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照片选择器监听cell点击事件

• 点击cell 的 加号按钮 需要弹出系统的相册.系统的相册需要控制器来完成.所有cell里面的事件需要控制器来处理. 使用代理

• 定义 cell的点击事件协议

  // MARK: - cell的点击事件协议
  // 1.定义协议
  protocol HMPhotoSelectorCellDelegate: NSObjectProtocol {
    // 加号按钮点击
    func photoSelectorCellDidClickAddButton(cell: HMPhotoSelectorCell)
  
    // 删除按钮点击
    func photoSelectorCellDidClickDeleteButton(cell: HMPhotoSelectorCell)
  }
  

• CZPhotoSelectorCell 添加 cellDelegate 属性

  /// 代理
  weak var delegate: HMPhotoSelectorCellDelegate?
  

• 按钮添加点击事件

  /// 加号按钮
  private lazy var addButton: UIButton = {
    let button = UIButton()
  
    button.setImage(UIImage(named: "compose_pic_add"), for: UIControlState.normal)
    button.addTarget(self, action: #selector(addButtonDidClick), for: .touchUpInside)
  
    return button
  }()
  

  /// 删除按钮
  private lazy var deleteButton: UIButton = {
    let button = UIButton()
  
    button.setImage(UIImage(named: "compose_photo_close"), for: UIControlState.normal)
    button.addTarget(self, action: #selector(deleteButtonDidClick), for: .touchUpInside)
  
    return button
  }()
  

• HMPhotoSelectorCell 添加对应的按钮点击响应事件

  // MARK: - 按钮点击事件
  func addButtonDidClick() -> Void {
    delegate?.photoSelectorCellDidClickAddButton(cell: self)
  }
  

  func deleteButtonDidClick() -> Void {
    delegate?.photoSelectorCellDidClickDeleteButton(cell: self)
  }
  

• HMPhotoSelectorViewController 的 cellForItemAtIndexPath 设置cell的代理

  override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! HMPhotoSelectorCell
  
    cell.backgroundColor = UIColor.brown
    cell.delegate = self
  
    return cell
  }
  

• 扩展 HMPhotoSelectorViewController 实现 HMPhotoSelectorCellDelegate 协议

  // MARK: - 扩展 HMPhotoSelectorViewController //
  extension HMPhotoSelectorViewController: HMPhotoSelectorCellDelegate {
    func photoSelectorCellDidClickDeleteButton(cell: HMPhotoSelectorCell) {
  
    }
  
    func photoSelectorCellDidClickAddButton(cell: HMPhotoSelectorCell) {
  
    }
  }