Swift 4 filter closure

Asked Aug 25 '17 at 10:46

Active Aug 25 '17 at 11:14

Viewed 209 times

I don't understand the new closure syntax for swift 4.

let asset = self.images[(indexPath as NSIndexPath).item]

let selectedAsset = selectedAssets.enumerated().filter ({ ($0, $1) == asset }).first

This is my code however I'm getting the following error:

Closure tuple parameter '(offset: Int, element: PHAsset)' does not support destructuring with implicit parameters

Could someone please correct my syntax?

EDIT:

I've also tried this

typealias phass = (offset: Int, element: PHAsset)
let selectedAsset = selectedAssets.enumerated().filter ({ phass.element == asset }).first

But it says

Contextual type for closure argument list expects 1 argument, which cannot be implicitly ignored

edited Aug 25 '17 at 11:14

asked Aug 25 '17 at 10:46

Rick Harrison

@Moritz do you know the answer to this? – Rick Harrison Aug 25 '17 at 10:56
Saw that before – Rick Harrison Aug 25 '17 at 11:05
I am fairly sure that it is the same issue. In your case something like `{ $0.element == asset }` should work. – Martin R Aug 25 '17 at 11:26
What is the type of `asset`? It is `PHAsset`? By the way, you can use `.first { ... }` instead of `filter { }.first`. – Sulthan Aug 25 '17 at 11:27
@Sulthan Yeah PHAsset – Rick Harrison Aug 25 '17 at 11:49
@MartinR yep that fixed it, thankyou very much! – Rick Harrison Aug 25 '17 at 11:51

0 Answers0