Swift 3：Segue 并将数据从一个 class 传递到另一个

Question

我有一个名为 HomeController 的简单 UICollectionViewController，它有一堆单元格。这些细胞有自己的 class，称为 PostCell。我还有一个 NSObject class，它保存每个 Post 的所有数据（这些 post 是我的单元格）。在我的 PostCell 中，我有一个名为 profileSegueContainer 的 UIView。当我点击这个 UIView 时，我想转到一个新的控制器。我可以使用 presentViewController 方法实现此目的，但我还想传递特定 post 的信息。例如，如果我点击一个 uid 为“1234”的单元格，我不仅希望能够连接到新控制器，而且还能将此 uid 传递给它。当然，如果我点击下一个单元格并且该单元格的 post.uid 是“4567”，那么我也想在我继续时传递它。我希望这是有道理的……我希望它的工作方式类似于 Instagram 的 "tapped on a user to get to their profile" 功能。我希望这是有道理的。任何帮助将不胜感激，当然，我会标记为答案。谢谢你。所有相关代码如下：

class Post: NSObject {

var author: String?
var avatar_image_url: String?
var likes: Int?
var postImageUrl: String?
var uid: String?
var post_id: String?
var hashtags: [String]?
}

class HomeController: UICollectionViewController, UICollectionViewDelegateFlowLayout {

    var postCell: PostCell?
    var userProfileController: UserProfileController?

    var posts = [Post]()

    var timer: Timer?

    override func viewDidLoad() {
        super.viewDidLoad()

        self.collectionView?.backgroundColor = grayBackgroundColor

        self.collectionView?.register(PostCell.self, forCellWithReuseIdentifier: reuseIdentifier)

        self.collectionView?.contentInset = UIEdgeInsetsMake(16, 0, 16, 0)
        self.collectionView?.alwaysBounceVertical = true
        self.collectionView?.showsVerticalScrollIndicator = false

        setupNavigationBarBranding()
        checkIfUserIsLoggedIn()
        fetchPosts()
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        let frameWidth = self.view.frame.size.width
        let width = frameWidth - (16 + 16)
        let height = frameWidth - (16 / 9) + 50 + 50
        return CGSize(width: width, height: height)
    }

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

    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! PostCell

        cell.homeController = self
        cell.post = posts[indexPath.item]
        userProfileController?.post = posts[indexPath.item]

        return cell
    }
}

class PostCell: BaseCell {

var homeController: HomeController?
var userProfileController: UserProfileController?

var post: Post? {
    didSet {

        if let postDisplayName = post?.author {
            displayName.text = postDisplayName
        }

        if let postImageUrl = post?.postImageUrl {
            postImage.loadImageUsingCacheWithUrlString(urlString: postImageUrl)
        }

        if let postProfileImage = post?.avatar_image_url {
            profileImage.loadImageUsingCacheWithUrlString(urlString: postProfileImage)
        }

    }
}

lazy var profileSegueContainer: UIView = {
        let view = UIView()
        view.isUserInteractionEnabled = true
        return view
    }()

    func handleProfileSegue() {
    let userProfile = UserProfileController()
    let navigationUserProfile = UINavigationController(rootViewController: userProfile)
    homeController?.present(navigationUserProfile, animated: true, completion: nil)
}

    override func setupViews() {
    super.setupViews()

    let tap = UITapGestureRecognizer(target: self, action: #selector(handleProfileSegue))
    profileSegueContainer.addGestureRecognizer(tap)

addSubview(profileSegueContainer)

        _ = profileSegueContainer.anchor(profileImage.topAnchor, left: profileImage.leftAnchor, bottom: profileImage.bottomAnchor, right: displayName.rightAnchor, topConstant: 0, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: 0, heightConstant: 0)
}

Answer 1

在视图控制器的上下文中，Segue 具有非常具体的含义。您可能想改用短语 "push another view controller"。

首先，UINavigationController 通常只在一个场景中使用一次——它是跟踪一堆子视图控制器的视图控制器。您只创建其中一个，并且您可能希望将 HomeController 设置为导航控制器的 rootViewController。

然后当用户点击视图时，您应该将其转发给您将添加到 HomeController 的方法；这将创建您的自定义 UserProfile class，使用所需的数据配置它，然后调用：navigationController?.pushViewController(userProfile, animating: true)

有很多优秀的教程可以向您展示这一切是如何工作的。

Swift 3：Segue 并将数据从一个 class 传递到另一个

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