当我使用Celll(Swift)时,索引不在范围内



人,当我尝试从不同单元格的图像时,我有这个问题(线程1:致命错误:索引超出范围)

我在这里做什么?我正在尝试构建一个Instagram克隆,在我的家庭视图控制器中,应该出现帖子。我用表视图进行导航,该表视图具有2个带有不同标识符的单元格。单元格1是一个标题,将数据从用户表带到我的用户名标签和配置文件图像。和Cell Number 2 ITS帖子应带来图像和标题之类的帖子数据。我使用firebase数据库。

我的代码:

import UIKit
import FirebaseAuth
import FirebaseDatabase
class HomeViewController: UIViewController ,UITableViewDelegate  {

    @IBOutlet weak var tableview: UITableView!
    var posts = [Post]()
    var users = [UserD]()
    override func viewDidLoad() {
        super.viewDidLoad()
        tableview.dataSource = self
        loadposts()
        userDetal()
     //   var post = Post(captiontxt: "test", photoUrlString: "urll")
     //   print(post.caption)
     //   print(post.photoUrl)
    }
    func loadposts() {
        Database.database().reference().child("posts").observe(.childAdded){ (snapshot: DataSnapshot)in
            print(Thread.isMainThread)
              if let dict = snapshot.value  as? [String: Any]{
                let captiontxt = dict["caption"] as! String
                let photoUrlString = dict["photoUrl"] as! String
               let post = Post(captiontxt: captiontxt, photoUrlString: photoUrlString)
                self.posts.append(post)
                print(self.posts)
                self.tableview.reloadData()
            }
        }
    }
    func userDetal() {
        Database.database().reference().child("users").observe(.childAdded){ (snapshot: DataSnapshot)in
            print(Thread.isMainThread)
            if let dict = snapshot.value  as? [String: Any]{
                let usernametxt = dict["username"] as! String
                let profileImageUrlString = dict["profileImageUrl"] as! String
                let user = UserD(usernametxt: usernametxt, profileImageUrlString: profileImageUrlString)
                self.users.append(user)
                print(self.users)
                self.tableview.reloadData()
            }
        }
    }
    @IBAction func logout(_ sender: Any) {
        do {
            try Auth.auth().signOut()
        }catch let logoutErrorr{
            print(logoutErrorr)
        }
        let storyboard = UIStoryboard(name: "Start", bundle: nil)
        let signinVC = storyboard.instantiateViewController(withIdentifier: "SigninViewController")
        self.present(signinVC, animated: true, completion: nil)

    }
}
extension HomeViewController: UITableViewDataSource{
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return posts.count
    }
    func numberOfSections(in tableView: UITableView) -> Int {
        return users.count
    }
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        if indexPath.row == 0{
         let cell = tableview.dequeueReusableCell(withIdentifier: "imagecell", for: indexPath) as! PostCellTableViewCell
        cell.postimage.image = nil
        cell.tag += 1
        let tag = cell.tag
        cell.captionLabel.text = posts[indexPath.row].caption
        let photoUrl = posts[indexPath.row].photoUrl
        getImage(url: photoUrl) { photo in
            if photo != nil {
                if cell.tag == tag {
                    DispatchQueue.main.async {
                        cell.postimage.image = photo
                    }
                }
            }
        }
        return cell
        } else if indexPath.row == 1 {
            let cell = tableview.dequeueReusableCell(withIdentifier: "postcell", for: indexPath) as! HeaderTableViewCell
            cell.userimage.image = nil
            cell.tag += 1
            let tag = cell.tag
            cell.usernamelabel.text = users[indexPath.row].username 
            //Error showing here????????????????????????????????????
            let profileImageUrl = users[indexPath.row].profileImageUrl
            getImage(url: profileImageUrl) { photo in
                if photo != nil {
                    if cell.tag == tag {
                        DispatchQueue.main.async {
                            cell.userimage.image = photo

                        }
                    }
                }
            }
            return cell
        }
        return UITableViewCell()
    }

    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()
}
}

尝试这个。

cell.tag = indexpath.row

用户数组的内容是什么?

您确定要定义与用户或数量多数行一样多的部分?在这种情况下,使用

func numberOfRows(in tableView: NSTableView) -> Int {
    return users.count
}

如所述,您需要完全重写CellForrowat

应该看起来像这样:

func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
    if row < users.count {
        let user = users[row]
        if let cellView = tableView.makeView(withIdentifier: NSUserInterfaceItemIdentifier(rawValue: "CellID"), owner: self) {
            (cellView as! NSTableCellView).textField?.stringValue = user.name
            // do the same for all the fields you need to set
            return cellView
        } else {
            return nil
        }
    }
    return nil
}

thanx,我的朋友,我找到了一种包含我的单元格的好方法。对于邮政单元格,我只使用cellForRowAt和邮政数据。对于标题单元格,我使用viewForHeaderInSection但是我的用户数据使用heightForHeaderInSection。使视图

使高高

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