Delete all the previous UITableViewCell Swift 3/4 iOS - 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 :)

Related

Why searchBarTextDidEndEditing not called?

I have this code:
extension VC : UISearchBarDelegate
{
func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
print("searchBarTextDidEndEditing")
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
// searchBar.resignFirstResponder()
}
}
searchBarCancelButtonClicked has fired when clicked on search , but searchBarTextDidEndEditing has not fire until I call searchBar.resignFirstResponder()
I read a lot of questions and answers about that, but I did not understand why is that happen, and what is resignFirstResponder() do here?
As stated in the documents resignFirstResponder
Notifies this object that it has been asked to relinquish its status as first responder in its window.
Basically this function call tells your input field that it should not be getting any more inputs from the user or the input action is finished for this input field. Thus your searchBarTextField ends it's editing status and searchBarTextDidEndEditing is called.
If you'd like to learn more about what a firstResponder is then you may want to checkout this part of the documentation.
This may be useful to some like myself wondering why similar delegate methods are not firing. Check you have set up all appropriate delegates for example:
searchController.searchResultsUpdater = self
searchController.searchBar.delegate = self

How to clear SearchBar result and show full data in tableview using Swift?

My Scenario, I am loading JSON data into tableview here I am maintaining two segment controller button for single tableview with search-bar. First segment button click to search I can get search result well and if I click segment button two there is also showing same search result. So, when I click segment one to two I need to clear search result and load normal data. Same scenario working well when I click close button within searchBar.
My Code
#IBAction func switchTableviewAction(_ sender: UISegmentedControl) {
switch sender.selectedSegmentIndex {
case 0:
print(“one”)
self.searchResultClear()
currentTableView = sender.selectedSegmentIndex
self.tableView.reloadData()
case 1:
print(“two”)
self.searchResultClear()
currentTableView = sender.selectedSegmentIndex
self.tableView.reloadData()
default:
break;
}
}
// MARK: Search Result Clear working but not clearing result
func searchResultClear() {
//self.searchBar.text = ""
//self.searchBar.showsCancelButton = false
//self.filteredLanguages.removeAll()
//self.tableView.reloadData()
}
Along with clearing search bar, you also need to remove the filtering from data source. By data source, I mean the array of objects you are showing in table view. You must be using a filter function with the filter text. If you want to clear the search bar, you also need to restore the original JSON data (the unfiltered one) and then call reloadData
You just need to call the searchBar textDidChange method with empty text when segment control selection is changed
#IBAction func switchTableviewAction(_ sender: UISegmentedControl) {
switch sender.selectedSegmentIndex {
case 0:
self.searchBar(self.searchBar, textDidChange: "")
case 1:
self.searchBar(self.searchBar, textDidChange: "")
default:
break;
}
}

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

Dismiss UISearchBar keyboard without affecting cancel button

I am trying to reproduce the functionality that can be seen in the contacts app on the iphone. I have a UISearchBar that dismisses the keyboard when the search button is clicked. This however deactivitates the cancel button and it requires 2 touches to activate. On the contacts app it is not deactivated when the search button is clicked and the keyboard is dismissed.
So what I am asking is how to dismiss the keyboard without deactivating the cancel button on the uiSearchBar?
I have tried
func searchBarSearchButtonClicked(searchBar: UISearchBar) {
//Some other code
//I have Tried
//Attempt 1
self.searchBar.endEditing(true)
//Attempt 2
self.searchBar.resignFirstResponder()
//Attempt 3
var textFieldInsideSearchBar = searchBar.valueForKey("searchField") as? UITextField
textFieldInsideSearchBar.endEditing(true)
}
Delegate method parses you searchBar, so you do not have to use self.searchBar, that might be one of the issues. I usually use logic from your "Attempt 2".
You can try to implement this:
func searchBarTextDidEndEditing(_ searchBar: UISearchBar)
And call searchBar.resignFirstResponder().
If it does not work, then try to implement this method and return true:
func searchBarShouldEndEditing(_ searchBar: UISearchBar) -> Bool
If you are using UISearchBar in combination with UISearchDisplatController, then try this method on searchDisplayController:
func setActive(_ visible: Bool, animated animated;: Bool)
It quite bit tricky.
Try,
[self.searchBar resignFirstResponder];
[(UIButton *)[self.searchBar valueForKey:#"_cancelButton"] setEnabled:YES];

Get searchbar text in swift

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

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