swiftImagePicker，第一次迭代

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import UIKit
import Kingfisher
protocol ImagPickerProtocol {
var onImageClick: ((_ collectionView: UICollectionView, _ indexPath: IndexPath) -> ())? {get set}
}
class ImagePicker: UICollectionView, ImagPickerProtocol {

var onImageClick: ((_ collectionView: UICollectionView, _ indexPath: IndexPath) -> ())?
var images = [String]()
var max = 5

override init(frame: CGRect, collectionViewLayout layout: UICollectionViewLayout) {
super.init(frame: frame, collectionViewLayout: layout)
setupSelf()
}

required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
setupSelf()
}

private func setupSelf() {
backgroundColor = UIColor.white
dataSource = self
delegate = self
}
}
extension ImagePicker: UICollectionViewDataSource {

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "pictureCell", for: indexPath) as! PictureCell
let size = images.count
if (indexPath.row == size) { cell.backgroundColor = UIColor.gray }
else {
let url = URL(string: images[indexPath.row])
cell.picture.kf.setImage(with: url)
}
return cell
}

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
let size = images.count
if (size return size
}
}
extension ImagePicker: UICollectionViewDelegateFlowLayout {

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
onImageClick?(collectionView, indexPath)
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 100, height: 100)
}
}

import UIKit
class CreateOfferViewController: BaseViewController, CreateOfferViewInput {

var imagePicker: ImagePicker?
var viewBuilder: ViewBuilder?

override func viewDidLoad() {
super.viewDidLoad()

view.backgroundColor = UIColor.white
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
imagePicker = ImagePicker(frame: CGRect(x: 0, y: 16, width: view.bounds.width, height: 100), collectionViewLayout: layout)
imagePicker?.OnImageClick= { [weak self] (collectionView, indexPath) in
let ipk = UIImagePickerController()
self?.present(ipk, animated: true, completion: nil)
}
view.addSubview(imagePicker!)
imagePicker?.register(PictureCell.self, forCellWithReuseIdentifier: "pictureCell")

imagePicker!.images = [
"https://firebasestorage.googleapis.com/v0/b/samuiplus-9d4b0.appspot.com/o/categories%2Foffers%2F-L7ZLum7uwZ7IAS1gP0n%2F-L7bM1f2aYGGwLNCDSNr%2Fimg_1518014663757.jpg?alt=media&token=34095b90-a53a-4413-8e67-f5633d154c1f",
"https://firebasestorage.googleapis.com/v0/b/samuiplus-9d4b0.appspot.com/o/categories%2Foffers%2F-L85HnRFlWJJwZeqHtLn%2F%D0%A1%D1%80%D0%B5%D0%B4%D0%B8-%D1%80%D0%B8%D1%81%D0%BE%D0%B2%D1%8B%D1%85-%D0%BF%D0%BE%D0%BB%D0%B5%D0%B8%CC%86-%D0%BE.-%D0%91%D0%B0%D0%BB%D0%B8-%D0%98%D0%BD%D0%B4%D0%BE%D0%BD%D0%B5%D0%B7%D0%B8%D1%8F.jpg?alt=media&token=96f4fbec-ca21-47ec-a776-af9551413c1a",
"https://firebasestorage.googleapis.com/v0/b/samuiplus-9d4b0.appspot.com/o/categories%2Foffers%2F-L85H0HTGT6s704K8qpt%2Fimages%20(62).jpg?alt=media&token=5b9c2537-2809-45a0-8a7d-48294ae974ca"]
}
}
// MARK: Button Action
extension CreateOfferViewController {

}

import UIKit
class PictureCell: UICollectionViewCell {

var picture = UIImageView()

override init(frame: CGRect) {
super.init(frame: frame)
initPicture()
}

required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
initPicture()
}

private func initPicture() {
picture.frame = CGRect(x: 0, y: 0, width: self.bounds.width, height: self.bounds.height)
picture.cOntentMode= .center
picture.clipsToBounds = true
picture.backgroundColor = UIColor.black
self.addSubview(picture)
}
}

import UIKit
class ImagePickerViewController: BaseCollectionViewController, ImagePickerViewInput, ImagPickerProtocol {

var onImageClick: ((_ collectionView: UICollectionView, _ indexPath: IndexPath) -> ())?
var images = [String]()
var max = 5

override func viewDidLoad() {
super.viewDidLoad()
}
}
// MARK: UICollectionViewDataSource
extension ImagePickerViewController {

override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "pictureCell", for: indexPath) as! PictureCell
let size = images.count
if (indexPath.row == size) { cell.backgroundColor = UIColor.gray }
else {
let url = URL(string: images[indexPath.row])
cell.picture.kf.setImage(with: url)
}
return cell
}

override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
let size = images.count
if (size return size
}
}
// MARK: UICollectionViewDelegate
extension ImagePickerViewController {

override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
onImageClick?(collectionView, indexPath)
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 100, height: 100)
}
}