import Foundation
class MyClass: NSObject {

    var myVar1 : AnyObject!

    // ...
}

let myClass: MyClass = MyClass()
let hasClassMemberMyVar1 = myClass.respondsToSelector(Selector("setMyVar1:")) // true
let hasClassMemberMyVar2 = myClass.respondsToSelector(Selector("setMyVar2:")) // false

它对我有用......

it works for me ...

更新，基于 OP 注释

UPDATE, based on OP notes

import Foundation
class C:NSObject {}
class MyClass: NSObject {
    var myVar1 : C? // Objective-C representable
    var i: Int = 0  // Objective-C representable
    var j: Int? = 10
}

let myClass: MyClass = MyClass()
let hasClassMemberMyVar1 = myClass.respondsToSelector(Selector("setMyVar1:")) // true
let hasClassMemberMyVar2 = myClass.respondsToSelector(Selector("setMyVar2:")) // false
let hasClassMemberI = myClass.respondsToSelector(Selector("setI:")) // true
let hasClassMemberJ = myClass.respondsToSelector(Selector("setJ:")) // false, because Optional<Int> is not representable in Objective-C !!!
print(myClass.i.dynamicType, myClass.j.dynamicType) // Int Optional<Int>

仅具有类类型属性

import Foundation
class C:NSObject {}
class C1 {}
class MyClass: NSObject {
    var c : C?
    var cO1: C = C()
    var cO2: C!
    var c1: C1 = C1()
    var c2: C1?
    var c3: C1!
}

let myClass: MyClass = MyClass()
let hasClassMemberC = myClass.respondsToSelector(Selector("setC:")) // true
let hasClassMemberCO1 = myClass.respondsToSelector(Selector("setCO1:")) // true
let hasClassMemberCO2 = myClass.respondsToSelector(Selector("setCO2:")) // true
let hasClassMemberC1 = myClass.respondsToSelector(Selector("setC1:")) // false, class C1 is not Objective-C representable ...
let hasClassMemberC2 = myClass.respondsToSelector(Selector("setC2:")) // false, Optional<C1> is not Objective-C representable ...
let hasClassMemberC3 = myClass.respondsToSelector(Selector("setC3:")) // false, ImplicitlyUnwrappedOptional<C1> is not Objective-C representable ...