CFNotificationCenterAddObserver

Question

phatblat OP

Created Jun ’15

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Has anyone figured out how to call CFNotificationCenterAddObserver() from Swift yet?

Session 224 had the following example:

CFNotificationCenterAddObserver(nc,
  nil,
  { _ in self.reloadModel() },
  "com.example.app-model-updated",
  nil,
  .DeliverImmediately)

However, I can't get this to compile. Xcode 6.4b4 gives the following error:

Cannot invoke 'CFNotificationCenterAddObserver' with an argument list of type '(CFNotificationCenter!, nil, (_) -> _, String, nil, CFNotificationSuspensionBehavior)'

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Answer 1

phatblat OP

Jun ’15

Xcode 7 is more helpful and complains about captures:

> A C function pointer cannot be formed from a closure that captures context

I can get it to compile if I change the closure to contain only a call to print(). Kinda misses the point since most of the time you'd want to capture a reference to an object you want to act on.

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