.TtcProposta.finalidade

    return cell
}

Answer 1

不要在numberOfRowsInSection中执行此操作，这是错误的地方，请在解码JSON后立即查看。

创建一个包含所有id值的数组，并检查它是否包含给定的id。如果检查成功，则分配result，否则分配一个空数组。

let result = try decoder.decode([Proposta].self, from: data)
let ids = result.compactMap { $0.TtcProposta.id }
if ids.contains("e0eb2736-433e-475e-876d-bcc6b460e1e3") {
    self.propostas = result 
} else {
    self.propostas = []
}

编辑：如果您想过滤给定id的所有元素，请写

let result = try decoder.decode([Proposta].self, from: data)
self.propostas = result.filter { $0.TtcProposta.id == "e0eb2736-433e-475e-876d-bcc6b460e1e3" }

并照常返回numberOfRowsInSection

return propostas.count

附注：您为什么设置选项.convertFromSnakeCase但不使用 camelCased 属性名称？

Answer 2

使用过滤器是最简单的。

let decoder = JSONDecoder()
// Swift 4.1
decoder.keyDecodingStrategy = .convertFromSnakeCase
self.propostas = try decoder.decode([Proposta].self, from: data).filter { return $0.ttc_proposta_tipo_id == "e0eb2736-433e-475e-876d-bcc6b460e1e3" }

If语句的行数

2 个答案: