本文介绍照片的显示与移除，并介绍CollectionView的使用(SmartAgency CreatePdf)

 let _layout = UICollectionViewFlowLayout()
var pictureArray = [PdfModel]()
1 在ViewDidLoad中调用CollectionView的方法
  override func viewDidLoad(){
   super.viewDidLoad()
    self.configCollectionView()
}
 func configCollectionView(){
        //collectionView初始化
        self.collectionView = UICollectionView.init(frame: CGRect.zero, collectionViewLayout: _layout)
        let rgb = 244 / 255.0;
       //横竖屏设置
        collectionView.alwaysBounceVertical = true
        collectionView.backgroundColor = UIColor.init(colorLiteralRed: Float(rgb), green: Float(rgb), blue: Float(rgb), alpha: 1.0)
        collectionView.contentInset = UIEdgeInsetsMake(4, 4, 4, 4)
        collectionView.delegate = self
        collectionView.dataSource = self
        collectionView.keyboardDismissMode = .onDrag
        self.topView.addSubview(collectionView)
        collectionView.register(TZTestCell.self, forCellWithReuseIdentifier: "TZTestCell")
    }
 override func viewDidLayoutSubviews(){
        super.viewDidLayoutSubviews()
        let contentSizeH = 20
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
            self.scrollView.contentSize = CGSize.init(width: 0, height: contentSizeH + 5)
            }
        let _margin:CGFloat =  4
        _layout.itemSize  = CGSize.init(width:45, height:45)
        _layout.minimumInteritemSpacing = CGFloat(_margin);
        _layout.minimumLineSpacing = CGFloat(_margin);
        self.collectionView.setCollectionViewLayout(_layout, animated: true)
       // 设置CollectionView的大小
        self.collectionView.frame =  CGRect.init(x: 0, y: 0, width:self.topView.frame.width - 10 , height: self.topView.frame.height - 20)
     }
设置CollectionView的代理方法
 @available(iOS 6.0, *)
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "TZTestCell", for: indexPath) as!TZTestCell
        cell.videoImageView.isHidden = true
        if(indexPath.row == pictureArray.count){
            //cell.imageView.image = _selectedPhotos[indexPath.row]
            cell.imageView.image = UIImage.init(named: "AlbumAddBtn.png")
            cell.deleteBtn.isHidden = true
            cell.gifLable.isHidden = true
        } else{
            let model = pictureArray[indexPath.row]
            cell.imageView.image = model.imgName
            cell.deleteBtn.isHidden = false
        }
        cell.deleteBtn.tag = indexPath.row
        cell.deleteBtn.addTarget(self, action:#selector(deleBtnClick(_:)), for: .touchUpInside)
        return cell
    }
 @available(iOS 6.0, *)
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return pictureArray.count + 1;
    }
   func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath){
        print("111111111111111111111111111111111111")
        if (indexPath.row == pictureArray.count){
           self.pushTZImagePickerController()
            
        }else{
            let model = pictureArray[indexPath.row]
            let photos = model.imgName
            let imagePickerVC = TZImagePickerController.init(selectedAssets: pictureArray as! NSMutableArray, selectedPhotos: pictureArray as! NSMutableArray, index: indexPath.row)
            imagePickerVC?.didFinishPickingPhotosHandle = { [weak self] (photos, assets, isSelectOriginalPhoto) in
                self?.pictureArray = NSMutableArray.init(array: (self?.pictureArray)!) as! [PdfModel]
                collectionView.reloadData()
                collectionView.contentSize = CGSize.init(width: CGFloat(0), height: (CGFloat((self?.pictureArray.count)!) + CGFloat(2))/CGFloat(3) * (CGFloat((self?._margin)!) + CGFloat((self?._itemWH)!)))
                self?.present(imagePickerVC!, animated: true, completion: nil)
               }
        }
       }
 func pushTZImagePickerController(){
        let imagePickVC = TZImagePickerController.init(maxImagesCount: 1, delegate: self)
        imagePickVC?.didFinishPickingPhotosHandle = { [weak self] (photos, assets, isSelectOriginalPhoto) in
            let image = photos?.first
            self?.imageData = UIImageJPEGRepresentation(image!, 0.3) //压缩
            let tempImg = UIImage.init(data: (self?.imageData!)!)
            
            let fileManager = FileManager.default
            //let filePath = String.
            //拿到本地的documents路径
            let docPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first
            let filePath = "\(docPath!)/image1"
            if (!fileManager.fileExists(atPath: filePath)){
                try?  fileManager.createDirectory(atPath: filePath, withIntermediateDirectories: true, attributes: nil)
                
            }
            let uuid = UUID.init()
            let imageNamePath = "\(filePath)/\(uuid).png"
            try? fileManager.createFile(atPath: imageNamePath, contents: self?.imageData, attributes: nil)
            let pdfModel = PdfModel()
            pdfModel.imgPath = imageNamePath
            pdfModel.imgName = tempImg
            self?.pictureArray.append(pdfModel)
            DispatchQueue.main.async {
                self?.collectionView.reloadData()
            }
            
        }
        //第三方封装号打开相册
        self.present(imagePickVC!, animated: true, completion: nil)
    }
 //collection完成选择图片后的方法
    func deleBtnClick(_ btn:UIButton){
        pictureArray.remove(at: btn.tag)
        collectionView.performBatchUpdates({ 
            let indexPath = IndexPath.init(row: btn.tag, section: 0)
            self.collectionView.deleteItems(at: [indexPath])
        }) { (finished) in
            self.collectionView.reloadData()
        }
        
     }
 //向照片数组中添加照片，刷新CollectionView
    func refreshCollectionViewWithAddedAsset(image:UIImage){
        self.pdfModel.imgName = image
        self.pictureArray.append(self.pdfModel)
        collectionView.reloadData()
        
    }
//CollectionView通过Layout 方法布局CollectionViewCell 所在的位置 
      public func collectionView(_ collectionView: UICollectionView, layout      collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: collectionView.frame.width - 1, height: 650 * (collectionView.frame.width - 1)/(842) )
    }