编译错误可用于struct的初始化程序

Question

我必须通过读取JSON文件来初始化值，因此编写了可用的initiazer。请查看以下代码并提供建议

struct ViewModel {
    var cards : EmployeeData

    init?() {

        if let path = Bundle.main.path(forResource: "EmployeeData", ofType: "json") {
            do {
                let jsonData = try Data(contentsOf: URL(fileURLWithPath: path), options: .mappedIfSafe)
                let decoder = JSONDecoder()
                self.cards = try decoder.decode(EmployeeData.self, from: jsonData)

            }
            catch {
                print(error.localizedDescription)
                return nil
            }
        }
    }
}


struct EmployeeData : Decodable {
    var employeeCards : [EmployeeCards]

    struct EmployeeCards : Decodable {
        var  title : String
        var description : String
        }
}