swiftui 将变量传递到另一个视图 [英] swiftui passing variable into antoher view

问题描述

嘿，下面你可以找到我的源代码.我想做的是:

Hey below you find my source code. What i wanna do is:

提取 Json 后，我希望它可以在其他视图中访问...请帮帮我...

After the Json is extracted I want that it will be accessable in a other view... Please help me...

我的意思是提取的值:"\n (users.Name)"

I Mean the extracted Value: "\n (users.Name)"

所以我只想将响应数据放入另一个视图中...

So I want simply the response data into a other view...

struct User: Codable {
let Name: String
}

let url = URL(string: "http://192.168.178.26/iso/loginserv.php")
                guard let requestUrl = url else { fatalError() }

                var request = URLRequest(url: requestUrl)
                request.httpMethod = "POST"

                let postString = "user=\(self.user)&pass=\(self.pass)";

                request.httpBody = postString.data(using: String.Encoding.utf8);

                let task = URLSession.shared.dataTask(with: request) {
                    (data, response, error) in

                    if let error = error {
                        print("Error took place \(error)")
                        return
                    }

                    guard let data = data else {return}

                    do{
                        let users = try JSONDecoder().decode(User.self, from: data)
                        print("Response data Name: \n \(users.Name)")


                        if !(data.isEmpty) {
                            self.signedIn = true
                        }

                    }catch let jsonErr{
                        print(jsonErr)
                    }

                }


                task.resume()

我想要的是将标记的东西放到另一个视图中...

推荐答案

你可以做的是使用单例设计模式.

What you could do is use Singleton design pattern.

基本上，您创建一个仅实例化一次的类，具有全局静态属性.该属性将用于将信息从一个视图传递到另一个视图.

Basically you create a class that is instanced a single time only, with a global static property. That property will be used to pass info from one view to another.

因此，首先创建一个 Singleton 类(作为一个简单的 Swift 文件)并定义一个静态实例，如下所示:

So, first create a Singleton class (as a simple Swift file) and define a static instance, like this:

class Singleton {

      static let instance = Singleton()

      private init() {

      }
}

现在，创建并初始化要在视图之间共享的变量，例如字符串 name:

Now, create and initialize the variable you want to share between views, for example the string name:

class Singleton {

      static let instance = Singleton()

      private init() {

      }

      var name = ""

}

现在，在您的代码中，将 users.Name 属性赋予它:

Now, in your code, attribute users.Name to it:

                do{
                    let users = try JSONDecoder().decode(User.self, from: data)
                    print("Response data Name: \n \(users.Name)")

                    Singleton.instance.name = users.Name

                    if !(data.isEmpty) {
                        self.signedIn = true
                    }

                }catch let jsonErr{
                    print(jsonErr)
                }

现在，要在另一个视图中访问此信息，只需使用 Singleton.instance.name.

Now, to access this info in another view, just use Singleton.instance.name.

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