Get searchbar text in swift - ios

I want to use search bar in my app. But I couldn't find any tutorial for this.
My question is simple: How can I get search bar text when user preses to enter button ?
I need something like this in my view controller:
override func userPressedToEnter(text: String) {
println("User entered: \(text)")
}
How can I do this in swift ?

Assuming you have a simple search bar in your storyboard, make sure you have it connected as an outlet. Then use this as an example. Use UISearchBarDelegate the reference to learn more about delegate methods available to you.
import UIKit
class ViewController: UIViewController, UISearchBarDelegate {
#IBOutlet var searchBar:UISearchBar!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
searchBar.delegate = self
}
func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {
print("searchText \(searchText)")
}
func searchBarSearchButtonClicked(searchBar: UISearchBar) {
print("searchText \(searchBar.text)")
}
}

I would take a look at the UISearchBarDelegate protocol:
https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UISearchBarDelegate_Protocol/index.html
Make your view controller class conform to this protocol and you will have everything you need to interact with your search bar. Alternatively you can get at the search bar text field but Apple gives you a much cleaner, nicer, event driven way via this protocol.

Assuming you have a tableview that you're searching, add a Search Bar and Search Controller to the tableview in the storyboard. That'll hook up all the data source / delegate connections that you need.
Then in your tableview you can use:
func searchDisplayController(controller: UISearchDisplayController!, shouldReloadTableForSearchString searchString: String!) -> Bool {
doStuffWithSearchText(searchBar.text, scope: 0)
}
which will get called whenever they change the text in the search bar. It's common to update the data that's displayed every time they change the text but if you need to do it only when they tap on the search button use this function instead:
func searchBarSearchButtonClicked(searchBar: UISearchBar) {
doStuffWithSearchText(searchBar.text, scope: 0)
}
And you can get the text from the search results controller:
controller.searchBar.text
Or from the search bar:
searchBar.text
If you're not using a tableview controller:
Add a search bar
Hook up your view controller as the search bar's delegate
Then use the searchBarSearchButtonClicked: function to handle when they tap the "Search" button or searchBar(searchBar: UISearchBar, textDidChange searchText: String) to handle w
I wrote a tutorial on doing it with a table view controller that has all the gritty details: Adding a Search Bar to a Table View in Swift

Related

Delete all the previous UITableViewCell Swift 3/4 iOS

I currently have a UITableViewController that gets populated with a JSON response from the server, all done with Alamofire.
I have my search bar at the top of my TableView, and when I enter a keyword the server responds with the JSON relative to my search. But when I do another search, the previous result of the search still appears.
I would like to know how to clear the previous search from the tableView.
As I mentioned in my comment when user changes the text in UISearch bar simply clear the array that you used to show your tableView and reload the tableView. Lets say my array name is dataSource
extension ViewController : UISearchBarDelegate {
func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
self.dataSource?.removeAll()
self.tableView.reloadData()
}
}
If you want to clear the previous result when user hits search button
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
self.dataSource?.removeAll()
self.tableView.reloadData()
}
Choose whichever suites your need. The basic idea is same. Clear the array and reload thats all :)

UISearchBar searchBarCancelButtonClicked not being called using Swift 3

For some reason when I click the circle x cancel button in a UISearchBar the searchBarCancelButtonClicked event is not firing, it worked in a swift 2 project but not in this swift 3 one.
I am now extending my view controller instead of the inline class way but I believe that is working as the searchBarSearchButtonClicked event does work. Here is what I have so far:
extension MyViewController: UISearchBarDelegate {
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
print("here?")
searchBar.resignFirstResponder()
handleCancelSearch()
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
searchBar.resignFirstResponder()
if let searchText = searchBar.text {
performSearchUsing(term:searchText)
}
}
}
The print is not logged and the function not called. Am I missing something silly?
Maybe you are missing something silly as I did, the "circle x" is not actually the cancel button, and I thought that too, the cancel button comes disabled by default, you can activate it via storyboard on the attributes of the searchBar or you can do it programmatically with:
searchBar.showsCancelButton = true
After that, the method should work.
If any one still looking for the option how act on "X" button. use below method which is available in
UISearchBarDelegate
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String)
{
if searchText.count == 0
{ // Hide content
}
}
Note : it is not cannel button its clear text button which is visible after typing something in searchBar

How to resignfirstResponser on x button action event in uisearch bar?

I am unable to detect x button action in UISearchBar iOS 9. is there anyone can help me?
if your view controller is your search bar delegate, you could implement searchBarCancelButtonClicked function and resignFirstResponder from there.
func searchBarCancelButtonClicked(searchBar: UISearchBar) {
searchBar.text = ""
searchBar.resignFirstResponder()
// or you could force view to end editing mode using self.view.endEditing(true)
}
you can do something like,
func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {
if searchText.characters.count == 0 {
performSelector("hideKeyboardWithSearchBar:", withObject:searchBar, afterDelay:0)
}
}
refer apple documentation for more details
Hope this will help :)
func hideKeyboardWithSearchBar(bar:UISearchBar) {
bar.resignFirstResponder()
}

updateSearchResultsForSearchController not called in iOS 9

I am trying to write a simple UITableView with a UISearchBar. I have no problem when I drag and drop a UITableViewController. Everything works! (see code below)
override func viewDidLoad() {
super.viewDidLoad()
self.searchResultsController = UISearchController(searchResultsController: nil) //initialize the search controller
self.searchResultsController.searchResultsUpdater = self //the search controller updater is this view
self.searchResultsController.dimsBackgroundDuringPresentation = false
self.searchResultsController.searchBar.sizeToFit()
self.searchResultsController.searchBar.searchBarStyle = UISearchBarStyle.Minimal
self.searchResultsController.searchBar.showsCancelButton = true
self.tableView.tableHeaderView = searchResultsController.searchBar
self.tableView.reloadData()
}
But now, for experimental purpose, I used UIViewController, and added a UITableView, no problem with showing my records in the table.
Then, added a UISearchBar from the storyboard, set its delegate to the UIViewController, but the updateSearchResultsForSearchController method is not called when the user type in something.
It's like my UISearchController has no idea there is a UISearchBar, and what ever I type in, does not evoke the updating method. Do I have to tell the UISearchController that hey this is your UISearchBar?
So here's top of my code:
class SearchViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UISearchResultsUpdating, UISearchBarDelegate, UISearchControllerDelegate
{
#IBOutlet weak var mySearchBar: UISearchBar!
#IBOutlet weak var myViewTable: UITableView!
let allElements = ["H", "Li", "Na", "K", "Rb", "Cs", "Fr"]
var filteredElemetns = [String]()
var searchResultsController = UISearchController() //create a new search controller
override func viewDidLoad()
{
super.viewDidLoad()
self.searchResultsController = UISearchController(searchResultsController: nil) //initialize the search controller
self.searchResultsController.searchResultsUpdater = self //the search controller updater is this view
self.searchResultsController.dimsBackgroundDuringPresentation = false
self.searchResultsController.searchBar.sizeToFit()
self.searchResultsController.searchBar.searchBarStyle = UISearchBarStyle.Minimal
self.searchResultsController.searchBar.delegate = self
//self.myViewTable.tableHeaderView = self.searchResultsController.searchBar
}
If I uncomment the last line, then I'll have two UISearchBar, which one is added by the storyboard and the other one with the last line code. The one I added, does not work, but the one at top of the myViewTable does.
Ok, I found the solution.
I used my filtering algorithm inside searchBar:textDidChange function. Then everything worked, and I don't need updateSearchResultsForSearchController function anymore. Here is my code:
func searchBar(searchBar: UISearchBar, textDidChange searchText: String)
{
print("filtering...")
self.filteredElemetns.removeAll(keepCapacity: false) //remove all the elements
let searchPredict = NSPredicate(format: "SELF CONTAINS [c] %#", self.mySearchBar.text!)
print(searchPredict)
let foundElements = (self.allElements as NSArray).filteredArrayUsingPredicate(searchPredict)
self.filteredElemetns = foundElements as! [String]
self.myViewTable.reloadData()
}
Of course, don't forget to make sure your class conforms to UISearchBarDelegate protocol.
I find this approach better than using a UITableViewController. One reason, if you search, you will find that many people have a problem with making UISearchBar the first responder. The only solution to that, I found, is calling becomeFirstResponder after a delay, which is really not a good programming approach.
But, with this approach, you can make an outlet of your UISearchBar and then easy make it the first responder in viewDidAppear.
I know some people might say no you can easily make the UISearchBar the first responder even if you use UISearchResultsController by doing something like:
self.searchResultsController.searchBar.becomeFirstResponder()
self.searchResultsController.active = true
But, believe me in iOS 8/9 it is not that simple, it won't work. Try it...

How to know when search bar text changes [duplicate]

This question already has answers here:
Searching a table view with UISearchBar
(2 answers)
Closed 9 years ago.
I have a search bar and I need to get a notification when the bar text changes, how can I do that? I need to reload the table view every time the string value of the search bar changes
Follow the below steps to get it done
Add Delegate methods for your View Controller
ViewController: UISearchBarDelegate, UISearchDisplayDelegate
Create IBOutlet for your searchBar
#IBOutlet weak var searchBarVar: UISearchBar!
Assign Delegates as self to searchBar in viewDidLoad.
override func viewDidLoad() {
super.viewDidLoad()
searchBarVar.delegate = self
}
Implement the textDidChange delegate method
Swift 4:
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
print("searchText",searchText)
}
ObjC
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText;

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