Open up your terminal and navigate to your Xcode project directory.

If you haven't already, initialize CocoaPods by running pod init.

Open the Podfile by running open Podfile.

Add these dependencies to the Podfile:

```ruby
pod 'Firebase/Core'
pod 'Firebase/MLVision'
```

Save the Podfile and run pod install in the terminal.

Open the .xcworkspace file to work with your project in Xcode.

Open AppDelegate.swift.

Import Firebase at the top:

```swift
import Firebase
```

Configure Firebase in the application(_:didFinishLaunchingWithOptions:) method:

```swift
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
FirebaseApp.configure()
return true
}
```

Import Firebase ML Kit at the top of your ViewController:

```swift
import FirebaseMLVision
```

Create a function to perform image labeling:

```swift
func labelImage(_ image: UIImage) {
// Create a vision image from the UIImage
let visionImage = VisionImage(image: image)

// Get an instance of the labeler
let labeler = Vision.vision().onDeviceImageLabeler()

// Process the image
labeler.process(visionImage) { labels, error in
guard error == nil, let labels = labels else {
// Handle error
print("Image labeling failed with error: (error?.localizedDescription ?? "")")
return
}

// Process labels
for label in labels {
print("Label: (label.text), Confidence: (label.confidence ?? 0)")
}
}
}
```

Add an image picker to capture or select an image. Add the following code in your ViewController:

```swift
import UIKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
}

@IBAction func selectImage(_ sender: UIButton) {
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .photoLibrary
present(imagePicker, animated: true, completion: nil)
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
picker.dismiss(animated: true, completion: nil)
if let image = info[.originalImage] as? UIImage {
labelImage(image)
}
}
}
```

Add a button in your storyboard and connect it to the selectImage action to trigger the image picker.