Accessing the camera and photo library in swift 4

问题

I'm trying to access both the camera and photo library in swift4 using the following code

let imagePickerController = UIImagePickerController()
    imagePickerController.delegate = self
    let alert = UIAlertController(title: "", message: "", preferredStyle: .actionSheet)
    alert.addAction(UIAlertAction(title: "Camera", style: .default, handler: {(action: UIAlertAction) in
        imagePickerController.sourceType = .camera
        print(1)
    }))
    alert.addAction(UIAlertAction(title: "Photo Album", style: .default, handler: {(action: UIAlertAction) in
        imagePickerController.sourceType = .photoLibrary
    }))
    alert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: nil))
    self.present(alert, animated: true, completion: nil)

but it's not working. I'm not get an access authorization request even though I made sure that the plist has the camera and photo library authorization. I manipulate the code a bit to the following

AVCaptureDevice.requestAccess(for: AVMediaType.video) { response in
    }
    let photos = PHPhotoLibrary.authorizationStatus()
    if photos == .notDetermined {
        PHPhotoLibrary.requestAuthorization({status in
        })
    }

    let imagePickerController = UIImagePickerController()
    imagePickerController.delegate = self
    let alert = UIAlertController(title: "", message: "", preferredStyle: .actionSheet)
    alert.addAction(UIAlertAction(title: "Camera", style: .default, handler: {(action: UIAlertAction) in
        imagePickerController.sourceType = .camera
        print(1)
    }))
    alert.addAction(UIAlertAction(title: "Photo Album", style: .default, handler: {(action: UIAlertAction) in
        imagePickerController.sourceType = .photoLibrary
    }))
    alert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: nil))
    self.present(alert, animated: true, completion: nil)

Now I am getting the authorization request for both cameras and photo library and I can see the AlertView but when I press camera or Photo Album as shown in the picture nothing happens.

I tried on a device and simulator for the camera.

回答1:

Mistake: You need to present the imagePickerViewController. Here I am giving the modified code to resolve your problem. I have added some check also.

 //Show alert
func showAlert() {

    let alert = UIAlertController(title: "", message: "", preferredStyle: .actionSheet)
    alert.addAction(UIAlertAction(title: "Camera", style: .default, handler: {(action: UIAlertAction) in
        self.getImage(fromSourceType: .camera)
    }))
    alert.addAction(UIAlertAction(title: "Photo Album", style: .default, handler: {(action: UIAlertAction) in
        self.getImage(fromSourceType: .photoLibrary)
    }))
    alert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: nil))
    self.present(alert, animated: true, completion: nil)
}

//get image from source type
func getImage(fromSourceType sourceType: UIImagePickerControllerSourceType) {

    //Check is source type available
    if UIImagePickerController.isSourceTypeAvailable(sourceType) {

        let imagePickerController = UIImagePickerController()
        imagePickerController.delegate = self
        imagePickerController.sourceType = sourceType
        self.present(imagePickerController, animated: true, completion: nil)
    }
}

Note: Don't forget to add the privacy settings in info.plist

Privacy - Camera Usage Description

Privacy - Photo Library Usage Description

回答2:

First of all, you need to import these libraries:

import Photos
import UIKit

 @IBOutlet weak var loadPhoto: UIButton!

And you need setup delegates:

class YourClass: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UNUserNotificationCenterDelegate 

func displayUploadImageDialog(btnSelected: UIButton) {
    let picker = UIImagePickerController()
    picker.delegate = self
    picker.allowsEditing = true
    let alertController = UIAlertController(title: "", message: "Upload profile photo?".localized(), preferredStyle: .actionSheet)
    let cancelAction = UIAlertAction(title: NSLocalizedString("Cancel", comment: "Cancel action"), style: .cancel, handler: {(_ action: UIAlertAction) -> Void in
        alertController.dismiss(animated: true) {() -> Void in }
    })
    alertController.addAction(cancelAction)
    let cameraRollAction = UIAlertAction(title: NSLocalizedString("Open library".localized(), comment: "Open library action"), style: .default, handler: {(_ action: UIAlertAction) -> Void in
        if UI_USER_INTERFACE_IDIOM() == .pad {
            OperationQueue.main.addOperation({() -> Void in
                picker.sourceType = .photoLibrary
                self.present(picker, animated: true) {() -> Void in }
            })
        }
        else {
            picker.sourceType = .photoLibrary
            self.present(picker, animated: true) {() -> Void in }
        }
    })
    alertController.addAction(cameraRollAction)
    alertController.view.tintColor = .black
    present(alertController, animated: true) {() -> Void in }
}

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    let image = info[UIImagePickerControllerOriginalImage] as! UIImage
    profileImage.image = image
    let imageData = UIImageJPEGRepresentation(image, 0.05)
    self.dismiss(animated: true, completion: nil)
}

func checkPermission() {
    let authStatus = AVCaptureDevice.authorizationStatus(for: AVMediaType.video)
    switch authStatus {
    case .authorized:
        self.displayUploadImageDialog(btnSelected: self.loadPhoto)
    case .denied:
        print("Error")
    default:
        break
    }
}

func imagePickerControllerDidCancel(picker: UIImagePickerController) {
    self.dismiss(animated: true, completion: nil)
}

func checkLibrary() {
    let photos = PHPhotoLibrary.authorizationStatus()
    if photos == .authorized {
        switch photos {
        case .authorized:
            self.displayUploadImageDialog(btnSelected: self.loadPhoto)
        case .denied:
            print("Error")
        default:
            break
        }
    }
}

Setup action for button:

@IBAction func loadPhotoTapped(_ sender: UIButton) {
    let photos = PHPhotoLibrary.authorizationStatus()
    if photos == .notDetermined {
        PHPhotoLibrary.requestAuthorization({status in
            if status == .authorized{
                print("OKAY")
            } else {
                print("NOTOKAY")
            }
        })
    }
    checkLibrary()
    checkPermission()
}

At the Info.plist setup the permissions: