Swift: Take photo button action

takephoto.swift

@IBAction func takePhoto(sender: UIButton) {
        
        let imagePicker: UIImagePickerController! = UIImagePickerController()
        imagePicker.delegate = self
        
        if (UIImagePickerController.isSourceTypeAvailable(.Camera)) {
            if UIImagePickerController.availableCaptureModesForCameraDevice(.Front) != nil {
                imagePicker.allowsEditing = false
                imagePicker.sourceType = .Camera
                imagePicker.cameraCaptureMode = .Photo
                imagePicker.cameraDevice = .Front
                imagePicker.modalPresentationStyle = .OverCurrentContext
                presentViewController(imagePicker, animated: true, completion: {})
            } else {
                print("Camera not found")
            }
        } else {
            print("Application cannot access the camera.")
        }
    }

Why do you have a ! at the end of the constant declaration? It's not really required.

let imagePicker: UIImagePickerController! = UIImagePickerController()

Use guards instead of nested Ifs

guard UIImagePickerController.isSourceTypeAvailable(.Camera) else {
    print("Application cannot access the camera.")
    return
}    

guard UIImagePickerController.availableCaptureModesForCameraDevice(. Front) else {
    print("Front camera not found")
    return
}    

imagePicker.allowsEditing = false
imagePicker.sourceType = .Camera
imagePicker.cameraCaptureMode = .Photo
imagePicker.cameraDevice = .Front
imagePicker.modalPresentationStyle = .OverCurrentContext
presentViewController(imagePicker, animated: true, completion: {})

Hmm @eviltofu, still having the warning
2016-07-07 16:47:52.130 Guestbook[3132:1758832] Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.

@IBAction func takePhoto(sender: UIButton) {

        let imagePicker: UIImagePickerController = UIImagePickerController()
        imagePicker.delegate = self

        guard UIImagePickerController.isSourceTypeAvailable(.Camera) else {
            print("Application cannot access the camera.")
            return
        }

        guard (UIImagePickerController.availableCaptureModesForCameraDevice(.Front) != nil) else {
            print("Camera not found")
            return
        }

        imagePicker.allowsEditing = false
        imagePicker.sourceType = .Camera
        imagePicker.cameraCaptureMode = .Photo
        imagePicker.cameraDevice = .Front
        imagePicker.modalPresentationStyle = .OverCurrentContext
        presentViewController(imagePicker, animated: true, completion: {})

    }

Try presenting using something other than over current context