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