Swift：尝试创建通用类型的初始值设定项

Question

I'm banging my head over here

. I'm trying to solve this "easy" to understand issue. I have an API Endpoint which i'm sending to request from many different classes. Let's assume I have a Tweet class and User class.

class Tweet {

    var id: String!
    var description: String!

    required init() { }

 }

class User {

    var id: String!
    var username: String!
    var likes : Int!

    required init() { }

 }

Now, Depending on the Class request origin, I'll get a respond with an Array that each element holds the exact same properties as the source Class as JSON . Sample request from Tweet Class :

  "data":
  [{
     {
     "id": "492",
     "description": "HELP!"
     },
     {
     "id": "574",
     "description": "ME!"
     }
   ]}

Now, I'm trying to create a Generic Method which automatically parse those into an Array with objects from the passes Class type. This is what i've tried

func sendRequest<T>(resource: T.Type,withProperyList propList : [String], completion: @escaping ([T]?) -> ()) { 


// Create NSURLSession request, fetching data.. converting to json..

guard let mainArray = json["data"] as? NSArray else { return }

for element in mainArray  {

      let tweet = T() // **Error here**

 }

Error: ** 'T' cannot be constructed because it has no accessible initializers

How can I access my Generic Type Class in a generic way? Meaning that i'll pass the Class type and be able to apply it to 'T'. I've tried passing it theu the input parameters but it won't help. I just can't figure it out. Any ideas?

Answer 1

代替T() ，试试看。

let tweet = resource.init()