Why does my SearchController only match the first character? - ios

Question

I have Data in Dictionary format like this:
var data: [[String:AnyObject]] =
[
[
"id": "1",
"title": "A Title",
"Detail": "This is a String"
],
[
"id": "2",
"title": "A Title Again",
"Detail": "This is a String"
]
]
and my TableViewController lists all "title" data.
I am implementing a SearchController for user to search for a specific data from the "title" only.
My code seems to display results matching just the first character from the search query.
For example: if user inputs "A", all the title results with "A" are displayed but if user goes ahead with "A " (with a space), everything in the searchResult disappears.
Here's my attempt:
class TVC: UITableViewController, UISearchResultsUpdating {
let Search = data
var filteredSearch = [[String:AnyObject]]()
var resultSearchController = UISearchController()
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if (self.resultSearchController.active)
{
return self.filteredSearch.count
}
else
{
return self.Search.count
}
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as UITableViewCell?
if (self.resultSearchController.active)
{
cell!.textLabel?.text = (filteredSearch[indexPath.row]["title"] as! String)
return cell!
}
else
{
cell!.textLabel?.text = (Search[indexPath.row]["title"] as! String)
return cell!
}
}
func updateSearchResultsForSearchController(searchController: UISearchController)
{
self.filteredSearch.removeAll(keepCapacity: false)
let searchPredicate = NSPredicate(format: "SELF CONTAINS[c] %#", searchController.searchBar.text!)
let array = (self.Search as NSArray).filteredArrayUsingPredicate(searchPredicate)
self.filteredSearch = array as! [[String:AnyObject]]
self.tableView.reloadData()
}

Answer 1

You got your predicate wrong. The way it is setup now, self in predicate refers to the objects in an array which are dictionaries, and dictionaries don't have substrings :) In order to make it work, we have to tell the predicate to check value under specific key. This can be done in two ways :
let searchPredicate = NSPredicate(format: "title CONTAINS[c] %#", searchController.searchBar.text!)
// OR
let searchPredicate = NSPredicate(format: "SELF[\"title\"] CONTAINS[c] %#", searchController.searchBar.text!)
This way, the predicate will check the value under title key if it contains the text from the search bar.
I do not know why it worked with single letter though.