Swift 在循环中添加到ContainerViews

我想使用containerviews包含collectionview的三个实例

我的销售渠道是：

@IBOutlet weak var topContainer: UIView!
@IBOutlet weak var middleContainer: UIView!
@IBOutlet weak var bottomContainer: UIView!

我可以做到：使用一个恶心的解决方案，在viewdidload中重复代码：

    topContainer.translatesAutoresizingMaskIntoConstraints = false
    middleContainer.translatesAutoresizingMaskIntoConstraints = false
    bottomContainer.translatesAutoresizingMaskIntoConstraints = false
    // add child view controller view to container
    if let controller = storyboard!.instantiateViewController(withIdentifier: "collectionscroll") as? CollectionScrollViewController {
        addChild(controller)
        controller.view.translatesAutoresizingMaskIntoConstraints = false
        topContainer.addSubview(controller.view)

        NSLayoutConstraint.activate([
            controller.view.leadingAnchor.constraint(equalTo: topContainer.leadingAnchor),
            controller.view.trailingAnchor.constraint(equalTo: topContainer.trailingAnchor),
            controller.view.topAnchor.constraint(equalTo: topContainer.topAnchor),
            controller.view.bottomAnchor.constraint(equalTo: topContainer.bottomAnchor)
            ])
        controller.didMove(toParent: self)
    }

    if let controller = storyboard!.instantiateViewController(withIdentifier: "collectionscroll") as? CollectionScrollViewController {
        addChild(controller)
        controller.view.translatesAutoresizingMaskIntoConstraints = false
        middleContainer.addSubview(controller.view)


        NSLayoutConstraint.activate([
            controller.view.leadingAnchor.constraint(equalTo: middleContainer.leadingAnchor),
            controller.view.trailingAnchor.constraint(equalTo: middleContainer.trailingAnchor),
            controller.view.topAnchor.constraint(equalTo: middleContainer.topAnchor),
            controller.view.bottomAnchor.constraint(equalTo: middleContainer.bottomAnchor)
            ])
        controller.didMove(toParent: self)

    }


    if let controller = storyboard!.instantiateViewController(withIdentifier: "collectionscroll") as? CollectionScrollViewController {
        addChild(controller)
        controller.view.translatesAutoresizingMaskIntoConstraints = false
        bottomContainer.addSubview(controller.view)


        NSLayoutConstraint.activate([
            controller.view.leadingAnchor.constraint(equalTo: bottomContainer.leadingAnchor),
            controller.view.trailingAnchor.constraint(equalTo: bottomContainer.trailingAnchor),
            controller.view.topAnchor.constraint(equalTo: bottomContainer.topAnchor),
            controller.view.bottomAnchor.constraint(equalTo: bottomContainer.bottomAnchor)
            ])
        controller.didMove(toParent: self)

    }

因此，为了避免重复代码，我考虑使用looop：

lazy var containers : [UIView] = [topContainer, middleContainer, bottomContainer]

    for container in containers {
        container.translatesAutoresizingMaskIntoConstraints = false
        if let controller = storyboard!.instantiateViewController(withIdentifier: "collectionscroll") as? CollectionScrollViewController {
            addChild(controller)
            controller.view.translatesAutoresizingMaskIntoConstraints = false
            topContainer.addSubview(controller.view)

            NSLayoutConstraint.activate([
                controller.view.leadingAnchor.constraint(equalTo: container.leadingAnchor),
                controller.view.trailingAnchor.constraint(equalTo: container.trailingAnchor),
                controller.view.topAnchor.constraint(equalTo: container.topAnchor),
                controller.view.bottomAnchor.constraint(equalTo: container.bottomAnchor)
                ])
            controller.didMove(toParent: self)
        }
    }

但它不起作用-中间的视图不填充，最后一个视图不滚动

---

如何在不复制意大利面食代码的情况下填充容器？

我看到一个错误。当您通过添加循环来转换代码时，您忘记将

topContainer

s中的一个更改为

container

更改：

topContainer.addSubview(controller.view)

致：

container.addSubview(controller.view)