I want to refresh my Table View after inserting data in it.
So what I'm doing is I click a button, the buttons opens another View Controller where I insert the data then press a button to add that data to an array(Object) and then It goes back to the Table View Controller, and here I want to swipe to refresh my Table View.
Here is my code:
ViewController.swift
AddProcessador.swift
I'm not exactly sure what you mean by refreshing your table view by swiping.
But I have two ideas that might work for you.
If you have only these two view controllers and you accept that the table view is also reloaded, for example, right at startup (first call of viewDidLoad), this would be a possibility:
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
tableView.reloadData()
}
If you want to refresh the table view only after saving the entries, you could also create a protocol and use it.
// Create the protocol
protocol ReloaderDelegate {
func reloadTableView()
}
// Set up a variable in your AddProcessador view controller
var delegate: ReloaderDelegate?
// Set the delegate to a value when you create the AddProcessador instance in the ViewController
controller = self
// Now you can call the function in your AddProcessador view controller
delegate?.reloadTableView()
As a complete code:
protocol ReloaderDelegate {
func reloadTableView()
}
class AddProcessador: UIViewController {
var delegate: ReloaderDelegate?
// Your IBOutlets
override func viewDidLoad() {
super.viewDidLoad()
// ...
}
#IBAction func addClick(_ sender: Any) {
// 1. Add your new processador
// 2. Reload your table view
delegate?.reloadTableView()
// 3. Go back
navigationController?.popViewController(animated: true)
}
}
class ViewController: UIViewController, ReloaderDelegate {
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
// ...
}
func reloadTableView() {
self.tableView.reloadData()
}
#IBAction func pushAddProcessador() {
let controller = AddProcessador()
controller.delegate = self
navigationController?.pushViewController(controller, animated: true)
}
}
Please excuse me if I have made a mistake somewhere.
I hope I could help you with this somehow.
override func viewDidLoad() {
super.viewDidLoad()
refreshControl?.addAction(UIAction(handler: { _ in
DispatchQueue.main.async {
self.tableView.reloadData()
}
}), for: .primaryActionTriggered)
}
override func numberOfSections(in tableView: UITableView) -> Int {
refreshControl?.endRefreshing() //this can be moved to number of rows in section as well. We just need to tell the control we have data and to stop spinning.
return 1
}
Hi im new in swift and im trying to build a store application, i already build it but i have a problem with only one thing which is , i want to pass the data ( label, image, price label ) to another viewController without using segue. I tried all the method ( delegate, notificationCenter, closure ) but i didn't solve it.
this is a picture for new project i create it to explain what i want to do exactly .
i hope i get the solution because i search alot for it maybe for months but i didn't solve my problem :(
this is my code
passingViewController
import UIKit
extension passingDataViewController : textDelegate {
func sendText(withText: String) {
Label.text = withText
}
}
class receivingDataViewController: UIViewController {
#IBOutlet var label2: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
}
}
receivingDataViewController
import UIKit
extension passingDataViewController : textDelegate {
func sendText(withText: String) {
Label.text = withText
}
}
class receivingDataViewController: UIViewController {
#IBOutlet var label2: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
}
}
You didn't explain how you're creating the new controllers, but here's a simple example that just uses a tab controller. This makes use of a shared singleton to pass around the delegate, but if you're creating each controller programatically, you could update the delegate when you create each new instance.
For this example, I have created a singleton that contains the delegate
import Foundation
class SharedSingleton : NSObject
{
var updateDelegate : UpdateDelegate?
static let sharedInstance = SharedSingleton()
}
And then we define the protocol you're using.
In the passing view, you can define it like this
protocol UpdateDelegate
{
func updateDisplay(text : String)
}
and you use it (in the passing view like this
var sharedInstance = SharedSingleton.sharedInstance
#IBAction func cmdGo(_ sender: Any) {
sharedInstance.updateDelegate!.updateDisplay(text: txtInput.text!)
}
You define the receiving view to use the update protocol
class ReceivingViewController: UIViewController, UpdateDelegate {
and set up the delegate
var sharedInstance = SharedSingleton.sharedInstance
override func viewDidLoad() {
super.viewDidLoad()
// setup the delegate through the shared instance
sharedInstance.updateDelegate = self
}
and then implement the update method
func updateDisplay(text: String) {
lblDisplay.text = text
}
That's it. You may need to update your implementation to change how you share the delegate pointer, but that's the process.
I want to determine the background colour of an imageview when it is tapped and perform an action based on the colour. I cannot fathom the syntax for getting the information from the array in which the imageviews are stored. I have tried the below but it says the stated error. Any help would be appreciated. I am new and I'm sorry if I'm wasting peoples time, I'm learning by making my own app and its throwing up a lot of questions. Kind regards.
'Value of type [UIImageView] has no member backgroundColour.
#IBAction func onTapping() {
if squares.backgroundColor == UIColor.red {
// code
}
}
First you need to set userIteractionEnable on all your UIImageViews
Next change your method signature to:
#IBAction func onTapping(_ sender: UITapGestureRecognizer) {
Then you will need to know which image view you are tapping on by checking the sender view property:
#IBAction func onTapping(_ sender: UITapGestureRecognizer) {
let systemRed = UIView()
systemRed.backgroundColor = .systemRed
if sender.view?.backgroundColor == systemRed.backgroundColor {
print("systemRed")
} else {
print("systemYellow")
}
}
I've successfully parsed an XML file using Swift in XCode, the issue is displaying an array within it.
Here is a sample of the XML file:
<dish>
<type> Breakfast </type>
<title> Recipe Title </title>
<duration> minutes </duration>
<calories> calories </calories>
<ingredients>
<item>Ing. 1</item>
<item>Ing. 2</item>
</ingredients>
<image> image url </image>
<description>
<step> step 1 </step>
<step> step 2 </step>
</description>
</dish>
Here is where the xml file gets called to display the ingredients. However, I realize I'm calling the ingredients tag itself and not iterating through it; so the ingredients displays as empty. I'm not sure how to call each element in the array to display them, I've tried several different ways
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let Storyboard = UIStoryboard(name: "Main", bundle: nil)
let resultsVC = Storyboard.instantiateViewController(withIdentifier: "ResultsViewController") as! ResultsViewController
// Information to be passed to ResultsViewController
resultsVC.getTitle = tableViewDataSource[indexPath.row].title
resultsVC.getDuration = tableViewDataSource[indexPath.row].duration
resultsVC.getIngredients = tableViewDataSource[indexPath.row].ingredients
// Push to next view
self.navigationController?.pushViewController(resultsVC, animated: true)
}
The same is true for the description tag as well. Help is appreciated
I have two arrays: FirstTableArray (include name of brands) and SecondTableArray (include models).
I want to add search through which the model of phone can be found by part of name.
import UIKit
import MessageUI
class FirstTableViewController: UITableViewController {
var FirstTableArray = [String]()
var SecondTableArray = [SecondTable]()
override func viewDidLoad() {
super.viewDidLoad()
self.navigationController?.navigationBar.isTranslucent = false
self.navigationController?.navigationBar.barStyle = .black
self.navigationController?.navigationBar.tintColor = UIColor.white
// First Table Array
FirstTableArray = ["Apple", "Samsung"]
// Second Table Array
SecondTableArray = [
SecondTable(SecondTitle: ["iPhone 5s", "iPhone 6", "iPhone 6s"]),
SecondTable(SecondTitle: ["Galaxy S4", "Galaxy S5", "Galaxy S6"]),
]
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return FirstTableArray.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let Cell = self.tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as UITableViewCell
Cell.textLabel?.text = FirstTableArray[(indexPath as NSIndexPath).row]
return Cell
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let indexPath : IndexPath = self.tableView.indexPathForSelectedRow!
let DestViewController = segue.destination as! SecondTableViewController
let SecondTableArrayTwo = SecondTableArray[(indexPath as NSIndexPath).row]
DestViewController.SecondTableArray = SecondTableArrayTwo.SecondTitle
}
}
Can you help me with this?
I'm working through the same thing today and found this tutorial very easy to follow: https://github.com/codepath/ios_guides/wiki/Search-Bar-Guide
It will take you through the steps of adding the search bar in Interface Builder, setting up the delegate, and including a method to filter the results.
Providing a way for users to search through a collection of items is a fairly common task in iOS projects. A standard interface for implementing search behaviors is the search bar.
There are a few common ways to work with Search Bars:
Directly using a UISearchBar. This is the most bare bones way to use
UISearchBars. This can be extremely flexible if you want to design
and program your own search interface, however does not provide as
many built-in features as the other methods.
Using a UISearchDisplayController to help manage a search interface.
The UISearchDisplayController allows you to present a standard search
interface with built-in animations. This method forces you to display
search results in a table view. - DEPRECATED
Using a UISearchController to help manage a search interface. The
UISearchController is a newer controller (available only in iOS 8+)
that helps you present a search interface using any kind of view to
display the search results.
This guide covers the very basics of working with each of these classes. None of these classes actually implements the "searching" behavior of finding items that match a given query string, since determining which objects match will vary with the domain specific use case (e.g. when searching for "people" you might want to match on just their names, whereas you may want a full-text pre-indexed search when searching through e-mails). You'll have to implement any search/filtering behavior yourself.
Working with UISearchBars directly
At its core, a search bar is nothing more than a glorified text field packaged with a scope control and some animations and a couple of buttons. Each search bar has a delegate that gives you an opportunity to respond to user actions. The most important delegate methods are:
textDidChange - most of the time you'll respond to this event by
updating the displayed set of search results as the user is typing
out a query
searchBarSearchButtonClicked - in some cases if the search operation
is slow (e.g. requires making a slow API call) you'll want to wait
until the user taps the search button before updating the search
results.
Example searching a table
We start out with a single view application with a basic UITableView. You can add a UISearchBar as you would with any other control by dragging one to your view controller in interface builder or by programmatically adding it.
The delegate property of search bar must be set to an object that implements UISearchBarDelegate. Typically you make your view controller implement UISearchBarDelegate and set searchBar.delegate = self in viewDidLoad method.
The code to implement the search behavior is as follows. We maintain an additional array filteredData to represent rows of data that match our search text. When the search text changes we update filteredData and reload our table.
class ViewController: UIViewController, UITableViewDataSource, UISearchBarDelegate {
#IBOutlet weak var tableView: UITableView!
#IBOutlet weak var searchBar: UISearchBar!
let data = ["New York, NY", "Los Angeles, CA", "Chicago, IL", "Houston, TX",
"Philadelphia, PA", "Phoenix, AZ", "San Diego, CA", "San Antonio, TX",
"Dallas, TX", "Detroit, MI", "San Jose, CA", "Indianapolis, IN",
"Jacksonville, FL", "San Francisco, CA", "Columbus, OH", "Austin, TX",
"Memphis, TN", "Baltimore, MD", "Charlotte, ND", "Fort Worth, TX"]
var filteredData: [String]!
override func viewDidLoad() {
super.viewDidLoad()
tableView.dataSource = self
searchBar.delegate = self
filteredData = data
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "TableCell", for: indexPath) as UITableViewCell
cell.textLabel?.text = filteredData[indexPath.row]
return cell
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return filteredData.count
}
// This method updates filteredData based on the text in the Search Box
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
// When there is no text, filteredData is the same as the original data
// When user has entered text into the search box
// Use the filter method to iterate over all items in the data array
// For each item, return true if the item should be included and false if the
// item should NOT be included
filteredData = searchText.isEmpty ? data : data.filter({(dataString: String) -> Bool in
// If dataItem matches the searchText, return true to include it
return dataString.range(of: searchText, options: .caseInsensitive) != nil
})
tableView.reloadData()
}
}
Here's what this looks like when running. Notice that the search results are displayed in the same table, and there is no presentation of a separate search interface.
Example searching a collection view
Since the UISearchBar is quite simple, it can be combined with any abitrary view to build your own search interface. Here's what it might look like paired with a collection view.
The code for this is essentially the same as in the case with table views.
Cancelling out of Search and hiding keyboard
Once user taps on search bar, the keyboard will appear, and you will notice that it won't go away when you tap on X. You can show Cancel button when user taps on search bar, and when user taps on Cancel, hide the keyboard.
There is a nifty searchBarTextDidBeginEditing method for UISearchBarDelegate that gets called when user starts editing search text. You can show Cancel button in that method:
func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
self.searchBar.showsCancelButton = true
}
When user taps on cancel button, delegate's searchBarCancelButtonClicked method gets called. At this point, you can hide the Cancel button, clear existing text in search bar and hide the keyboard like this:
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
searchBar.showsCancelButton = false
searchBar.text = ""
searchBar.resignFirstResponder()
}
Using UISearchControllers (iOS 8+)
A newer way to manage the presentation of a search interface (only available in iOS 8 and above) is via the UISearchController. This controller handles some of the logic and animation of presenting a separate search interface for you while still allowing you to specify how your search results are displayed.
Example searching a table
There is currently no built-in object in the Interface Builder Object Library for a UISearchController. The easiest way to create one is to do it programatically. This also creates a UISearchBar and sets the search controller's searchBar property to it. You can add this search bar to your view hierarchy programatically.
In order to update your search results you'll have to implement the UISearchResultsUpdating protocol and set the search controller's searchResultsUpdater property.
You don't need to implement the UISearchControllerDelegate unless you need to hook into the events around the presentation of the search interface.
Putting it all together the code looks like this. Notice that we have to read the search text from the search bar in updateSearchResultsForSearchController. One other thing to note is that we set this view controller's definesPresentationContext property to true. This means that the search controller should use this view controller's frame (as oppposed to the root view controller) when presenting the search interface. In this case it means that the search interface will expand above the carrier bar.
class ViewController: UIViewController, UITableViewDataSource, UISearchResultsUpdating {
#IBOutlet weak var tableView: UITableView!
let data = ["New York, NY", "Los Angeles, CA", "Chicago, IL", "Houston, TX",
"Philadelphia, PA", "Phoenix, AZ", "San Diego, CA", "San Antonio, TX",
"Dallas, TX", "Detroit, MI", "San Jose, CA", "Indianapolis, IN",
"Jacksonville, FL", "San Francisco, CA", "Columbus, OH", "Austin, TX",
"Memphis, TN", "Baltimore, MD", "Charlotte, ND", "Fort Worth, TX"]
var filteredData: [String]!
var searchController: UISearchController!
override func viewDidLoad() {
super.viewDidLoad()
tableView.dataSource = self
filteredData = data
// Initializing with searchResultsController set to nil means that
// searchController will use this view controller to display the search results
searchController = UISearchController(searchResultsController: nil)
searchController.searchResultsUpdater = self
// If we are using this same view controller to present the results
// dimming it out wouldn't make sense. Should probably only set
// this to yes if using another controller to display the search results.
searchController.dimsBackgroundDuringPresentation = false
searchController.searchBar.sizeToFit()
tableView.tableHeaderView = searchController.searchBar
// Sets this view controller as presenting view controller for the search interface
definesPresentationContext = true
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("TableCell") as UITableViewCell
cell.textLabel?.text = filteredData[indexPath.row]
return cell
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return filteredData.count
}
func updateSearchResultsForSearchController(searchController: UISearchController) {
if let searchText = searchController.searchBar.text {
filteredData = searchText.isEmpty ? data : data.filter({(dataString: String) -> Bool in
return dataString.rangeOfString(searchText, options: .CaseInsensitiveSearch) != nil
})
tableView.reloadData()
}
}
}
Here's what this looks like when running. Notice that unlike in the search display controller example, we are using the same table view to display the search results instead of overlaying of a separate table view. However, unlike when working with just the search bar, we still have the built in animation when transitioning to the search interface.
Also, you get the logic to show Cancel button and hide keyboard when user taps on cancel button for free when you use this.
Example searching a collection view
We can just as easily use the search controller to search a collection view in place. We still have the presentation of a search interface, but unlike when working with the search display controller we are not restricted to using a table view to display the search results.
The code for this is almost the same as when searching the the table view above. The only notable difference is that we had to introduce a placeholder view in interface builder for the search bar since there are still some quirks with placing a search controller's search bar inside a collection view's supplementary view.
class ViewController: UIViewController, UICollectionViewDataSource, UISearchResultsUpdating {
#IBOutlet weak var collectionView: UICollectionView!
#IBOutlet weak var searchBarPlaceholder: UIView!
...
override func viewDidLoad() {
...
searchController.searchBar.sizeToFit()
searchBarPlaceholder.addSubview(searchController.searchBar)
automaticallyAdjustsScrollViewInsets = false
definesPresentationContext = true
}
...
}
Search Bar in Navigation View
A common requirement is to place the search bar inside the navigation bar.
This can be configured programatically in your view controller's viewDidLoad as follows.
When working directly with a search bar:
// create the search bar programatically since you won't be
// able to drag one onto the navigation bar
searchBar = UISearchBar()
searchBar.sizeToFit()
// the UIViewController comes with a navigationItem property
// this will automatically be initialized for you if when the
// view controller is added to a navigation controller's stack
// you just need to set the titleView to be the search bar
navigationItem.titleView = searchBar
Using a search display controller:
searchDisplayController?.displaysSearchBarInNavigationBar = true
Using a search controller:
searchController.searchBar.sizeToFit()
navigationItem.titleView = searchController.searchBar
// By default the navigation bar hides when presenting the
// search interface. Obviously we don't want this to happen if
// our search bar is inside the navigation bar.
searchController.hidesNavigationBarDuringPresentation = false
I would suggest implemeting a UISearchBar and adding your class as a delegate to the UISearchBar and then in the delegates methods you can take the searchbar text and perform the search on the datasouce and then reload the tableview data accordingly
Edit: You can use this tutorial for how to implement UISearchBar on a UITableView
https://www.raywenderlich.com/472-uisearchcontroller-tutorial-getting-started