我的API调用因未知错误而中断.这是什么原因造成的

Question

以下代码几天前还可以使用。我不知道更新了什么，也许是新的14.4？但它今天突然停止工作，出现了一个不伦不类的错误，我不知道这里出了什么问题。

FetchStockAPIApp.swift

import SwiftUI
@main
struct FetchStockAPIApp: App {
@StateObject public var stocks = TFViewModel()

var body: some Scene {
WindowGroup {
ContentView(stocks: stocks)
}
}
}

ContentView.swift

import SwiftUI
struct ContentView: View {
@ObservedObject var stocks : TFViewModel

let isSSL = false
public var url : String = "http://10.0.0.41:8111/xyz123"
public var sslurl: String = "https://domain.name:8100/xyz123"

var body: some View {
ScrollView {
ForEach(stocks.tfstocks!, id: .recid) { item in
Text("123")
}
}
.onAppear {stocks.fetchData(apiUrl: isSSL ? sslurl : url)}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView(stocks: TFViewModel())
}
}

TFDataModel.swift

import SwiftUI
struct TFStock: Codable, Hashable {
var recid = UUID()
var symbol: String
var Close: Double
}

class TFViewModel: ObservableObject {
@Published var tfstocks: [TFStock]? = [TFStock]()

func fetchData(apiUrl: String) {

guard let url = URL(string: apiUrl) else {
print("URL is not valid")
return
}

let request = URLRequest(url: url)

URLSession.shared.dataTask(with: request) {
data, response, error in
if let data = data {  // data is Optional, so
// you need to unwrap it
if let decodedResult = try?
JSONDecoder().decode(
[TFStock].self, from: data) {
// decoding is successful
DispatchQueue.main.async {
// assign the decoded articles to
// the state variable
self.tfstocks = decodedResult
}
//print(decodedResult)
return
}
}
print("Error: (error?.localizedDescription ?? "Unknown error in API Fetch")")
}.resume()
}
}

从SSL url中删除XXX，使API调用在代码中工作。如果有人能在这里帮助我，我将不胜感激。

您需要将isSSL=true设置为ON，以便使用域名，因为其他IP在我的本地网络上只是同一个API。

Answer 1

我建议您阅读更多关于Codable协议及其用途的信息。您可以参考下面的链接。

https://medium.com/@pleelaprasad/codable-protocols-in-swift-76f8b088c483。

catch块在下面为您的代码打印错误。

keyNotFound(编码键(字符串值："recid"，intValue:nil(，Swift。DecodingError.Context(编码路径：[_JSONKey(字符串值："索引0"；，intValue:0(]，debugDescription:"；没有与键关联的值编码键(字符串值："recid"，intValue:nil(("recid"(&"；，underlyingError:nil((错误：API获取中出现未知错误

我已经使用poster验证了这一点。

以下是有效的解决方案。

import SwiftUI
struct ContentViewsss: View {
@ObservedObject var stocks : TFViewModel

let isSSL = true
public var url : String = "http://10.0.0.41:8111/xyz123"
public var sslurl: String = "https://domain.name/xyz123"

var body: some View {
ScrollView {
ForEach(stocks.tfstocks!, id: .recid) { item in
Text(item.symbol)
}
}
.onAppear {stocks.fetchData(apiUrl: isSSL ? sslurl : url)}
}
}
struct TFStock: Codable, Hashable {
var recid = UUID()
var symbol: String
var Close: Double

private enum CodingKeys : String, CodingKey {
case  symbol, Close
}
}

class TFViewModel: ObservableObject {
@Published var tfstocks: [TFStock]? = [TFStock]()

func fetchData(apiUrl: String) {

guard let url = URL(string: apiUrl) else {
print("URL is not valid")
return
}

let request = URLRequest(url: url)

URLSession.shared.dataTask(with: request) {
data, response, error in
if let data = data {  // data is Optional, so
// you need to unwrap it

do{
let decodedResult = try
JSONDecoder().decode(
[TFStock].self, from: data)
// decoding is successful
DispatchQueue.main.async {
// assign the decoded articles to
// the state variable
self.tfstocks = decodedResult
}
//print(decodedResult)
return

}catch let error{
print(error)
}

}
print("Error: (error?.localizedDescription ?? "Unknown error in API Fetch")")
}.resume()
}
}