xcode - 实例成员不能用于类型

Question

@IBAction func saveDetails(sender: AnyObject) {
        Person.firstName = firstNameTF.text
        Person.lastName = lastNameTF.text
}

上面是我试图实现的函数，下面是我试图创建实例并将文本字段中的数据存储在...中的类...我收到错误消息“实例成员“firstName”不能用于 Person 类型”。我几乎可以肯定我的类(class)已正确设置和初始化，所以我看不出问题出在哪里？

class Person {
    var firstName : String = ""
    var middleName : String? = nil
    var lastName : String = ""
    var yearOfBirth : Int? = nil
    var age : Int! {
        get {
            guard let _ = yearOfBirth else {
                return nil
            }
            return currentYear - yearOfBirth!
        }
        set {
            yearOfBirth = currentYear - newValue
        }
    }

    init(firstName: String, lastName: String, yearOfBirth: Int? = nil, middleName: String? = nil){
        self.firstName = firstName
        self.lastName = lastName
        self.yearOfBirth = yearOfBirth
        self.middleName = middleName
    }
    convenience init(firstName: String, lastName: String, age: Int, middleName: String? = nil) {
        self.init(firstName: firstName, lastName: lastName, yearOfBirth: nil, middleName: middleName)
        self.age = age
    }

}

Answer 1

错误消息说您不能调用类(类型)Person 的属性。

使用给定的初始化器创建一个Person instance

@IBAction func saveDetails(sender: AnyObject) {
   let person = Person(firstName:firstNameTF.text, lastName:lastNameTF.text)
   // do something with person
}