我正在尝试搜索我从Firebase数据库中提取的一组对象。数据加载正常，但当我尝试搜索没有任何节目。我现在只学习iOS / Swift大约6周了。以下是我的代码。
点击进入搜索栏后，应用就崩溃了。 我设法让搜索代码停止崩溃，但我的搜索没有得到任何回报。这是因为我正在搜索Firebase数据库吗？我正在将firebase数据加载到一个数组中，因此它应该可以搜索到吗？
import UIKit
import Firebase
class ServicesTableViewController: UITableViewController, UISearchResultsUpdating {
var services = [Service]()
var filteredSearch = [Service]()
var searchController: UISearchController!
var resultsController = UITableViewController()
override func viewDidLoad() {
super.viewDidLoad()
// Turn this back on to cache data
FIRDatabase.database().persistenceEnabled = true
fetchServices()
self.resultsController.tableView.dataSource = self
self.resultsController.tableView.delegate = self
self.searchController = UISearchController(searchResultsController: self.resultsController)
self.tableView.tableHeaderView = searchController.searchBar
self.searchController.searchResultsUpdater = self
searchController.dimsBackgroundDuringPresentation = false
searchController.searchBar.placeholder = "Search services..."
searchController.searchBar.tintColor = UIColor.white
searchController.searchBar.barTintColor = UIColor(red: 164.0/255.0, green: 45.0/255.0, blue: 9.0/255.0, alpha: 1.0)
navigationItem.backBarButtonItem = UIBarButtonItem(title: " ", style: .plain, target: nil, action: nil)
}
// MARK: - Search Controller
func filterContent(for searchText: String) {
filteredSearch = services.filter({ (service) -> Bool in
if let name = service.name {
let isMatch = name.localizedCaseInsensitiveContains(searchText)
return isMatch
}
return false
})
}
func updateSearchResults(for searchController: UISearchController) {
if let searchText = searchController.searchBar.text {
filterContent(for: searchText)
tableView.reloadData()
}
}
// MARK: Database connection and data fetch
func fetchServices () {
FIRDatabase.database().reference().child("services").observe(.childAdded, with: { (snapshot) in
print(snapshot)
if let dictionary = snapshot.value as? [String: AnyObject] {
let service = Service()
service.setValuesForKeys(dictionary)
self.services.append(service)
self.tableView.reloadData()
}
})
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if searchController.isActive {
return filteredSearch.count
} else {
return services.count
}
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cellIdentifier = "Cell"
let cell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier, for: indexPath) as! ServicesTableViewCell
// Check to see if the user is searching or not
let service = (searchController.isActive) ? filteredSearch[indexPath.row] : services[indexPath.row]
// let service = services[indexPath.row]
cell.programLabel.text = service.name
cell.programLabel.font = UIFont(name: "Avenir-Medium", size: 18.0)
cell.programLabel.textColor = UIColor(red: 0.0/255.0, green: 0.0/255.0, blue: 0.0/255.0, alpha: 1.0)
cell.branchLabel.text = service.branch
cell.branchLabel.font = UIFont(name: "Avenir-Medium", size: 14.0)
cell.branchLabel.textColor = UIColor(red: 90.0/255.0, green: 86.0/255.0, blue: 92.0/255.0, alpha: 1.0)
cell.servicesLabel.text = service.shortDesc
cell.servicesLabel.font = UIFont(name: "Avenir-Light", size: 14.0)
cell.servicesLabel.textColor = UIColor(red: 164.0/255.0, green: 45.0/255.0, blue: 9.0/255.0, alpha: 1.0)
cell.thumbnailImageView.image = UIImage(named: service.imageName!)
return cell
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showServicesDetail" {
if let indexPath = tableView.indexPathForSelectedRow {
let destinationController = segue.destination as! ServicesDetailViewController
destinationController.services = services[indexPath.row]
}
}
}
}
这是我目前的故事板。只有两个视图和一个导航控制器， enter image description here
答案 0 :(得分：0)
我以为你想按名字搜索：
filteredSearch = services.filter { (service: Service) -> Bool in
if let name = service.name,
let searchText = self.searchController.searchBar.text?.lowercased() {
return name.lowercased().contains(searchText)
} else {
return false
}
}
另外，请将filteredSearch更改为Service：
var filteredSearch = [Service]()
答案 1 :(得分：0)
如果您的Service课程如下
class Service: NSObject {
var serviceID: NSInteger!
var serviceName: String!
}
您可以通过
检索包含serviceName的{{1}}过滤服务
self.searchController.searchBar.text希望这有帮助。
答案 2 :(得分：0)
我有一个对象数组（codeDataObjectList）
import Foundation
class CodeDataObject:NSObject{
private var collections:[String]?
private var code: String?
private var shortDescription: String?
private var longDescription: String?
private var sectionName: String?
private var specialtyName: String?
private var chapterName: String?
private var isStarred: Bool?
private var starredListIndex:Int?
private var type: String?
.
.
.
下面的代码可以搜索每个对象中的文本，您可以使用filteredTableData
func updateSearchResults(for searchController: UISearchController) {
filteredTableData.removeAll(keepingCapacity: false)
let searchPredicate = NSPredicate(format: "code CONTAINS[c] %@ OR longDescription CONTAINS[c] %@ OR shortDescription CONTAINS[c] %@", searchController.searchBar.text!, searchController.searchBar.text!, searchController.searchBar.text!)
let array = (self.codeDataObjectList as NSArray).filtered(using: searchPredicate)
filteredTableData = array as! [CodeDataObject]
self.tableView.reloadData()
}