Question

这里有些困境。我的方法GetData（）将数组存储在jsondata1中。我将如何在另一个类中使用该数组？我已经将其设置为Data的子类。谢谢！

class Data {

    let parameters = ["test": ViewController().myinfo]


    func GetData() {  
        AF.request("my url", parameters: parameters).responseDecodable(of: Array<JsonData>.self ) { (response) in
            let jsondata1 = response.value
            // debugPrint(response)
            print(jsondata1)
        }
    }
}



class Testing : Data {

    func AnnualTesting() {
    
        //How would I reference jsondata1 here?
        debugPrint(jsondata1)
    }
}

Answer 1

您对jsondata1的声明在某个块的范围内。从外面看不到。

您必须在类的接口中声明它，就像您对变量“参数”所做的一样。

通常，如果在接口中声明了变量，则可以从另一个类访问变量。可以将其声明为实例变量或静态（类）变量。而且，您应该具有用于访问实例var的类的实例，并且不应具有用于访问class / static变量的实例。

或者像您一样，通过继承。

Answer 2

几件事...看评论。

class Data {

    // This kind of thing is the source of more bugs than I can count.
    // Are you *sure* you want to create a brand new ViewController that's connected to nothing?
    let parameters = ["test": ViewController().myinfo]

    // Declare an instance variable so it's visible to the subclass
    // (Not sure what data type you want to use here.  I'm calling it a String for convenience.)
    var jsondata1: String?  

    func GetData() {
        AF.request("my url", parameters: parameters).responseDecodable(of: Array<JsonData>.self ) { (response) in

            // Note that this is filled in asynchronously,
            // so isn't available as soon as the function is called.
            // Currently you have no way of knowing in other code when the result *is* available.
            self.jsondata1 = response.value

           // debugPrint(response)
            print(jsondata1)
        }
    }

}

class Testing : Data {

    func AnnualTesting() {
        
        //How would I reference jsondata1 here?
        debugPrint(jsondata1 ?? "Nothing to see here")
    }

}

如何从另一个类Swift使用数组

2 个答案: