我有一个 ViewController,其中从 RealtimeDatabase
获取数据列表并显示在 UITableView
中。单击帖子时,我希望将 ViewController
中的数据(例如标题、描述和图像)传送到 DetailView 中,即:PostController.Swift
进一步调用 RealtimeDatabase
中的更多数据以显示在 PostController.Swift
我尝试使用 didSelectRowAt 但无法在 PostController 中获取和显示数据,我目前也在尝试使用 prepare 但卡在同一个地方。
这是 ViewController.Swift
:
import UIKit
import Firebase
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var tableView:UITableView!
var posts = [Post]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
tableView = UITableView(frame: view.bounds, style: .plain)
view.addSubview(tableView)
let cellNib = UINib(nibName: "PostTableViewCell", bundle: nil)
tableView.register(cellNib, forCellReuseIdentifier: "postCell")
var layoutGuide:UILayoutGuide!
layoutGuide = view.safeAreaLayoutGuide
tableView.leadingAnchor.constraint(equalTo: layoutGuide.leadingAnchor).isActive = true
tableView.topAnchor.constraint(equalTo: layoutGuide.topAnchor).isActive = true
tableView.trailingAnchor.constraint(equalTo: layoutGuide.trailingAnchor).isActive = true
tableView.bottomAnchor.constraint(equalTo: layoutGuide.bottomAnchor).isActive = true
tableView.delegate = self
tableView.dataSource = self
tableView.tableFooterView = UIView()
tableView.reloadData()
observePosts()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func observePosts() {
let postsRef = Database.database().reference().child("Data")
postsRef.observe(.value, with: { snapshot in
var tempPosts = [Post]()
for child in snapshot.children{
if let childSnapshot = child as? DataSnapshot,
let dict = childSnapshot.value as? [String:Any],
let title = dict["title"] as? String,
let logoImage = dict["image"] as? String,
let url = URL(string:logoImage),
let description = dict["description"] as? String{
let userProfile = UserProfile(title: title, photoURL: url)
let post = Post(id: childSnapshot.key, title: userProfile, description: description, image: userProfile)
print(post)
tempPosts.append(post)
}
}
self.posts = tempPosts
self.tableView.reloadData()
})
}
func getImage(url: String, completion: @escaping (UIImage?) -> ()) {
URLSession.shared.dataTask(with: URL(string: url)!) { data, response, error in
if error == nil {
completion(UIImage(data: data!))
} else {
completion(nil)
}
}.resume()
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return posts.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
let cell = tableView.dequeueReusableCell(withIdentifier: "postCell", for: indexPath) as! PostTableViewCell
cell.set(post: posts[indexPath.row])
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
tableView.estimatedRowHeight = 50
return UITableViewAutomaticDimension
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "PostDetailSegue" {
if let indexPaths = self.tableView!.indexPathForSelectedRow{
}
}
}
}
最佳答案
您需要在 DetailViewController
中存储对 Post
的引用。
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "PostDetailSegue" {
let detailViewController = segue.destinationViewController as! DetailViewController
let indexPath = tableView.indexPathForSelectedRow
let post = posts[indexPath.row]
detailViewController.setPost(post)
}
}
在你的 DetailViewController 中:
func detailViewController.setPost(_ post: Post) {
// Store the post and fetch other data as necessary
self.post = post
}
关于iOS + Firebase - 将数据从 View Controller 发送到详细 View Controller ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53152747/