ios/PostViewController.swift at master · SpartaHack2019/ios · GitHub

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//
//  PostViewController.swift
//
//
//  Created by Austin Evans on 1/19/19.
//

import UIKit

class PostViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    var selectedImage: UIImage?

    override func viewDidLoad() {
        super.viewDidLoad()

        navigationController?.navigationBar.titleTextAttributes = [NSAttributedString.Key.font: UIFont(name: "Comfortaa", size: 30)!]
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "SubmissionFormIdentifier",
            let image = selectedImage {
            let destiation = segue.destination as! PostSubmitViewController
            destiation.newImage = image
        }
    }

    @IBAction func photoLibraryTapped(_ sender: Any) {
        if UIImagePickerController.isSourceTypeAvailable(.photoLibrary) {
            let pickerController = UIImagePickerController()
            pickerController.delegate = self
            pickerController.sourceType = .photoLibrary
            self.present(pickerController, animated: true, completion: nil)
        }
    }

    @IBAction func cameraTapped(_ sender: Any) {
        if UIImagePickerController.isSourceTypeAvailable(.camera) {
            let pickerController = UIImagePickerController()
            pickerController.delegate = self
            pickerController.sourceType = .camera
            self.present(pickerController, animated: true, completion: nil)
        }
    }

    func imagePickerController(_ picker: UIImagePickerController,
                               didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
        dismiss(animated: true, completion: nil)
        if let image = info[.originalImage] as? UIImage {
            selectedImage = cropToBounds(image: image, width: 400, height: 400)
        }
        performSegue(withIdentifier: "SubmissionFormIdentifier", sender: nil)
    }

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

    // https://stackoverflow.com/questions/32041420/cropping-image-with-swift-and-put-it-on-center-position
    func cropToBounds(image: UIImage, width: Double, height: Double) -> UIImage {

        let cgimage = image.cgImage!
        let contextImage: UIImage = UIImage(cgImage: cgimage)
        let contextSize: CGSize = contextImage.size
        var posX: CGFloat = 0.0
        var posY: CGFloat = 0.0
        var cgwidth: CGFloat = CGFloat(width)
        var cgheight: CGFloat = CGFloat(height)

        // See what size is longer and create the center off of that
        if contextSize.width > contextSize.height {
            posX = ((contextSize.width - contextSize.height) / 2)
            posY = 0
            cgwidth = contextSize.height
            cgheight = contextSize.height
        } else {
            posX = 0
            posY = ((contextSize.height - contextSize.width) / 2)
            cgwidth = contextSize.width
            cgheight = contextSize.width
        }

        let rect: CGRect = CGRect(x: posX, y: posY, width: cgwidth, height: cgheight)

        // Create bitmap image from context using the rect
        let imageRef: CGImage = cgimage.cropping(to: rect)!

        // Create a new image based on the imageRef and rotate back to the original orientation
        let image: UIImage = UIImage(cgImage: imageRef, scale: image.scale, orientation: image.imageOrientation)

        return image
    }
}