Swift协议语法，其中Self:既是UICollectionViewDataSource也是UICollectionViewDelegate

Question

我正在尝试创建一个协议，该协议将自动向符合的任何UIViewController添加一个UICollectionView。

下面是我当前的代码：

protocol ReusableNavigation {
    var actionContainer: UIView! { get }
    func addActionMenuCollection()
}

extension ReusableNavigation where Self: UICollectionViewDataSource {
    func addActionMenuCollection() {
        let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()

        layout.sectionInset = UIEdgeInsets(top: 20, left: 10, bottom: 10, right: 10)
        layout.itemSize = CGSize(width: 60, height: 60)
        let actionMenu:UICollectionView = UICollectionView(frame: self.actionContainer.frame, collectionViewLayout: layout)

        actionMenu.dataSource = self
        actionMenu.delegate = self
        actionMenu.register(UINib(nibName: "ActionCell", bundle: nil), forCellWithReuseIdentifier: "actionCell")
        actionMenu.semanticContentAttribute = UISemanticContentAttribute.forceRightToLeft
        self.actionContainer.addSubview(actionMenu)
    }
}

显然，当我尝试设置actionMenu委托时，上面的代码错误，因为self只是一个UICollectionViewDataSource

我无论如何也找不出self等于UICollectionViewDataSource和UICollectionViewDelegate的协议扩展的语法。

有可能吗？有什么想法？

Answer 1

添加约束条件，用逗号分隔

extension ReusableNavigation where Self: UICollectionViewDataSource,  Self: UICollectionViewDelegate { ...

或“与”号连接

extension ReusableNavigation where Self: UICollectionViewDataSource & UICollectionViewDelegate