You are trying to cast to a type which is defined by a variable at runtime.
Casting with `as` is done at compile-time. The variable has no defined value at this time.
The compiler cannot infer what the value of a variable is going to be.
It can only infer types by static analysis.
Regards
Johan
···
Is that possible to do dynamic casting?
My code:
importFoundation
letarray = [1,2,3,4,5]
letdictionary:[String:Any] = ["numbers":array]
ifletvalue =dictionary["numbers"] {
lettype = type(of: value)
print(type)// Array<Int>
letnumbers = valueas!Array<Int>// [1, 2, 3, 4, 5]
//let numbers2 = value as! type // error: use of undeclared type 'type'
}
As you can see, the dynamic casting leads an error. Is there a way to do this? Thanks.
Thanks, Jordan. Is there any other way to do that?
Zhaoxin
···
On Thu, Aug 25, 2016 at 6:40 PM, Johan Segerfeldt <Johan.Segerfeldt@fiwe.se> wrote:
Zhaoxin,
You are trying to cast to a type which is defined by a variable at runtime.
Casting with `as` is done at compile-time. The variable has no defined
value at this time.
The compiler cannot infer what the value of a variable is going to be.
It can only infer types by static analysis.
Regards
Johan
> Is that possible to do dynamic casting?
>
> My code:
>
> >
> > importFoundation
> >
> >
> >
> >
> >
> >
> >
> >
> > letarray = [1,2,3,4,5]
> >
> >
> >
> > letdictionary:[String:Any] = ["numbers":array]
> >
> >
> >
> >
> >
> >
> >
> >
> > ifletvalue =dictionary["numbers"] {
> >
> >
> >
> > lettype = type(of: value)
> >
> >
> >
> > print(type)// Array<Int>
> >
> >
> >
> > letnumbers = valueas!Array<Int>// [1, 2, 3, 4, 5]
> >
> >
> >
> > //let numbers2 = value as! type // error: use of undeclared type 'type'
> >
> >
> >
> > }
> >
> >
> As you can see, the dynamic casting leads an error. Is there a way to do
this? Thanks.
>
>
>
>
>
>
> Zhaoxin
>
>
>
>
>
>