ios - 判断一个对象是否是另一个类的子类

Question

我有一些实验代码。但最终目标是 findType() 如果 obj 的类型为“parent”，则应打印/返回 true

class Car {}
class RacingCar:Car {}
let raceCar = RacingCar()

func findType(_ obj: Any, parent: AnyClass) {
    print(type(of: obj)) // RacingCar
    print(parent) // Car
    print(type(of: obj) == parent) // false
//  if obj is parent {
//      print("true")
//  }
}

findType(raceCar, parent: Car.self)

如何实现？

---

有了模板建议，

    func isTypeOf<T>(_ obj: Any, parent: T.Type) {
    if obj is T { // true
        print("true")
    }
}

isTypeOf(raceCar, parent: Car.self) // worked

func getType(parentClass: AnyClass){
    isTypeOf(raceCar, parent: parentClass)
}
getType(parentClass: Car.self) // this dont work.

Answer 1

您可以使用泛型来获取类型:

func findType<T>(_ obj: Any, parent: T.Type) {
    print(type(of: obj)) // RacingCar
    print(parent) // Car
    print(type(of: obj) == parent) // false
    if obj is T { // true
        print("true")
    }
}

findType(raceCar, parent: Car.self)

或者，你可以直接传入一个parent对象，那么它看起来像这样:

func findType<T>(_ obj: Any, parent: T) {
    print(type(of: obj)) // RacingCar
    print(type(of: parent)) // Car
    print(type(of: obj) == T.self) // false
    if obj is T {
        print("true")
    }
}

let car = Car()
findType(raceCar, parent: car)