在能够从“业务匹配”端点检索到“业务ID”之后，我现在正尝试使用该业务ID将其传递到“业务详细信息”端点。我正在学习有关调用API的知识，所以请耐心等待。谢谢！
以下代码使我可以进行业务匹配：
调用API->
import Foundation
import Moya
private let apiKey = ""
enum YelpService {
enum BusinessMatch: TargetType {
case match(name: String, address1: String, city: String, state: String, country: String)
public var baseURL: URL { return NSURL(string: "https://api.yelp.com")! as URL
}
public var path: String {
switch self {
case .match:
return "/v3/businesses/matches"
}
}
var method: Moya.Method {
return.get
}
var sampleData: Data {
return Data()
}
var task: Task {
switch self {
case let .match(name, address1, city, state, country):
return .requestParameters(parameters: ["name": name, "address1": address1, "city": city, "state": state, "country": country, "limit": 1], encoding: URLEncoding.queryString)
}
}
var headers: [String : String]? {
return ["Authorization": "Bearer \(apiKey)"]
}
}
}
返回业务匹配端点->
import UIKit
import CoreData
import Moya
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
let service = MoyaProvider<YelpService.BusinessMatch>()
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions:[UIApplication.LaunchOptionsKey: Any]?) -> Bool {
service.request(.match(name: "Sushi Damo", address1:
"330 W 58th St", city: "New York", state: "NY", country: "US")) { (result) in
switch result {
case .success(let response):
print(try? JSONSerialization.jsonObject(with: response.data, options: []))
case .failure(let error):
print("Error: \(error)")
}
}
return true
}
func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
// Called when a new scene session is being created.
// Use this method to select a configuration to create the new scene with.
return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
}
func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
// Called when the user discards a scene session.
// If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
// Use this method to release any resources that were specific to the discarded scenes, as they will not return.
}
// MARK: - Core Data stack
lazy var persistentContainer: NSPersistentContainer = {
/*
The persistent container for the application. This implementation
creates and returns a container, having loaded the store for the
application to it. This property is optional since there are legitimate
error conditions that could cause the creation of the store to fail.
*/
let container = NSPersistentContainer(name: "APITest")
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {
// Replace this implementation with code to handle the error appropriately.
// fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
/*
Typical reasons for an error here include:
* The parent directory does not exist, cannot be created, or disallows writing.
* The persistent store is not accessible, due to permissions or data protection when the device is locked.
* The device is out of space.
* The store could not be migrated to the current model version.
Check the error message to determine what the actual problem was.
*/
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
return container
}()
// MARK: - Core Data Saving support
func saveContext () {
let context = persistentContainer.viewContext
if context.hasChanges {
do {
try context.save()
} catch {
// Replace this implementation with code to handle the error appropriately.
// fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
let nserror = error as NSError
fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
}
}
}
}
致电业务匹配端点后，我收到以下信息：
Optional({
businesses = (
{
alias = "sushi-damo-new-york";
coordinates = {
latitude = "40.76778";
longitude = "-73.98358";
};
"display_phone" = "(212) 707-8609";
id = J85NKgA4tOgBAoqxu0vBNw;
location = {
address1 = "330 W 58th St";
address2 = "";
address3 = "";
city = "New York";
country = US;
"display_address" = (
"330 W 58th St",
"New York, NY 10019"
);
state = NY;
"zip_code" = 10019;
};
name = "Sushi Damo";
phone = "+12127078609";
}
);
})
我希望能够从任何业务匹配结果中自动提取该业务ID。问题出在以下代码中。
调用API->
enum YelpDetails {
enum BusinessDetail: TargetType {
case BusinessID(id: String)
public var baseURL: URL { return NSURL(string: "https://api.yelp.com")! as URL
}
public var path: String {
switch self {
case .BusinessID:
return "https://api.yelp.com/v3/businesses/{id}"
}
}
var method: Moya.Method {
return.get
}
var sampleData: Data {
return Data()
}
var task: Task {
switch self {
case let .BusinessID(id):
return .requestParameters(parameters: ["BusinessID": id], encoding: URLEncoding.queryString)
}
}
var headers: [String : String]? {
return ["Authorization": "Bearer \(apiKey)"]
}
}
}
从“业务详细信息”端点返回结果->
let information = MoyaProvider<YelpDetails.BusinessDetail>()
func call(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions:[UIApplication.LaunchOptionsKey: Any]?) -> Bool {
information.request(.BusinessID(id: "J85NKgA4tOgBAoqxu0vBNw")) {
(result) in
switch result {
case .success(let response):
print(try? JSONSerialization.jsonObject(with:
response.data, options: []))
case .failure(let error):
print("Error: \(error)")
}
}
return true
}
答案 0 :(得分：1)
通常，当从网络上获取JSON数据时，您想要做的就是将其序列化为可以在Swift中使用的对象。幸运的是，Swift有一些工具可以轻松地将json转换为对象并再次转换回，即Codable协议。请查看this video，以了解更多信息。但是实质上，这需要查看从服务器获得的响应，并创建一个反映该响应的struct或class。因此，在您的情况下，从服务器返回的原始json如下：
{
"businesses": [
{
"id": "J85NKgA4tOgBAoqxu0vBNw",
"alias": "sushi-damo-new-york",
"name": "Sushi Damo",
"coordinates": {
"latitude": 40.76778,
"longitude": -73.98358
},
"location": {
"address1": "330 W 58th St",
"address2": "",
"address3": "",
"city": "New York",
"zip_code": "10019",
"country": "US",
"state": "NY",
"display_address": [
"330 W 58th St",
"New York, NY 10019"
]
},
"phone": "+12127078609",
"display_phone": "(212) 707-8609"
}
]
}
这是具有一个键businesses的字典，其字典数组的值带有描述业务的键值对。使用上面的JSON，数组中只有一个元素。
因此，既然我们对响应的外观有所了解，就可以开始创建一些符合Codable的结构。我们知道我们需要一个顶层struct，其属性为businesses，该属性是一个数组，其中包含描述每个业务的结构。
struct BusinessesResponse: Codable {
let businesses: [BusinessResponse]
}
接下来，您创建BusinessResponse。现在，如果您只关心id，则可以使BusinessResponse为：
struct BusinessResponse: Codable {
let id: String
}
然后在此处更新您的回复方式：
service.request(.match(name: "Sushi Damo", address1:
"330 W 58th St", city: "New York", state: "NY", country: "US")) { (result) in
switch result {
case .success(let response):
print(try? JSONSerialization.jsonObject(with: response.data, options: []))
case .failure(let error):
print("Error: \(error)")
}
}
我们不需要序列化JSON对象，而是将其解码为BusinessesResponse结构，可以通过将switch语句更新为：
switch result {
case .success(let response):
let businessesResponse = try? JSONDecoder().decode(BusinessesResponse.self, from: response.data)
let firstID = businessesResponse?.businesses.first?.id
// Do something with ID
case .failure(let error):
print("Error: \(error)")
}
我认为下一个请求不会按书面要求工作。在此请求中，通过URL的路径发送参数，即企业的ID。因此，path应该是：
public var path: String {
switch self {
case let .BusinessID(id):
return "v3/businesses/\(id)"
}
}
因此task不再需要处理参数，应该是：
var task: Task {
switch self {
case .BusinessID:
return .requestParameters(parameters:[:], encoding: URLEncoding.queryString)
}
}