weareopensource/Swift

#if os(iOS)
import UIKit

public protocol CellType: AnyObject {
    var reuseIdentifier: String? { get }
}

/// A generic class that represents reusable cells.
public struct ReusableCell<Cell: CellType> {
    public typealias Class = Cell

    public let `class`: Class.Type = Class.self
    public let identifier: String
    public let nib: UINib?

    /// Create and returns a new `ReusableCell` instance.
    ///
    /// - parameter identifier: A reuse identifier. Use random UUID string if identifier is not provided.
    /// - parameter nib: A `UINib` instance. Use this when registering from xib.
    public init(identifier: String? = nil, nib: UINib? = nil) {
        self.identifier = nib?.instantiate(withOwner: nil, options: nil).lazy
            .compactMap { ($0 as? CellType)?.reuseIdentifier }
            .first ?? identifier ?? UUID().uuidString
        self.nib = nib
    }

    /// A convenience initializer.
    ///
    /// - parameter identifier: A reuse identifier. Use random UUID string if identifier is not provided.
    /// - parameter nibName: A name of nib.
    public init(identifier: String? = nil, nibName: String) {
        let nib = UINib(nibName: nibName, bundle: nil)
        self.init(identifier: identifier, nib: nib)
    }
}

public protocol ViewType: AnyObject {
}

/// A generic class that represents reusable views.
public struct ReusableView<View: ViewType> {
    public typealias Class = View

    public let `class`: Class.Type = Class.self
    public let identifier: String
    public let nib: UINib?

    /// Create and returns a new `ReusableView` instance.
    ///
    /// - parameter identifier: A reuse identifier. Use random UUID string if identifier is not provided.
    /// - parameter nib: A `UINib` instance. Use this when registering from xib.
    public init(identifier: String? = nil, nib: UINib? = nil) {
        self.identifier = identifier ?? UUID().uuidString
        self.nib = nib
    }

    /// A convenience initializer.
    ///
    /// - parameter identifier: A reuse identifier. Use random UUID string if identifier is not provided.
    /// - parameter nibName: A name of nib.
    public init(identifier: String? = nil, nibName: String) {
        let nib = UINib(nibName: nibName, bundle: nil)
        self.init(identifier: identifier, nib: nib)
    }
}
#endif