How to capture the image using the iOS app

We can take pictures in the iOS app by using AVFoundation, which is a framework in iOS. However, in this tutorial, we will use UIImagePickerControllerDelegate methods. Here, we will build a simple application that will capture the picture using the device camera and set it to the image view. We will not use AVFoundation in this tutorial. Instead of that, we will use UIImagePickerController.

The image picker controller is mainly used to manage the user interactions and deliver the results of the interactions to a delegate object. The role and appearance of an image picker controller depend on the source type we assign to it before we present it.

Create a project in XCode and add the ImageView to the ViewController in the storyboard.

Now, Create the outlet in the ViewController class. We need to ensure that our ViewController class conforms to UIImagePickerControllerDelegate and UINavigationControllerDelegate protocols.

  class ViewController: UIViewController,UIImagePickerControllerDelegate,UINavigationControllerDelegate  

Once we conform our view controller to the above-mentioned protocols, create a @objc type function as openCam(), which will contain the business code to open the camera. The declaration of openCam() is given below.

In the ViewController, create a TapGestureRecognizer inside viewDidLoad() so that once we tap on the ViewController, the camera should open.

  override func viewDidLoad() {          super.viewDidLoad()          // Do any additional setup after loading the view.          let gesture = UITapGestureRecognizer(target: self, action: #selector(openCamera))          self.view.addGestureRecognizer(gesture)        }  

Now, we will define the openCamera function, which will contain the instance of UIImagePickerController. We need to define the properties, for instance, and present the one.

  @objc func openCamera(){           let imgPicker = UIImagePickerController()           imgPicker.delegate = self          imgPicker.sourceType = .camera          imgPicker.allowsEditing = false          imgPicker.showsCameraControls = true         self.present(imgPicker, animated: true, completion: nil)      }  

Once we are done with the above steps, we’ll need to implement the didFinishPickingMediaWithInfo method of UIImagePickerControllerDelegate. We will get the image inside the method which is captured by the user that can be set to image outlet which we have created in step 1.

  func imagePickerController(_ picker: UIImagePickerController,didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey :Any]) {   if let img = info[UIImagePickerController.InfoKey.editedImage] as?   UIImage {  self.imgV.image = img          self.dismiss(animated: true, completion: nil)        }else {     print(“error”)  }     }}  

We need to add the camera usage description key in our info.plist and describe why our application wants to use the camera. Add the following code to the info.plist file.

  <key>NSCameraUsageDescription</key>  <string>This app will use camera to take pictures</string>  

We need to run this app on an actual iOS device since we can’t run the same iOS simulator.

The application code is given below.

  import UIKit    Class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {        @IBOutlet weak var imgView: UIImageView!      override func viewDidLoad() {          super.viewDidLoad()          // Do any additional setup after loading the view.          let gesture = UITapGestureRecognizer(target: self, action: #selector(openCamera))          self.view.addGestureRecognizer(gesture)      }        @objc func openCamera(){           let imgPicker = UIImagePickerController()               imgPicker.delegate = self          imgPicker.sourceType = .camera          imgPicker.allowsEditing = false          imgPicker.showsCameraControls = true         self.present(imgPicker, animated: true, completion: nil)      }          func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {           if let img = info[UIImagePickerController.InfoKey.editedImage] as?    UIImage {          self.imgView.image = img          self.dismiss(animated: true, completion: nil)          } else {          print(“error”)          }          } }  

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