How to make UITextField behave like a UISearchBar in Swift?

Question

I am working on an new App using UITableView and a UISearchBar in Swift and it's already working fine. But since the final project must have a complete customized searchbar, I had to move to UITextField as the input Outlet because of the customization possibilities.

The problem is that I just can't figure out how to code so that the UITextField behaves like a UISearchBar. Have no idea of how I could filter the UITextField inputs and make the string usable with the UISearchBarDelegate methods.

So anyone could help me out with this?

EDIT: I followed Daniel's help and came up with this code, but it is returning "nil", not working.

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, UITextFieldDelegate {

@IBOutlet weak var txtSearchBar: UITextField!
var searchTxt = ""
let prods = ["água", "terra", "ar", "fogo"]
var searchResults:[String] = []

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    
    txtSearchBar.delegate = self
}


func textFieldDidEndEditing(textField: UITextField) {
    searchTxt = textField.text
    println(searchTxt)
    searchResults = prods.filter({(produtos:String) -> Bool in
        
        let nameMatch = produtos.rangeOfString(self.searchTxt, options: NSStringCompareOptions.CaseInsensitiveSearch)
        
        println(nameMatch)
        return nameMatch != nil})
}

My input was the letters "ar" but it returned "nil", when it shouldn't since one of the array's object is "ar".

Answer 1

With the help of @Daniel T. I managed to solve the problem with the following code:

func textFieldShouldReturn(textField: UITextField) -> Bool {
    isFiltered = true
    searchResults = prods.filter({(coisas:String) -> Bool in
        let stringMatch = coisas.rangeOfString(textField.text)
        return stringMatch != nil

    })
    println(searchResults.description)
    textField.resignFirstResponder()
    table.reloadData()
    return true
}

Thanks @Daniel T.