IQKeyboardManager/Demo/Swift_Demo/ViewController/CollectionViewDemoController.swift

//
//  CollectionViewDemoController.swift
//  IQKeyboardManager
//
//  Created by InfoEnum02 on 20/04/15.
//  Copyright (c) 2015 Iftekhar. All rights reserved.
//

import UIKit

class CollectionViewDemoController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UIPopoverPresentationControllerDelegate {

    @IBOutlet var collectionView: UICollectionView!

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 20
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        let cell: UICollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "TextFieldCollectionViewCell", for: indexPath)

        let textField = cell.viewWithTag(10) as? UITextField
        textField?.placeholder = "\((indexPath as NSIndexPath).section) \((indexPath as NSIndexPath).row)"

        return cell
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

        if let identifier = segue.identifier {

            if identifier == "SettingsNavigationController" {

                let controller = segue.destination

                controller.modalPresentationStyle = .popover
                controller.popoverPresentationController?.barButtonItem = sender as? UIBarButtonItem

                let heightWidth = max(UIScreen.main.bounds.width, UIScreen.main.bounds.height)
                controller.preferredContentSize = CGSize(width: heightWidth, height: heightWidth)
                controller.popoverPresentationController?.delegate = self
            }
        }
    }

    func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
        return .none
    }

    func prepareForPopoverPresentation(_ popoverPresentationController: UIPopoverPresentationController) {
        self.view.endEditing(true)
    }

    override var shouldAutorotate: Bool {
        return true
    }
}