Swift: check type of property from object (Reflection)

Question

I want to use reflection to check the property type of a given object at runtime.

I use this code:

//: Playground - noun: a place where people can play import UIKit class Object: NSObject { var type:Int? var name="Apple" var delicious=true } let object = Object() // now check the "type" property println(reflect(object)[1].1.value) // this gives me nil println(reflect(object)[1].1.valueType) // this gives Swift.Optional<Swift.Int> // check for Optional... works fine - Says "Optional" if reflect(object)[1].1.disposition == MirrorDisposition.Optional { println("Optional") } // check for type... does not work, because type is an optional - says: not Int if reflect(object)[1].1.valueType is Int.Type { println("Int") } else { println("no Int") }

As you can see on this code, I can'n check "valueType", because it is an Optional.

But how can I check the type of this "Optional" property?

Thanks, Urkman

You know the type of the type property. It is an Int?. What else could you need to know? — matt
– matt, Commented May 20, 2015 at 15:26
Because, this will be generic, so "Object" is just an example. This could be any Object... — Urkman
– Urkman, Commented May 20, 2015 at 15:35
Right, but what I mean is, Swift doesn't really want you to do this. It doesn't have real reflection, and this is deliberate. — matt
– matt, Commented May 20, 2015 at 15:42

Zell B. · Accepted Answer · 2015-05-20 15:38:35Z

Note that optional Int is a different type from Int so you must check it with Int?.Type

if reflect(object)[1].1.valueType is Int?.Type { println("Int Optional") }

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