请求 URL 并在警报中解析结果

Posted 2023-02-24

【中文标题】请求 URL 并在警报中解析结果

【英文标题】：Requesting URL and Parsing The Result In A Alert

【发布时间】：2020-06-26 21:48:25

【问题描述】：

我已将变量设为全局变量，但我无法弄清楚在收到响应后如何显示警报。不确定我是否必须创建功能。任何事情都会有所帮助。

代码：https://hastebin.com/izurihadib.swift

struct ContentView: View 
    @State private var showingAlert = false
    var body: some View 
        TabView 
            var str1 = ""
            var fullStr = ""
            Button(action: 
                self.showingAlert = true
                AF.request("https://api-quiz.hype.space/shows/now").responseJSON  response in
                    switch response.result 
                       case .success(let value):
                        let json = JSON(value)
                        debugPrint(json)
                        let dateFormatter = DateFormatter()
                        dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSZ"
                        dateFormatter.timeZone = TimeZone(abbreviation: "UTC")
                        let dt = dateFormatter.date(from: json["nextShowTime"].stringValue)
                        dateFormatter.timeZone = TimeZone.current
                        dateFormatter.dateFormat = "MMM d, yyyy h:mm a"
                        let nextGameName = json["upcoming"][0]["nextShowLabel"]["title"].stringValue
                        let tempStr1 = "Next Game: "
                        str1 = tempStr1 + nextGameName
                        let nextGamePrize = json["nextShowPrize"].stringValue
                        let tempStr2 = "Prize: "
                        let str2 = tempStr2 + nextGamePrize
                        let nextGameTime = dateFormatter.string(from: dt!)
                        let tempStr3 = "Date/Time: "
                        let str3 = tempStr3 + nextGameTime
                        fullStr = str2 + "\n" + str3
                    
                    case .failure(let error):
                    print(error)
                    
                
            ) 
                Text("Get Info")
            
            .alert(isPresented: $showingAlert) 
                Alert(title: Text(str1), message: Text(fullStr), dismissButton: .default(Text("OK")))
                    
             .tabItem 
                Image(systemName: "phone.fill")
                Text("First Tab")
              
           Text("The content of the second view")
             .tabItem 
                Image(systemName: "tv.fill")
                Text("Second Tab")
              
        
    

【问题讨论】：

请不要在其他网站上发布您的代码，尽量方便那些可能选择帮助您的人。请阅读the Stack Overflow question checklist。您可能还想了解Minimal, Complete, and Verifiable Examples

尝试将self.showingAlert = true 放入网络请求的成功案例中。t

它仍然显示空白警报。

【参考方案1】：

您需要进行以下更改才能解决您的问题。

struct ContentView: View 
    @State private var showingAlert = false
    @State private var str1 = ""
    @State private var fullStr = ""
    var body: some View 
        TabView 
            Button(action: 
                self.showingAlert = true
                AF.request("https://api-quiz.hype.space/shows/now").responseJSON  response in
                    switch response.result 
                    case .success(let value):
                        //...
                    case .failure(let error):
                        self.str1 = "Error"
                        self.fullStr = "\(error)"
                        self.showingAlert = true
                    
                
            ) 
                Text("Get Info")
            
            .alert(isPresented: $showingAlert) 
                Alert(title: Text(str1), message: Text(fullStr), dismissButton: .default(Text("OK")))
            
            //...