How to convert a Swift array to NSArray?

Question

I have the following class

class Game {
    // An array of player objects
    private var playerList: [Player]?
}

I want to enumerate through the playerList; this requires to import Foundation then cast it to a NSArray; but its always complaining that it can't convert it

func hasAchievedGoal() {
    if let list:NSArray = playerList {

    }

    for (index,element) in list.enumerate() {
        print("Item \(index): \(element)")
    }
}

Cannot convert value of type '[Player]?' to specified type 'NSArray?'

I've tried the below, but that isn't working:

if let list:NSArray = playerList as NSArray

score 8 · Accepted Answer · 2016-03-05 08:02:00Z

8

You don't need to cast to NSArray to enumerate:

if let list = playerList {
  for (index,value) in list.enumerate() {
    // your code here
  }
}

As for your cast you should do it like this:

if let playerList = playerList,
    list = playerList as? NSArray {
  // use the NSArray list here
}

edited Mar 5, 2016 at 8:02

answered Mar 5, 2016 at 7:52

user887210

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2 Comments

zardon Over a year ago

If I do if let list = self.playerOrderList as? NSArray { it says; Cast from '[Player]?' to unrelated type 'NSArray' always fails

user887210 Over a year ago

Yeah I forgot to unwrap the optional first, typing this on my phone and couldn't test the code. Updating the answer.

pkamb · Accepted Answer · 2024-05-16 02:06:22Z

4

You can't convert an optional array to NSArray, you have to first unwrap the array. You can do this via test, like this:

if let playerList = playerList {
    let list:NSArray = playerList
}

edited May 16, 2024 at 2:06

pkamb

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answered Mar 5, 2016 at 7:55

sschale

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