Swift 3.0 Object’s class checking isKindOfClass

We frequently need this type checking when getting response from the server. Where we need to check the type of objects based on which we need to parse the response.

In this post let’s see how can we check this using Swift 3.0.

In Objective-C/ Swift, It’s NSObject’s method isKindOfClass which helps for type checking.

I have two types of classes.

Employee

  

    var firstName: String?

    var lastName: String?

    var email: String?

    var gender: String?

    var isMarried: Bool = false

    

    init(firstName: String, lastName: String, email: String, gender: String, 

                                                                              isMarried: Bool) {

        self.firstName = firstName

        self.lastName = lastName

        self.email = email

        self.gender = gender

        self.isMarried = isMarried

    }

Employer

  

    var firstName: String?

    var lastName: String?

    var email: String?

    var gender: String?

    var isMarried: Bool = false

    var employeesCount:Int = 0    

    init(firstName: String, lastName: String, email: String, gender: String, 

                                                    isMarried: Bool, employeesCount:Int) 

    {

        self.firstName = firstName

        self.lastName = lastName

        self.email = email

        self.gender = gender

        self.isMarried = isMarried

        self.employeesCount = employeesCount

    }

Only Employer will have employees count.

Let’s take an array of Employee and Employer objects.

  

           let employee1 = Employee.init(firstName: "employee-1", 

                                                          lastName: "lastname-1", 

                                                          email: "employee1@gmail.com", 

                                                          gender: "Male", 

                                                          isMarried: true)

           let employee2 = Employee.init(firstName: "employee-2", 
                                                          lastName: "lastname-2", 
                                                          email: "employee2@gmail.com", 
                                                          gender: "Male", 
                                                          isMarried: true)

           let employer1 =  Employer.init(firstName: "XXX", 
                                                          lastName: "YYY", 
                                                          email: "xyz@gmail.com", 
                                                          gender: "Male", 
                                                          isMarried: true,
                                                          employeesCount: 32)

        

        

           let employees = [employee1, employee2, employer1]

I have taken 2 Employee objects and 1 Employer object and added them to an array. This is kind of Any Array in Swift.

Now the task is, We need to loop through this array and print employee count if the object is an Employer. Let’s see how this can be using Swift 3.0

  

        let employees = [employee1, employee2, employer1]

        

        for employee in employees {

            

            if (employee.isKind(of: Employer.self)) {

                

                let employeesCount = (employee as! Employer).employeesCount

                

                print("employeesCount : \(employeesCount)")   // employeesCount : 32

                

            }

            

        }

Hope this post is useful. Feel free to comment incase of any queries.