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照片选择器自定义cell

• 系统没有提供对应的cell.需要自定义

  • 新建 HMPhotoSelectorCell 继承 UICollectionViewCell

    /// 自定义cell
    class HMPhotoSelectorCell: UICollectionViewCell {
    
      // MARK: - 构造函数
      required init?(coder aDecoder: NSCoder) {
          fatalError("init(coder:) has not been implemented")
      }
    
      override init(frame: CGRect) {
          super.init(frame: frame)
      }
    }
    

  • HMPhotoSelectorCell 懒加载控件

    // MARK: - 懒加载控件
    /// 加号按钮
    private lazy var addButton: UIButton = {
      let button = UIButton()
    
      button.setImage(UIImage(named: "compose_pic_add"), for: UIControlState.normal)
    
      return button
    }()
    

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

  • HMPhotoSelectorCell 添加 setupUI

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

    // MARK: - 准备UI
    /// 准备UI
    private func setupUI() {
      // 添加子控件
      contentView.addSubview(addButton)
      contentView.addSubview(deleteButton)
    
      // 添加约束
      // 作为独立工程最好少依赖第三方框架
      addButton.translatesAutoresizingMaskIntoConstraints = false
      deleteButton.translatesAutoresizingMaskIntoConstraints = false
    
      let viewDicts = ["ab": addButton, "rb": deleteButton]
      // 添加按钮
      contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-0-[ab]-0-|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewDicts))
      contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-0-[ab]-0-|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewDicts))
    
      // 删除按钮
      // 水平方向在父控件右边一定距离
      contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:[rb]-0-|", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewDicts))
    
      // 垂直方向在父控件顶部一定距离
      contentView.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-0-[rb]", options: NSLayoutFormatOptions(rawValue: 0), metrics: nil, views: viewDicts))
    }
    

  • 修改注册的cell

    // 注册cell
    collectionView!.registerClass(HMPhotoSelectorCell.self, forCellWithReuseIdentifier: reuseIdentifier)