Error: "use of unresolved identifier" - ios

Question

I am making a face detection app. I have written some code for detection but I am getting an error. Kindly suggest me an alternate solution.
Here is the code, and the error is at line number 3.
import UIKit
import CoreImage
class ViewController: UIViewController ,UIAlertViewDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
#IBOutlet var imageView: UIImageView!
#IBAction func Moodify(_ sender: UIButton) {
let picker = UIImagePickerController()
picker.delegate = self
picker.allowsEditing = true
picker.sourceType = .camera
self.present(picker, animated: true, completion: { _ in })
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [AnyHashable: Any]) {
let chosenImage = info[UIImagePickerControllerEditedImage]
self.imageView!.image = chosenImage as? UIImage
picker.dismiss(animated: true, completion: { _ in })
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
picker.dismiss(animated: true, completion: { _ in })
}
}
func detect() {
guard let personciImage = CIImage(image: personPic.image!) else {
return
}
let accuracy = [CIDetectorAccuracy: CIDetectorAccuracyHigh]
let faceDetector = CIDetector(ofType: CIDetectorTypeFace, context: nil, options: accuracy)
let faces = faceDetector.featuresInImage(personciImage)
for face in faces as! [CIFaceFeature] {
print("Found bounds are \(face.bounds)")
let faceBox = UIView(frame: face.bounds)
faceBox.layer.borderWidth = 3
faceBox.layer.borderColor = UIColor.redColor().CGColor
faceBox.backgroundColor = UIColor.clearColor()
personPic.addSubview(faceBox)
if face.hasLeftEyePosition {
print("Left eye bounds are \(face.leftEyePosition)")
}
if face.hasRightEyePosition {
print("Right eye bounds are \(face.rightEyePosition)")
}
}
}
override func viewDidLoad() {
let alert = UIAlertController(title: "Error", message: "Device has no camera", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)
/* if !UIImagePickerController.isSourceTypeAvailable(.camera) {
let myAlertView = UIAlertView (title: "Error", message: "Device has no camera", delegate: nil, cancelButtonTitle: "OK", otherButtonTitles: "")
myAlertView.show()
} */
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

You need to declare it and connect to a UIImageView in storyboard.
#IBOutlet weak var personPic: UIImageView!
This is basic of programming. How can you use something that you haven't declared, right? Ok good luck in your project.