ios - 如何将文本放入 segue 函数以传递给下一个 Controller ？

Question

我想获取标题并将其作为 titleText 放入作为标签的 DestVC 中。如何将它放入 segue 函数中？

import UIKit
import Firebase
import FirebaseDatabase
import SDWebImage


struct postStruct {
    let title : String!
    let author : String!
    let date : String!
    let article : String!
    let downloadURL : String!

}

class ZeroHomeViewController: UITableViewController {




var posts = [postStruct]()
var  downloadURL : String = ""






override func viewDidLoad() {
    super.viewDidLoad()


    let ref = Database.database().reference().child("Posts")

    ref.observeSingleEvent(of: .value, with: { snapshot in

        print(snapshot.childrenCount)

        for rest in snapshot.children.allObjects as! [DataSnapshot] {

            guard let value = rest.value as? Dictionary<String,Any> else { continue }

            guard let  title = value["Title"] as? String else { continue }
            guard let  downloadURL = value["Download URL"] as? String else { continue }
            guard let  author = value["Author"] as? String else { continue }
            guard let  date = value["Date"] as? String else { continue }
            guard let  article = value["Article"] as? String else { continue }


            let post = postStruct(title: title, author: author, date: date, article: article, downloadURL: downloadURL)

            self.posts.append(post)


        }

        self.posts = self.posts.reversed(); self.tableView.reloadData()

    })


}




override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return posts.count
}

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell")

    let label1 = cell?.viewWithTag(1) as! UILabel
    label1.text = posts[indexPath.row].title


    let imageView = cell?.viewWithTag(2) as! UIImageView
    let post = self.posts[indexPath.row];
    imageView.sd_setImage(with: URL(string: post.downloadURL), placeholderImage: UIImage(named: "placeholder"))

 return cell!

}


override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "detail" {
        if let indexPath = tableView.indexPathForSelectedRow {
            let destVC = segue.destination as! ArticleViewController
            destVC.titleText = value["Title"] as? String

        }

    }
}

Answer 1

您只需从您的posts 数组访问相关的postStruct，然后获取标题。您已经有了所选行的索引路径； .row 属性将成为您所需结构的 posts 数组中的索引。

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "detail" {
        if let indexPath = tableView.indexPathForSelectedRow {
            let destVC = segue.destination as! ArticleViewController
            destVC.titleText = posts[indexPath.row].title

        }

    }
}