> On Aug 14, 2015, at 16:07 , Jens Alfke <[email protected]> wrote:
>
>
>> On Aug 14, 2015, at 3:44 PM, Rick Mann <[email protected]> wrote:
>>
>> What is the type of "self" in the initializer closure,
>
> Wow, I didn’t even think you could use ‘self’ in such a context, since you’re
> not inside a method, just a closure. But it looks as though ‘self’ has type
> 'MyDelegate -> () -> MyDelegate’, according to the error message you got. I
> can’t remember the associativity of ‘->’; it seems something like a function
> that takes a MyDelegate and returns a function that returns a MyDelegate?
> Weird.
>
>> and is there a way to refer to the enclosing class instance? I also had
>> trouble locating this in the Swift 2 guide, if it's there at all.
>
> No, I don’t think you can access the instance that the variable is going to
> be assigned to.
I really would've hoped that since the closure is defined within the scope of
an instance of the class, that it would have a self made available to it. I've
seen similar code that used "[unowned self] in" to use a weak reference. Just
like a closure inside a func can reference self, I think this should be treated
as a closure "inside" the var.
>> I can do it with a separate member function and call that in the
>> initializer, but that introduces a lot of boilerplate, as well as creating a
>> method I don't intend to ever be called separately.
>
> Why wouldn’t you just move the body of that closure into your init method?
> Something like
>
> func init() {
> let config =
> NSURLSessionConfiguration.backgroundSessionConfigurationWithIdentifier("myident")
> backgroundSession = NSURLSession(configuration: config,
> delegate: self, delegateQueue: nil)
> }
Well, that makes sense, except I actually want to make that variable lazy.
> (And looking at the code more closely, are you really sure you want to create
> an NSURLSession for every instance of MyDelegate? Usually NSURLSession is a
> singleton, or at most you’d have a handful of them.)
In this case, MyDelegate is a singleton, and a variant of the design has a few
of them that really do want separate sessions.
--
Rick Mann
[email protected]
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