public extension LPAlbum {
    public struct Config {
        /// 最大选择数量
        public var maxSelectCount: Int = 6
        /// 每列照片数量
        public var columnCount: Int = 4
        /// 照片间距
        public var photoPadding: CGFloat = 2.0
        /// 是否有相机
        public var hasCamera: Bool = true
    }
    
    public struct Style {
        /// `NavigationBar`标题颜色
        public static var barTitleColor: UIColor = UIColor.white
        /// `NavigationBar`背景颜色
        public static var barTintColor: UIColor = UIColor.darkGray
        /// `NavigationBar`item文本颜色
        public static var tintColor: UIColor = UIColor.white
        /// 状态栏样式
        public static var statusBarStyle: UIStatusBarStyle = .lightContent
        /// 下拉箭头图片
        public static var arrowImage: UIImage = Bundle.imageFromBundle("meun_down")!
        /// 正常的选择框图片
        public static var normalBox: UIImage = Bundle.imageFromBundle("circle_normal")!
        /// 选中的选择框图片
        public static var selectedBox: UIImage = Bundle.imageFromBundle("circle_selected")!
    }
}

public enum AlbumError: Error {
    case noAlbumPermission
    case noCameraPermission
    case moreThanLargestChoiceCount
    case savePhotoError
    
    public var localizedDescription: String {
        switch self {
        case .noAlbumPermission: return String.local("没有相册访问权限")
        case .noCameraPermission: return String.local("没有摄像头访问权限")
        case .moreThanLargestChoiceCount: return String.local("达到了图片选择最大数量")
        case .savePhotoError: return String.local("保存图片失败")
        }
    }
}

// you can setup style yourself
LPAlbum.Style.barTintColor = .gray
LPAlbum.Style.tintColor = .white

// show
LPAlbum.show(at: self)  {
    $0.columnCount = 4
    $0.hasCamera = true
    $0.maxSelectCount = 9 - self.photos.count
}.targeSize({ (size) -> CGSize in
    return CGSize(width: 240, height: 240)
}).error {(vc, error) in
    vc.show(message: error.localizedDescription)
}.complete { [weak self](images) in
    self?.photos.append(contentsOf: images)
    self?.collectionView.reloadData()
    _ = images.map{ print($0.size) }
}