Not able to show the alert if user denied the camera access - ios

Question

If user dennied the camera access, i am showing one alert with cancel and setting button to show it. But the code is not working.
#IBAction func ProfileImageButton(_ sender: UIButton) {
print("profile image Button is pressed")
let imagePickerController = UIImagePickerController()
imagePickerController.delegate = self
profileimgbool = true
let actionSheet = UIAlertController(title: "Photo Source", message: "choose a Source", preferredStyle: .actionSheet)
actionSheet.addAction(UIAlertAction(title: "Camera", style: .default, handler: {(action:UIAlertAction) in imagePickerController.sourceType = .camera
self.present(imagePickerController, animated: true, completion: nil)
}))
actionSheet.addAction(UIAlertAction(title: "Photo Library", style: .default, handler: {(action:UIAlertAction) in imagePickerController.sourceType = .photoLibrary
self.present(imagePickerController, animated: true, completion: nil)}))
actionSheet.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
self.present(actionSheet, animated: true, completion: nil)
}
func checkCameraPermission() {
let cameraMediaType = AVMediaType.video
AVCaptureDevice.requestAccess(for: cameraMediaType) { granted in
if granted {
//Do operation
print("Granted access for camera")
// self.setCamera()
} else {
self.noCameraFound()
print("Denied access for camera ")
}
}
}
func noCameraFound(){
let alert = UIAlertController(title: "CallDoc", message: "Please allow camera access in phone settings", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Back", style: UIAlertActionStyle.cancel, handler: {(action:UIAlertAction) in
}));
alert.addAction(UIAlertAction(title: "Open setting", style: UIAlertActionStyle.default, handler: {(action:UIAlertAction) in
UIApplication.shared.open(NSURL(string:UIApplicationOpenSettingsURLString)! as URL, options: [:], completionHandler: nil)
}));
self.present(alert, animated: true, completion: nil)
}
in my above code my method was checkCameraPermission where i will call this to show alert. I needs to show when user click camera, and when if user denied that black screen will show instead of camera. There i need to show that alert pop up.
Where i can call this checkCameraPermission method to show my popup ?.
Any idea ?

Answer 1

for reference purpose I taken the answer from this tutorial.
step 1
add the avfoundation framework in your project
import AVFoundation
step 2
dont forget to Set Camera Usage Description in Info.plist
When you request permission to use the device’s camera, a short message will appear in the default iOS system dialog. You customize this message by adding the Privacy - Camera Usage Description key to your Info.plist file.
step 3
on your image profile change button action verify the permission, etc.
#IBAction func ProfileImageButton(_ sender: UIButton) {
let cameraAuthorizationStatus = AVCaptureDevice.authorizationStatus(for: .video)
switch cameraAuthorizationStatus {
case .notDetermined: requestCameraPermission()
case .authorized: presentCamera()
case .restricted, .denied: alertCameraAccessNeeded()
}
}
based on the above action the condition will satisfy,
If the user has never responded to a request to access his/her camera, you need to prompt with the iOS system alert to request permission:
func requestCameraPermission() {
AVCaptureDevice.requestAccess(for: .video, completionHandler: {accessGranted in
guard accessGranted == true else { return }
self.presentCamera()
})
}
there after the camera access will continue
func presentCamera() {
let photoPicker = UIImagePickerController()
photoPicker.sourceType = .camera
photoPicker.delegate = self as? UIImagePickerControllerDelegate & UINavigationControllerDelegate
self.present(photoPicker, animated: true, completion: nil)
}
To use the image that the camera captured, you need to set up your view controller to adhere to and implement couple of delegate protocols:
class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
// ...
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
let photo = info[UIImagePickerControllerOriginalImage] as! UIImage
// do something with the photo... set to UIImageView, save it, etc.
dismiss(animated: true, completion: nil)
}
If camera access has been denied or restricted, you can alert the user and direct them to the Settings app to make the appropriate permissions adjustment:
func alertCameraAccessNeeded() {
let settingsAppURL = URL(string: UIApplicationOpenSettingsURLString)!
let alert = UIAlertController(
title: "Need Camera Access",
message: "Camera access is required to make full use of this app.",
preferredStyle: UIAlertControllerStyle.alert
)
alert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: nil))
alert.addAction(UIAlertAction(title: "Allow Camera", style: .cancel, handler: { (alert) -> Void in
UIApplication.shared.open(settingsAppURL, options: [:], completionHandler: nil)
}))
present(alert, animated: true, completion: nil)
}