Swift: Segue directly to a view controller from camera/UIImagePickerController - ios

In my app, I want the user to be able to be able to take a picture, be presented with the picture, and by tapping the photo a textfield can be added so that they can write on top of the image. This is exactly the same as the functionality of adding text to pictures in Snapchat.
As far as I can understand, the only way to be presented the image after having taken it and be able to edit it, is to set:
imagePicker.showsCameraControls = false
Make a custom overlay:
#IBAction func takePhoto(sender: UIButton) {
imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType = .Camera
imagePicker.showsCameraControls = false
imagePicker.allowsEditing = true
let overlayView = UIView(frame: CGRectMake(0, self.view.frame.width, self.view.frame.width, self.view.frame.height-self.view.frame.width))
overlayView.backgroundColor = UIColor.blackColor()
overlayView.alpha = 0.5
println(overlayView)
let snapButton = UIView(frame: CGRectMake(150, 160, 80, 80))
snapButton.layer.cornerRadius = 40
snapButton.userInteractionEnabled = true
snapButton.backgroundColor = UIColor.purpleColor()
overlayView.addSubview(snapButton)
overlayView.bringSubviewToFront(snapButton)
let recognizer = UITapGestureRecognizer(target: self, action:Selector("handleSnapTap:"))
recognizer.delegate = self
snapButton.addGestureRecognizer(recognizer)
let cancelButton = UIView(frame: CGRectMake(40, 40, 44, 44))
cancelButton.layer.cornerRadius = 22
cancelButton.userInteractionEnabled = true
cancelButton.backgroundColor = UIColor.redColor()
overlayView.addSubview(cancelButton)
overlayView.bringSubviewToFront(cancelButton)
let cancelRecognizer = UITapGestureRecognizer(target: self, action:Selector("handleCancelTap:"))
cancelRecognizer.delegate = self
cancelButton.addGestureRecognizer(cancelRecognizer)
let changeCameraButton = UIView(frame: CGRectMake(165, 40, 44, 44))
changeCameraButton.layer.cornerRadius = 22
changeCameraButton.userInteractionEnabled = true
changeCameraButton.backgroundColor = UIColor.blueColor()
overlayView.addSubview(changeCameraButton)
overlayView.bringSubviewToFront(changeCameraButton)
let changeCameraRecognizer = UITapGestureRecognizer(target: self, action:Selector("handleChangeCameraTap:"))
changeCameraRecognizer.delegate = self
changeCameraButton.addGestureRecognizer(changeCameraRecognizer)
let flashButton = UIView(frame: CGRectMake(300, 40, 44, 44))
flashButton.layer.cornerRadius = 22
flashButton.userInteractionEnabled = true
flashButton.backgroundColor = UIColor.yellowColor()
overlayView.addSubview(flashButton)
overlayView.bringSubviewToFront(flashButton)
let flashRecognizer = UITapGestureRecognizer(target: self, action:Selector("handleFlashTap:"))
flashRecognizer.delegate = self
flashButton.addGestureRecognizer(flashRecognizer)
imagePicker.cameraOverlayView = overlayView
presentViewController(imagePicker, animated: true, completion: nil)
}
func handleSnapTap(recognizer: UITapGestureRecognizer) {
println("Take picture")
imagePicker.takePicture()
self.performSegueWithIdentifier("cameraToImageViewSegue", sender: self)
}
func handleCancelTap(recognizer: UITapGestureRecognizer) {
println("Cancel")
self.imagePicker.dismissViewControllerAnimated(true, completion: nil)
}
func handleChangeCameraTap(recognizer: UITapGestureRecognizer) {
if (hasChangedCamera == nil){
imagePicker.cameraDevice = UIImagePickerControllerCameraDevice.Front
hasChangedCamera = true
return
}
if (hasChangedCamera == true){
imagePicker.cameraDevice = UIImagePickerControllerCameraDevice.Rear
hasChangedCamera = false
return
}
if (hasChangedCamera! == false){
imagePicker.cameraDevice = UIImagePickerControllerCameraDevice.Front
hasChangedCamera = true
return
}
}
func handleFlashTap(recognizer: UITapGestureRecognizer) {
if (hasTurnedOnFlash == nil){
imagePicker.cameraFlashMode = UIImagePickerControllerCameraFlashMode.On
hasTurnedOnFlash = true
return
}
if (hasTurnedOnFlash == true){
imagePicker.cameraFlashMode = UIImagePickerControllerCameraFlashMode.Off
hasTurnedOnFlash = false
return
}
if (hasTurnedOnFlash == false){
imagePicker.cameraFlashMode = UIImagePickerControllerCameraFlashMode.On
hasTurnedOnFlash = true
return
}
}
And finally present a new view controller in which the picked image is placed in a UIView, and edit it from there. My issue is how to segue directly from the UIImagePickerController to a new view controller. I have tried the following:
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
self.imagePicker.dismissViewControllerAnimated(false, completion: nil)
let vc = ModifyCameraImageViewController() //change this to your class name
self.presentViewController(vc, animated: false, completion: nil)
}
First off, this just leads to a black screen, but I'm sure there's a simple enough way around that. My main issue is the fact that the view controller from which the UIImagePickerController was presented briefly appears on the screen before the next view controller appears. This obviously does not look good. I also tried removing the dismissViewController function, as well as placing the presentViewController function above the dismissView controller function. Both of these attempts gave me the error message:
Warning: Attempt to present <xxx.ModifyCameraImageViewController: 0x145e3eb70> on <xxx.ViewController: 0x145d20a60> whose view is not in the window hierarchy!
Attempting to use performSegueWithIdentifier with a segue linking the underlying view and the next view controller gives the same error warning.
I have found the following similar question, but I am completely inept at Objective C, so I'm struggling to make any sense of it: Push a viewController from the UIImagePickerController camera view
So, can anyone help in regards to how to present a view controller directly from the UIImagePickerController?
Also, keep in mind that I'm doing this in order to be able to create a text overlay on the newly picked image (like in Snapchat), so if anyone has a more elegant solution to that, feel free to post it!
Thanks!

Ok, found a simple solution to my issue. Instead of presenting the imagePickerController from the underlying view controller when the takePicture button is pressed, and segueing to another view controller directly from there, use the takePicture button to segue to another view controller and present the imagePickerController from the viewDidLoad of the second view controller. The second view controller will then be presented when the imagePickerController is dismissed. This however requires the underlying view controller to look similar to the camera controls, and some playing around with animations for this to look natural.

let pickerController: Void = picker.dismissViewControllerAnimated(true) { _ in
UIImageView.image = info[UIImagePickerControllerOriginalImage] as? UIImage
self.performSegueWithIdentifier("segueIdentifier", sender: nil)
//Do what you want when picker is dismissed
}

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The data source is whatever class conforms to the QLPreviewControllerDataSource protocol
Here is a video guide from apple on how to achieve this easily
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