How to fix AVCapturevideopreviewlayer being smaller than actual camera view - ios

Question

I'm working on an app that periodically takes pictures as part of a research job but I'm new to OOP and swift and am a little confused on what can cause this issue. I think it's because the UIView's size is smaller than the camera view size and it's getting cut out when displaying and I'm not sure how to program it to adapt to the UIView's dimensions. Here's my code:
Video Preview Captured image
import UIKit
import AVFoundation
class SecondViewController: UIViewController {
//Creates session between camera input and data output
let session = AVCaptureSession()
var camera : AVCaptureDevice?
var cameraPreviewLayer : AVCaptureVideoPreviewLayer?
var cameraCaptureOutput : AVCapturePhotoOutput?
//Connects between this code document and Story Board
#IBOutlet weak var Time: UITextField!
#IBOutlet weak var Start: UIButton!
#IBOutlet weak var CameraView: UIView!
//Misc Variables
var alert: UIAlertController!
var sPhoto : UIImage?
var completionHandler : ((UIImage?) -> Void)?
var timerCount:Bool = false
var timer:Timer = Timer()
override func viewDidLoad() {
initializeCaptureSession()
super.viewDidLoad()
//assigns delegates to self
Time.delegate = self
}
//Brings down Time keypad when any area other than keypad is touched
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
Time.resignFirstResponder()
}
func initializeCaptureSession(){
//Set's sessions presets
session.sessionPreset = AVCaptureSession.Preset.photo
//Initalize Camera
camera = AVCaptureDevice.default(for: AVMediaType.video)
do{
if(camera == nil){
print("No Camera Detected")
}
else{
let cameraCaptureInput = try AVCaptureDeviceInput(device: camera!)
//Set's Camera Output
cameraCaptureOutput = AVCapturePhotoOutput()
session.addInput(cameraCaptureInput)
session.addOutput(cameraCaptureOutput!)
}
} catch{
print(error.localizedDescription)
}
cameraPreviewLayer = AVCaptureVideoPreviewLayer(session: session)
let rootLayer: CALayer = self.CameraView.layer
rootLayer.masksToBounds=false
cameraPreviewLayer?.frame = rootLayer.bounds
rootLayer.addSublayer(self.cameraPreviewLayer!)
cameraPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
session.startRunning()
}
//Function that creates alert that dismisses
func notifyUser(message: String) -> Void
{
let alert = UIAlertController(title: "", message: message, preferredStyle: UIAlertController.Style.alert)
present(alert, animated: true, completion: nil)
DispatchQueue.main.asyncAfter(deadline: .now() + 1) { [unowned self] in
self.dismiss(animated: true)
}
}
#IBAction func StartPressed(_ sender: Any) {
if(Time.text!.isEmpty == true){
notifyUser(message: "Please enter a interval")
}
else{
if(timerCount){
timerCount = false
Start.setTitle("Start", for: .normal)
Start.backgroundColor = UIColor.green
timer.invalidate()
}
else{
timerCount = true
Start.setTitle("Stop", for: .normal)
Start.backgroundColor = UIColor.red
timer = Timer.scheduledTimer(withTimeInterval: Double(Time.text!)!, repeats: true) { [weak self] timer in
self?.takePicture()
}
}
}
}
func takePicture() {
notifyUser(message: "Image Captured")
//This is where you declare settings for the camera
let settings = AVCapturePhotoSettings()
settings.flashMode = .auto
//Actually takes the photo
cameraCaptureOutput?.capturePhoto(with: settings, delegate: self)
}
}
//Extensions
extension SecondViewController : UITextFieldDelegate{
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
textField.resignFirstResponder()
return true
}
}
extension SecondViewController : AVCapturePhotoCaptureDelegate {
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
//If photo failed to be captured
guard error == nil else{
print("Failed to capture photo")
print(error?.localizedDescription as Any)
return
}
//If pixel buffer could not be converted to image data
guard let imageData = photo.fileDataRepresentation() else {
print("Fail to convert image data to UIImage")
return
}
//If the UIImage could not be initalized with image data
guard let capturedImage = UIImage.init(data: imageData, scale: 1.0) else{
print("fail to convert image data to UIImage")
return
}
UIImageWriteToSavedPhotosAlbum(capturedImage, nil, nil, nil)
//displayCapturedPhoto(capturedPhoto: imageToSave)
}
}
I've seen on other posts that the AVLayerVideoGravity.resizeAspectFill has fixed it for some users so any explanations as to why that's not working would be extremely helpful - Much thanks in advance!!!