swift 3 : Segue and pass in data from one class to another

Question

我有一个名为 HomeController 的简单 UICollectionViewController，它有一堆单元格。这些单元格有一个自己的类，称为 PostCell。我还有一个 NSObject 类，它保存每个 Post 的所有数据(这些帖子是我的单元格)。在我的 PostCell 中，我有一个名为 profileSegueContainer 的 UIView。当我点击这个 UIView 时，我想切换到一个新的 Controller 。我可以使用 PresentViewController 方法来实现此目的，但我也想传递该特定帖子的信息。例如，如果我点击一个 uid 为“1234”的单元格，我希望不仅能够连接到新 Controller ，而且还可以将此 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将其传递进去。我希望这是有道理的……我希望它的工作方式类似于 Instagram 的“点击用户即可访问他们的个人资料”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。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

Segue 在 View Controller 的上下文中具有非常具体的含义。您可能想使用短语“推送另一个 View Controller ”来代替。

首先，UINavigationController 通常只在场景中使用一次——它是跟踪 subview Controller 堆栈的 View Controller 。您只创建其中之一，并且您可能希望将 HomeController 设置为导航 Controller 的 rootViewController。

然后，当用户点击 View 时，您应该将其转发到要添加到 HomeController 的方法；这将创建您的自定义 UserProfile 类，使用所需的数据对其进行配置，然后调用:navigationController?.pushViewController(userProfile, animating: true)

有许多优秀的教程向您展示这一切是如何工作的。