我有以下型号:
class BaseClass { ... }
class WeakCollection<T: BaseClass> { ... }
class Person : BaseClass { ... }
class Parent : Person {
var children: [Child]
...
}
class Child : Person {
var parents: WeakCollection<Parent>
...
}
let aChild = Child()
...
我在用这样的反射:
let mirrored_object = Mirror(reflecting: aChild)
for attr in mirrored_object.children {
switch attr.value {
case is Int:
...
case is String:
...
case is WeakCollection<BaseClass>:
...
}
}
问题是如果泛型类型不是
case is WeakCollection<BaseClass>
本身,即如果它是它的一些子类,那么BaseClass
中的检查总是false。如何检查泛型类型? 最佳答案
这样做的一个粗略方法是,使您的“WeakCollection”继承某种协议:
protocol BaseProtocol {}
class WeakCollection<T> : BaseProtocol
然后在你的开关中这样做:
switch attr.value {
case is String:
// This is a string
break
case let optionalObject as Optional<Any>:
if case .some(let complexObject) = optionalObject
{
if (complexObject is BaseProtocol)
{
// This is a "WeakCollection" kind
}
}
break
}
这有点粗糙,但它给出了你想要的输出。
关于swift - Swift:如何在反射中检查泛型?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/42177861/