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# retrievePreferredCredentials(_:)

Requests Thread credentials for the preferred network.

```
func retrievePreferredCredentials(_ completion: @escaping @Sendable (THCredentials?, (any Error)?) -> Void)
```

```
func preferredCredentials() async throws -> THCredentials
```

## Parameters

`completion`

The completion handler the framework calls when the credentials become available.

## Discussion> Concurrency note: You can call this method from synchronous code using a completion handler, as shown on this page, or you can call it as an asynchronous method that has the following declaration:
> 
> ```swift
> func preferredCredentials() async throws -> THCredentials
> ```
> 
> For information about concurrency and asynchronous code in Swift, see <doc://com.apple.documentation/documentation/Swift/calling-objective-c-apis-asynchronously>.

When you call this method, an alert appears asking for user permission to access
credentials.

Call the method as follows:

```swift
func obtainPreferredCredentials() async -> (cred: THCredentials? , err: Error? ) {
    let client = THClient()
    var credential: THCredentials?
    var err:Error?
    do {
        credential = try await client.preferredCredentials()
    } catch {
        err = error
    }
    return (credential, err)
}
```

---

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