platform-ios/RainbowPlanet/RainbowPlanet/Modules/PublishModule/PublishEditController/View/PublishEditAddPicCell.swift

//
//  PublishEditAddPicCell.swift
//  RainbowPlanet
//
//  Created by Christopher on 2019/6/17.
//  Copyright © 2019 RainbowPlanet. All rights reserved.
//

import UIKit

class PublishEditAddPicCell: UITableViewCell {
    
    private let maxImageCount: Int = 3
    
    typealias ChoosePicBlock = () -> Void
    var choosePicBlock : ChoosePicBlock?
    
    typealias DelPicTransBlock = (_ idxRow:Int?) -> Void
    var delPicTransBlock : DelPicTransBlock?
    
    var imgCount: Int = 0
    var goodsImageArr: Array<UIImage>? {
        didSet {
            imgCount = self.goodsImageArr?.count ?? 0
        }
    }
    
    class func cellWith(tableView:UITableView,indexPath:IndexPath) -> PublishEditAddPicCell {
        let ID = "PublishEditAddPicCell"
        tableView.register(PublishEditAddPicCell.self, forCellReuseIdentifier: ID)
        let cell : PublishEditAddPicCell = tableView.dequeueReusableCell(withIdentifier: ID, for: indexPath) as! PublishEditAddPicCell
        cell.indexPath = indexPath
        return cell
    }
    
    override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
        setupViews()
        setupLayouts()
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    var indexPath: IndexPath? {
        didSet {
            
        }
    }
    
    //MRAK: - 设置View
    private func setupViews() {
        self.selectionStyle = .none
        
        addSubview(collectionView)
    }
    
    private func setupLayouts() {
        collectionView.snp.remakeConstraints { (make) in
            make.top.equalTo(15)
            make.bottom.equalTo(-15)
            make.left.right.equalToSuperview()
        }
    }
    
    private lazy var collectionView: UICollectionView = {
        let collectionView = UICollectionView.init(frame: CGRect.zero, collectionViewLayout: collectionViewLayout)
        collectionView.backgroundColor = kffffffColor
        collectionView.delegate = self;
        collectionView.dataSource = self;
        collectionView.showsVerticalScrollIndicator = false
        collectionView.showsHorizontalScrollIndicator = false
        return collectionView
    }()
    
    private lazy var collectionViewLayout: UICollectionViewFlowLayout = {
        let collectionViewLayout = UICollectionViewFlowLayout.init()
        collectionViewLayout.minimumInteritemSpacing = 10
        collectionViewLayout.scrollDirection = .horizontal
        return collectionViewLayout
    }()
    
}

extension PublishEditAddPicCell: UICollectionViewDelegateFlowLayout,UICollectionViewDataSource,UICollectionViewDelegate {
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 1
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        if imgCount < maxImageCount {
            return imgCount+1
        } else {
            return maxImageCount
        }        
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        if imgCount < maxImageCount && indexPath.row == imgCount {
            // 添加图片
            let cell = PublishEditDefaultCollectionCell.cellWith(collectionView: collectionView, indexPath: indexPath)
            if imgCount == 0 {
                cell.noteStr = "添加图片"
            } else {
                cell.noteStr = "\(imgCount)/\(maxImageCount)"
            }
            return cell
        } else {
            // 展示图片
            let pCell = PublishEditAddImgCollectionCell.cellWith(collectionView: collectionView, indexPath: indexPath)
            if indexPath.row < imgCount {
                pCell.showImage = self.goodsImageArr![indexPath.row]
            }
            pCell.delPicBlock = {
                [weak self] (idxRow) in
                if let delPicTransBlock = self?.delPicTransBlock {
                    delPicTransBlock(idxRow)
                }
            }
            return pCell
        }
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width:100, height: 100)
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
        return UIEdgeInsets(top: 0, left: 14, bottom: 0, right: 14)
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        if imgCount < maxImageCount && indexPath.row == imgCount {
            // 添加图片
            if let choosePicBlock = self.choosePicBlock {
                choosePicBlock()
            }
        }
    }
    
}