无法将 'Int' 类型的值转换为 SwiftUI/Playgrounds 中预期的参数类型 'string'

Question

有点像 sequel 到已经回答了。无论如何，我有一个 URL 会话要发送到 webhook。我已经设置了字符串查询，但我尝试使用 Stepper 控件值进行查询，并将其添加到 URLQueryItem 的列表中，但我收到一条错误消息 Cannot convert value of type 'int' to expected argument type 'string'。所以事实证明步进器中的值实际上是一个整数（或 Int 类型）而不是字符串。

这是代码


struct ContentView: View {
    
    @State private var TweetStatus = ""
    @State private var response = ""
    @State var showAlert = false
    @State var SendToWebhook = false
    @State var StepperValue = 0
    
    var body: some View {
        NavigationView {
            Form {
                Section(footer: Text("Test")) {
                    TextField("Field to place response data", text: $response)
                    TextEditor( text: $TweetStatus)
                        .frame(height: 100)
                    
                    // Stepper
                    Stepper(value: $StepperValue, in: 0...10080) {
                        Text("Duration in Minutes: \(StepperValue)")
                    }
                    
                }
                Section {
                    
                    Button("Get Data") {
                        requestTest() { results in
                            response = results
                            if response == "No Data!" {
                                showAlert = true
                            }
                        }
                    }
                    
                    
                }
            }
            .alert(isPresented: $showAlert) {
                Alert(title: Text("Tweet Sent"), message: Text("Your Tweet is sent! Your Tweet ID is shown in the field"), dismissButton: .default(Text("OK")))
            }
        }
    }
    func requestTest(completion: @escaping(String) -> ()) {   // <--- here completion closure
        if let url = URL(string: "http://requestbin.net/r/dooek323") {
            
            var request = URLRequest(url: url)
            request.httpMethod = "POST"
            request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
            
            var components = URLComponents(url: url, resolvingAgainstBaseURL: false)!
            components.queryItems = [ URLQueryItem(name: "TweetID", value: response), 
                                      URLQueryItem(name: "Status", value: TweetStatus), 
                                      URLQueryItem(name: "PollDuration", value: StepperValue)]
            
            if let query = components.url!.query {
                request.httpBody = Data(query.utf8)
            }
            
            let task = URLSession.shared.dataTask(with: request) { data, response, error in
                if let data = data,
                   let apiResponse = String(data: data, encoding: .utf8) {
                    
                    // IF Completed, these actions are shown below
                    
                    completion(apiResponse)    // <--- here
                    self.showAlert = true
                    TweetStatus = ""
                } else {
                    completion("No Data!")   // <--- here
                }
            }
            task.resume()
        }
    }
}

所以我想做的是将 id StepperValue 作为字符串传递给 URLQueryItem。我什至不能使用 String(SOMETHING)，也无济于事。我认为它是 Swift 5.5，因此必须对此进行一些代码更改。

Answer 1

首先请以小写字母开头的变量命名。

一个URL实际上是一个字符串，即使是一个数值也必须是一个字符串。

因此将整数显式转换为字符串。

URLQueryItem(name: "PollDuration", value: String(stepperValue))]

无法将 'Int' 类型的值转换为 SwiftUI/Playgrounds 中预期的参数类型 'string'

Cannot convert value of type 'Int' to expected argument type 'string' in SwiftUI/Playgrounds

ios

swift

swift-playground

swiftui