我有一个连接到Tableview的搜索栏，但我不知道如何使其工作！ 表格视图是“存储器”的表格视图。记忆中包含标题，用户ID，正文，我希望它也能够按标题搜索。 事实是，我正在使用Firebase，但我真的不知道如何在特定用户的特定记忆中进行搜索以及如何从Firebase中获取所有信息。
我尝试了很多代码行，但没有任何效果。我需要帮助！
import UIKit
import Firebase
import FirebaseAuth
import FirebaseDatabase
class MemoryViewController: UIViewController,UITableViewDelegate,UITableViewDataSource, UISearchBarDelegate, UISearchResultsUpdating {
func updateSearchResults(for searchController: UISearchController) {
self.memories = Array.filter({ (array: String) -> Bool in
if array.contains(searchController.searchBar.text!)
{
return true
}
else
{
return false
}
})
self.resultController.tableView.reloadData()
}
var filteredArray = [Memory]()
var searchController = UISearchController()
var resultController = UITableViewController()
@IBOutlet weak var tbl: UITableView!
@IBOutlet weak var searchBar: UISearchBar!
var memories : [Memory] = []
var ref : DatabaseReference!
let sref = Storage.storage().reference()
var lastIndex : Int = 0
var strMode : String = ""
var filteredData = [String]()
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return memories.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let identifier = "iden"
var cell : UITableViewCell? = tableView.dequeueReusableCell(withIdentifier: identifier, for: indexPath)
if cell == nil
{
cell = UITableViewCell(style: UITableViewCell.CellStyle.default, reuseIdentifier: identifier)
}
let temp = memories[indexPath.row]
cell?.textLabel?.text = temp.title
cell?.imageView?.image = temp.image
return cell!
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete
{
let temp = self.memories[indexPath.row]
self.memories.remove(at: indexPath.row)
self.ref.child("MEmories/\(temp.key)").removeValue()
tableView.deleteRows(at: [indexPath as IndexPath], with: .fade)
}
}
override func viewDidLoad() {
super.viewDidLoad()
ref = Database.database().reference()
let rightButton = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(MemoryViewController.barButtonItemClicked(_:)))
self.navigationItem.setRightBarButton(rightButton, animated: true)
// Do any additional setup after loading the view.
self.loadMemories()
self.searchController = UISearchController(searchResultsController: resultController)
tbl.tableHeaderView = self.searchController.searchBar
self.searchController.searchResultsUpdater = self
self.resultController.tableView.delegate = self
self.resultController.tableView.dataSource = self
}
@objc func barButtonItemClicked(_ sender:UIBarButtonItem)
{
print("+ clicked")
let addMemoryViewController = self.storyboard?.instantiateViewController(withIdentifier: "AddMemoryViewController") as! AddMemoryViewController
self.strMode = "newMemory"
self.navigationController?.pushViewController(addMemoryViewController, animated: true)
}
func readFromNSUSerDefault()-> Memory
{
let d : UserDefaults = UserDefaults.standard
let strTitle = d.object(forKey: "title") as? String
let strBody = d.object(forKey: "body") as? String
let strImageRef = d.object(forKey: "imageRef") as? String
let uid = d.object(forKey: "uid") as? String
let imageData = d.object(forKey: "imageData") as? Data
let key = d.object(forKey: "key") as? String
let m = Memory(title: strTitle!, body: strBody!, key: key!, uid: uid!, imageRef: strImageRef!)
m.image = UIImage(data: imageData!)
m.key = key!
return m
}
override func viewDidAppear(_ animated: Bool) {
let d = UserDefaults.standard
let newMemory = readFromNSUSerDefault()
let userAdded = d.bool(forKey: "userAdded") //key new user = true
let userEdited = d.bool(forKey: "userEdited")//key user edited = true
if self.strMode == "newMemory" && userAdded
{
self.memories.append(newMemory)
self.tbl.reloadData()
}
else if self.strMode == "edit" && userEdited
{
memories[lastIndex] = newMemory
self.tbl.reloadData()
}
d.set(false, forKey: "userAdded")
d.set(false, forKey: "userEdited")
d.synchronize()
self.strMode = " "
}
func loadMemories()
{
self.ref.child("MEmories").queryOrderedByKey().observe(.value, with: {
snapShot in
if let dict = snapShot.value as? NSDictionary
{
for d in (dict as? Dictionary<String,AnyObject>)!
{
let title = d.value["title"] as?String
let body = d.value["body"] as? String
let uid = d.value["uid"] as? String
let imageRef = d.value["imageRef"] as? String
let m = Memory(title: title!, body: body!, uid: uid!,imageRef:imageRef!)
m.key = d.key
let tempImageRef = self.sref.child(m.imageRef)
tempImageRef.getData(maxSize: 1*1024*1024, completion: {(data,error) in
if error == nil
{
if let imageData = data
{
m.image = UIImage(data: imageData)
self.memories.append(m)
self.tbl.reloadData()
}
}
})
}
}//end of if
self.ref.child("MEmories").removeAllObservers()
})
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let identifier = segue.identifier
{
if identifier == "goToEdit"
{
let indexPath = self.tbl.indexPathForSelectedRow
let addMemoryViewController = segue.destination as! AddMemoryViewController
self.strMode = "edit"
self.lastIndex = (indexPath?.row)!
addMemoryViewController.mode = self.strMode
addMemoryViewController.current = memories[(indexPath?.row)!]
}
}
}
}
答案 0 :(得分：0)
根据评论，该问题与Firebase并不直接相关，但原始发帖人正在询问此问题
我想按内存标题过滤代码，但我仍然 卡住...有什么想法吗？ – ABM
因此，这是一个完整示例，说明如何按内存标题过滤代码。
让我们从一个简单的类开始，该类用于保存内存及其标题
class MemoryClass {
var title = ""
init(withTitle: String) {
self.title = withTitle
}
}
然后，我们将构建一个数组，该数组将用作例如tableView dataSource
let m0 = MemoryClass(withTitle: "Gone Fishing")
let m1 = MemoryClass(withTitle: "Wedding")
let m2 = MemoryClass(withTitle: "France Vacation")
let m3 = MemoryClass(withTitle: "Italy Vacation")
let memoriesArray = [m0, m1, m2, m3]
，然后是按标题查找内存的代码。在这种情况下，我们要查找标题为“ Wedding”的内存
let memoryTitleToFind = "Wedding"
let filteredArray = memoriesArray.filter { $0.title == memoryTitleToFind }
并验证是否找到了内存，让我们遍历找到的内存。请记住，如果有几个标题为“ Wedding”的内存，那么它将把它们全部过滤到过滤后的数组中
for foundMemory in filteredArray {
print(foundMemory.title)
}
并且显示过滤结果的输出是
Wedding
我为此答案创建了一个简单的MemoryClass，在您的问题中，您还注意到其他属性
内存具有标题，用户ID，正文，我也希望它也能够搜索 按标题
因此可以将它们添加到类中并以相同的方式进行过滤。