Convert [String: Any] to [String: String] in swift

Question

How to convert a [String: Any] to [String: String] in Swift. I've tried to cast like this, but it didn't help:

for (key, value) in dictionary {
    dictionary[key] = value as! String
}

Answer 1

Here is safe approach, the converted will contain only [String: String], non-string Any will be dropped:

let converted = dictionary.compactMapValues { $0 as? String }

Answer 2

Update: If you need to include the non-string values too as #user has asked in the comments you could use the following approach:

let anyDict = ["String0": "0", "String1": 1] as [String : Any]
let stringDict = anyDict.compactMapValues { "\($0)" }

(Old)Here:

import Foundation

let anyDict = ["String0": "0", "String1": 1] as [String : Any]
var stringDict = [String: String]()

for (key, value) in anyDict {
    if let value = value as? String {
        stringDict[key] = value
    }
}
print(stringDict)

Answer 3

If literally all you want to do is:

Convert [String: Any] to [String: String] in Swift.

And if you're happy to get nothing back if any of the Anys are not Strings, then you can do:

Safe:

if let stringDictionary = dictionary as? [String: String] {
    //Use your new stringDictionary here
}

Unsafe:

let stringDictionary = dictionary as! [String: String]