在 Firebase 数据更改上更新 UITableView

Question

所以我试图让表格单元格在任何其他单元格发生更改时自动刷新。我希望我的代码可以一举找到表格数组中的对象，更改值并刷新表格视图，但是由于某种原因，即使我的数组更新了，表格也拒绝立即更新。要查看我的新值，我必须重新启动应用程序或重新打开视图。

这就是我目前正在做的事情：

usersRef.queryOrdered(byChild "contactList/(currentUID!)").queryEqual(toValue: true).observe(.childChanged, with: { (snapshot) in
if let friends = snapshot.value as? [String: AnyObject] {

            //Making a new updated contact

            let name = friends["name"] as! String
            print(name)
            let edit = Contact()
            edit.name = name;
            edit.isSafe = friends["isSafe"] as! Bool
            edit.email = friends["email"] as! String

            //My manager object has a custom array objects called contacts. 
            self.manager.index(withName: name, contact: edit)
            self.tableView.reloadData();
        } else {
            print("Failed to Convert")
        }
    })

}

ContactManager 中的index(withName: String, contact: Contact) 方法：

//This method goes through the contactList to check names to see which contact has a specific name equal to "name", then it uses the "contact" to update that specific child.

    public mutating func index(withName: String, contact: Contact) {
    for iterator in 0 ..< contactList.count {
        if (contactList[iterator].name == withName) {
            contactList[iterator] = contact
        }
    }
}

Answer 1

这是一个常见问题。您在后台线程中调用self.tableView.reloadData()。所有 UI 更改都需要在主线程上进行。像这样。

  DispatchQueue.main.async {
    self.tableView.reloadData();
  }