我是 iOS 开发新手。我想在两个具有相同 UI 的不同 View Controller 中创建 collectionView。我只想创建一个 UICollectionView 并在不同的 View Controller 上重新使用它，而不是创建单独的 collectionViews 。我可以遵循的方法是创建 UICollectionViewController 子类并将其作为 subview Controller 添加到我的 View Controller 上，但不确定这是否是正确的方法不知道 addChildViewcontroller 是如何工作的以及如何在 subview Controller 和父 View Controller 之间传递数据。如果有人可以提供帮助，那就太好了。如果有任何示例代码可用于实现此目的，请告诉我。

非常感谢任何帮助。

最佳答案

您可以传递相同的 Collection View Controller 实例。在第一类和第二类中将其添加到 viewWillAppear 中并从 viewDidDisappear 中删除。这是您可以使用的示例代码，

extension UIColor {
class func randomColor() -> UIColor {
    let red = CGFloat(arc4random_uniform(255)) / 255.0
    let green = CGFloat(arc4random_uniform(255)) / 255.0
    let blue = CGFloat(arc4random_uniform(255)) / 255.0

    return UIColor(red: red, green: green, blue: blue, alpha: 1.0)
}

class MyCollectionViewController: UICollectionViewController {

    let  data: [UIColor]

    init(data: [UIColor]) {
        self.data = data
        let layout = UICollectionViewFlowLayout()
        layout.itemSize = CGSizeMake(100, 100)
        layout.scrollDirection = UICollectionViewScrollDirection.Vertical

        super.init(collectionViewLayout: layout)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        collectionView?.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: "cell")
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return data.count
    }

    override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath)
        cell.backgroundColor = data[indexPath.item]
        return cell
    }
}


class FirstViewController: UIViewController {

    lazy var myData:[UIColor] = {
        var allData = [UIColor]()
        for i in 0 ..< 20 {
            allData.append(UIColor.randomColor())
        }
        return allData
    }()

    var collectionViewController: MyCollectionViewController!

    override func viewDidLoad() {
        super.viewDidLoad()
        collectionViewController = MyCollectionViewController(data: self.myData)

        let barButton = UIBarButtonItem(title: "Show next", style: .Plain, target: self, action: "showNext:")
        navigationItem.rightBarButtonItem = barButton
    }

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)

        let collectionView = collectionViewController.view
        collectionView.translatesAutoresizingMaskIntoConstraints = false

        view.addSubview(collectionView)
        addChildViewController(collectionViewController)

        collectionView.topAnchor.constraintEqualToAnchor(view.topAnchor).active = true
        collectionView.bottomAnchor.constraintEqualToAnchor(view.bottomAnchor).active = true
        collectionView.leftAnchor.constraintEqualToAnchor(view.leftAnchor).active = true
        collectionView.rightAnchor.constraintEqualToAnchor(view.rightAnchor).active = true

        collectionViewController.didMoveToParentViewController(self)
    }

    override func viewWillDisappear(animated: Bool) {
        super.viewDidDisappear(animated)

        collectionViewController.willMoveToParentViewController(nil)
        collectionViewController.view.removeFromSuperview()
        collectionViewController.removeFromParentViewController()
    }

    func showNext(sender: AnyObject) {
        let secondViewController = SecondViewController(collectionViewController: collectionViewController)
        navigationController?.pushViewController(secondViewController, animated: true)
    }
}

class SecondViewController: UIViewController {

    var collectionViewController: MyCollectionViewController!

    init(collectionViewController: MyCollectionViewController) {
        self.collectionViewController = collectionViewController
        super.init(nibName: nil, bundle: nil)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)

        let collectionView = collectionViewController.view

        view.addSubview(collectionView)
        collectionView.translatesAutoresizingMaskIntoConstraints = false
        addChildViewController(collectionViewController)

        collectionView.topAnchor.constraintEqualToAnchor(view.topAnchor).active = true
        collectionView.bottomAnchor.constraintEqualToAnchor(view.bottomAnchor).active = true
        collectionView.leftAnchor.constraintEqualToAnchor(view.leftAnchor).active = true
        collectionView.rightAnchor.constraintEqualToAnchor(view.rightAnchor).active = true

        collectionViewController.didMoveToParentViewController(self)
    }

    override func viewWillDisappear(animated: Bool) {
        super.viewDidDisappear(animated)

        collectionViewController.willMoveToParentViewController(nil)
        collectionViewController.view.removeFromSuperview()
        collectionViewController.removeFromParentViewController()
    }
}

关于ios - 创建 UICollectionViewController 子类并添加为 childviewcontroller，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35520899/