class A: NSObject {
let value: Int
init(value: Int) {
self.value = value
}
}
class B: NSObject {
let value: Int
init(value: Int) {
self.value = value
}
}
class Main: NSObject {
@objc func printValue(_ instanceA: A) {
print("Value: (instanceA.value)")
print("instanceA is A? (instanceA is A)")
print("instanceA is kind of A? (instanceA.isKind(of: A.self))")
}
}
Main().perform(NSSelectorFromString("printValue:"), with: B(value: 2))
如果我们运行上面的代码,我们可以得到以下结果:
Value: 2
instanceA is A? true
instanceA is kind of A? false
我们可以看到instanceA is A
和instanceA.isKind(of: A.self)
不同,你知道为什么吗?
暂无答案!
目前还没有任何答案,快来回答吧!