How to take multiple photos in sequence (delay 1 each) using Swift on iOS8.1?

Question

I try to take several photos after one user clicks on the camera’s preview, so I can submit them, and the user can choose the one that was selected best or use everything in the film-strip mode. Expected user interface: “I open the camera, take a picture, and then see 5 pictures taken a second time. I don’t need to click the“ take picture ”button 5 times, one is enough to start the sequence.”

I am new to iOS and Swift, and I base my work on Quick Recipes ( https://www.safaribooksonline.com/library/view/ios-8-swift/9781491908969/ ).

Source code for taking one photo:

controller = UIImagePickerController() if let theController = controller{ theController.sourceType = .Camera theController.mediaTypes = [kUTTypeImage as NSString] theController.allowsEditing = true theController.delegate = self presentViewController(theController, animated: true, completion: nil) } 

plus appropriate image processing (via func imagePickerController). I tried playing with the control object above, but unfortunately I couldn’t :( I believe that this is not the way I can find, but I struggle to find the right one. Any help would be appreciated.

Answer 1

I do not know if there is a mode for this behavior in the UIImagePickerController . If I were you, I would use AVFoundation to implement this.

 import UIKit import AVFoundation class ViewController: UIViewController { var connection: AVCaptureConnection! var output: AVCaptureStillImageOutput! var videoPreviewLayer: AVCaptureVideoPreviewLayer! @IBOutlet var videPreviewView: UIView! override func viewDidLoad() { super.viewDidLoad() self.createCamera() } override func viewDidLayoutSubviews() { super.viewDidLayoutSubviews() self.videoPreviewLayer.bounds = self.videPreviewView.bounds self.videoPreviewLayer.position = CGPoint(x: CGRectGetMidX(self.videPreviewView.bounds), y: CGRectGetMidY(self.videPreviewView.bounds)) } func createCamera() { let captureSession = AVCaptureSession() if captureSession.canSetSessionPreset(AVCaptureSessionPresetHigh) { captureSession.sessionPreset = AVCaptureSessionPresetHigh } else { println("Error: Couldn't set preset = \(AVCaptureSessionPresetHigh)") return } let cameraDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo) var error: NSError? let inputDevice = AVCaptureDeviceInput.deviceInputWithDevice(cameraDevice, error: &error) as AVCaptureDeviceInput if let error = error { println("Error: \(error)") return } if captureSession.canAddInput(inputDevice) { captureSession.addInput(inputDevice) } else { println("Error: Couldn't add input device") return } let imageOutput = AVCaptureStillImageOutput() if captureSession.canAddOutput(imageOutput) { captureSession.addOutput(imageOutput) } else { println("Error: Couldn't add output") return } // Store imageOutput. We will need it to take photo self.output = imageOutput let connection = imageOutput.connections.first as AVCaptureConnection! // Store this connection in property. We will need it when we take image. self.connection = connection connection.videoOrientation = AVCaptureVideoOrientation.Portrait captureSession.startRunning() // This will preview the camera let videoLayer = AVCaptureVideoPreviewLayer(session: captureSession) videoLayer.videoGravity = AVLayerVideoGravityResizeAspectFill videoLayer.contentsScale = UIScreen.mainScreen().scale self.videPreviewView.layer.addSublayer(videoLayer) // Store this layer instance in property. We will place it into a view self.videoPreviewLayer = videoLayer } func takePhoto(completion: (UIImage?, NSError?) -> Void) { self.output.captureStillImageAsynchronouslyFromConnection(self.connection) { buffer, error in if let error = error { completion(nil, error) } else { let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(buffer) let image = UIImage(data: imageData, scale: UIScreen.mainScreen().scale) completion(image, nil) } } } } 

Now you need to create an action that calls takePhoto 3 times. You can use NSTimer for this.