How to implement UISearchController in iOS8? - swift

Question

I have tried to implement the UISearchController in IOS8 but failed.
The problem is when I have changed the text and the scope button, noting is presented to me.
And it seems that the updateSearchResultsForSearchController function is not even called when I update the search Bar or the scope button.
Here is my code:
class SearchTestController: UITableViewController, UISearchResultsUpdating {
struct Candy {
let category : String
let name : String
}
var searchcontroller = UISearchController(searchResultsController: nil)
func updateSearchResultsForSearchController(searchController: UISearchController) {
filteredcandy = candies.filter() { (candy:Candy) -> Bool in
let scopetest = ( self.category[self.searchcontroller.searchBar.selectedScopeButtonIndex] == "All" ) || ( candy.category == self.category[self.searchcontroller.searchBar.selectedScopeButtonIndex] )
//let texttest = candy.name.rangeOfString(self.searchcontroller.searchBar.text)
//let result = scopetest && (texttest != nil)
return scopetest
}
println(filteredcandy.count)
self.tableView.reloadData()
}
var candies = [Candy]()
var filteredcandy = [Candy]()
var category = ["Chocolate","Hard","Other","All"]
override func viewDidLoad() {
super.viewDidLoad()
// Sample Data for candyArray
self.candies = [Candy(category:"Chocolate", name:"chocolate Bar"),
Candy(category:"Chocolate", name:"chocolate Chip"),
Candy(category:"Chocolate", name:"dark chocolate"),
Candy(category:"Hard", name:"lollipop"),
Candy(category:"Hard", name:"candy cane"),
Candy(category:"Hard", name:"jaw breaker"),
Candy(category:"Other", name:"caramel"),
Candy(category:"Other", name:"sour chew"),
Candy(category:"Other", name:"gummi bear")]
// Reload the table
self.tableView.reloadData()
self.tableView.tableHeaderView = searchcontroller.searchBar
searchcontroller.searchBar.sizeToFit()
searchcontroller.searchBar.showsSearchResultsButton = true
self.definesPresentationContext = true
searchcontroller.searchBar.scopeButtonTitles = category
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if searchcontroller.active {
return self.candies.count
} else {
return self.candies.count
}
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
//ask for a reusable cell from the tableview, the tableview will create a new one if it doesn't have any
let cell = self.tableView.dequeueReusableCellWithIdentifier("Cell") as! UITableViewCell
var candy : Candy
// Check to see whether the normal table or search results table is being displayed and set the Candy object from the appropriate array
if searchcontroller.active {
candy = filteredcandy[indexPath.row]
} else {
candy = candies[indexPath.row]
}
// Configure the cell
cell.textLabel!.text = candy.name
cell.accessoryType = UITableViewCellAccessoryType.DisclosureIndicator
return cell
}

Answer 1

Add the following lines to viewDidLoad()
searchcontroller.searchResultsUpdater = self
searchcontroller.delegate = self
Update:
Add the following line in viewDidLoad()
searchcontroller.searchBar.delegate = self
Then update the search results in searchBar(_:selectedScopeButtonIndexDidChange:)