How to convert NSArray into Swift Array in swift 3

Question

I have two array

var arr1 = [NSArray]()
var arr2 = [String]()

And I want to convert NSArray into String Array I am using

arr2 = arr1 as! [String]

But it giving me error :-

'NSString' is not a subtype of 'NSArray'

Is there any other method to convert?

arr1 is Array<NSArray> (swift array of NSArray) , not NSArray — Bryan Chen
– Bryan Chen, Commented Nov 17, 2016 at 4:34
arr1 is an array of arrays, not an array of strings. As an example, if the first element of arr1 contains an NSArray of [1, 2] and the second element is ["abc", "def"]. What do you want the string representation of this to be? — Michael
– Michael, Commented Nov 17, 2016 at 4:40

Patrick Jackson · Accepted Answer · 2019-08-13 17:13:05Z

19

var arr1 = [NSArray]()

is a swift array of NSArray. You are using wrong syntax for NSArray

In order to convert NSArray to swift Array

Use the proper syntax:

var arr1 = NSArray(objects: "a","b","c")

var objCArray = NSMutableArray(array: arr1)

if let swiftArray = objCArray as NSArray as? [String] {

    // Use swiftArray here
    print(swiftArray)
}

It will print

["a", "b", "c"]

Another way

let swiftArray: [String] = objCArray.compactMap({ $0 as? String })

no forced casting required.

edited Aug 13, 2019 at 17:13

Patrick Jackson

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answered Nov 17, 2016 at 4:42

Rajan Maheshwari

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1 Comment

William Hu Over a year ago

No need NSMutableArray, just if let ar = arr1 as? [String] { should be enough.

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