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 10
    }

    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.section) \(indexPath.row)"

        return cell
    }

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

        guard let identifier = segue.identifier else {
            return
        }

        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
    }
}