On Nov 28, 2015, at 03:51 , Roland King <[email protected]> wrote:
>
> private var myViews : Array<UIView,MasterControllable>
> // nope
> private var myViews : Array<T:UIView where T:MasterControllable> // nope
The problem is that you’re defining a variable. It can’t be generic — that
would imply a different variable for each specialization. It can’t be
UIView+MasterControllable (in some syntax), because no such *single* type
exists. You could do something like this (which compiles in a playground):
> protocol MasterControllable
> {
> func implementMe ()
> var view: UIView { get }
> }
>
> extension MasterControllable
> {
> var view: UIView { return self as! UIView }
> }
>
> public class MyView1 : UIView, MasterControllable
> {
> func implementMe () {}
> }
>
> public class MyView2 : UIView, MasterControllable
> {
> func implementMe () {}
> }
>
> private var myViews : [MasterControllable] = [MyView1 (frame: .zero), MyView2
> (frame: .zero)]
That means you’d use 'myViews [i]’ to get to the MasterControllable methods and
‘myViews [i].view’ to get to the view methods.
What you’re trying to do sounds reasonable, though. If there was syntax like
‘class <SomeClass, SomeProtocol>’ to go along with ‘protocol <SomeProtocol,
OtherProtocol>’, then you could declare an 'Array<class <UIView,
MasterControllable>>’. However, I don’t know exactly what kind of type this
would be — not exactly a class *or* a protocol.
Declaring a parent class that’s a UIView subclass and implements the protocol
as placeholder methods isn’t a stupid idea. (Or, better still, implements them
as defaults in a protocol extension.) It’s just grunt work like we’ve been
doing for years.
You should ask this question in the Swift developer forum area. There are
smarter people there who love solving this kind of thing.
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