Linux下无法使用Swift的value(forKeyPathkeyPath:String)方法

在Linux下，value(forKeyPath keyPath: String)方法并不可用。可以使用KVC的另一种方式：使用value(forKey key: String)方法来获取对象的属性值。示例如下：

class Person { var name: String var age: Int

init(name: String, age: Int) {
    self.name = name
    self.age = age
}

}

let person = Person(name: "Tom", age: 25) let name = person.value(forKey: "name") as! String print(name) // 输出 Tom

如果需要获取嵌套的属性值，可以使用"."链接keyPath的方式来获取。示例如下：

class Address { var city: String init(city: String) { self.city = city } }

class Company { var name: String var address: Address

init(name: String, address: Address) {
    self.name = name
    self.address = address
}

}

let address = Address(city: "Beijing") let company = Company(name: "Apple", address: address) let cityName = company.value(forKey: "address.city") as! String print(cityName) // 输出 Beijing