Currently I'm trying to set up a search bar for my tableView. I want to filter the user's input with NSPredicate to display filtered data from an array of struct objects.
But when I try to call .filteredArrayUsingPredicate()
on such an array, I get the following error [Course] is not convertible to 'NSArray'
.
Below is my code and a link to the repo. I'm also open to any better methods of approach.
import UIKit
import SwiftyJSON
class CourseTableViewController: UITableViewController, UISearchResultsUpdating {
var allCourses: [Course] = [Course]()
var searchArray: [Course] = [Course]() {
didSet {
self.tableView.reloadData()
}
}
var resultSearchController = UISearchController()
override func viewDidLoad() {
super.viewDidLoad()
retrieveCourses()
configureView()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func configureView() {
tableView.rowHeight = 50
// Search Controller Initialization
self.resultSearchController = UISearchController(searchResultsController: nil)
resultSearchController.searchResultsUpdater = self
resultSearchController.hidesNavigationBarDuringPresentation = false
resultSearchController.dimsBackgroundDuringPresentation = false
resultSearchController.searchBar.searchBarStyle = .Minimal
resultSearchController.searchBar.sizeToFit()
self.tableView.tableHeaderView = resultSearchController.searchBar
}
func retrieveCourses() {
APIService.getAllCourses() { (data) -> Void in
for courseIndex in data {
var course: Course = Course(courseJSON: courseIndex.1)
self.allCourses.append(course)
println("Course Index: " + String(self.allCourses.count))
}
self.sortAllCourses()
}
}
func sortAllCourses() {
allCourses.sort() {$0.abbr < $1.abbr}
self.tableView.reloadData()
}
// MARK: - Search
func updateSearchResultsForSearchController(searchController: UISearchController) {
self.searchArray.removeAll(keepCapacity: false)
let searchPredicate = NSPredicate(format: "SELF CONTAINS[c] %@", searchController.searchBar.text)
// ERROR is on this line
let filteredArray: Array = (allCourses as NSArray).filteredArrayUsingPredicate(searchPredicate)
self.searchArray = filteredArray as [Course]
}
// Full tableView code can be found in the repo
}
Link: https://github.com/classmere/app/tree/feature/issue/1/implementSearch
Many Thanks!
So after much looking around, I found that a better approach for a situation like this would be to simply use .filter() and .rangeOfString() to solve this
While NSPredicate is not used, this appears to be a much easier implementation for my current setup.