I'm writing a tableview for my search results in iOS.
This is my ViewController:
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var resultArray = NSMutableArray()
#IBOutlet weak var scoreTableView: UITableView!
#IBOutlet weak var inputText: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewWillAppear(_ animated: Bool) {
scoreTableView.reloadData()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return resultArray.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
XXXXXXX
return cell
}
And this is my search and #IBAction func.
func search() -> NSMutableArray{
XXXXXXXXX
return array
}
#IBAction func btnSearch(_ sender: Any) {
resultArray = search()
}
However, after building, my table view is blank. In debugDescription(), I can see that func search() works well and have printed search log.
The resultArray in tableview is not the one in #IBAction. It is empty.
You have to reload data again after changing resultArray.
#IBAction func btnSearch(_ sender: Any) {
resultArray = search()
scoreTableView.reloadData()
}
Update: I just forgot to assign DataSource and Delegate to tableView. I built tableview manually from storyboard.
And I misunderstood that there's need to assign DataSource and Delegate, if I did it in storyboard.
override func viewDidLoad() {
super.viewDidLoad()
scoreTableView.dataSource = self
scoreTableView.delegate = self
Related
I make app with news feed which has to open on other ViewController. But can't pass data via segue.
Viewcontroller with newsfeed
class SecondViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var titlenews = ""
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "newsfeedCell", for: indexPath) as! NewsFeedCell
cell.newsfeed_title.text = self.news?[indexPath.item].headline
cell.newsfeed_topic.text = self.news?[indexPath.item].topic
cell.newsfeed_time.text = timetime(from: (self.news?[indexPath.item].time)!)
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("tableview")
let vc = storyboard?.instantiateViewController(withIdentifier: "newsBody") as? NewsBody
vc?.labeltext = (self.news?[indexPath.item].headline)!
print((self.news?[indexPath.item].headline)!)
self.navigationController?.pushViewController(vc!, animated: true)
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.news!.count
} //number of rows
#IBOutlet weak var tableview: UITableView!
var news: [Newsfeed]? = []
override func viewDidLoad() {
super.viewDidLoad()
getJSON()
}
func getJSON(){
///Here all do right
}
}
Viewcontroller which has to receive data from news feed
class NewsBody: UIViewController {
#IBOutlet weak var testLabel: UILabel!
var labeltext = ""
override func viewDidLoad() {
super.viewDidLoad()
print(labeltext)
testLabel.text = labeltext
}
}
print(labeltext) shows that NewsBody receive empty value or nothing.
But print((self.news?[indexPath.item].headline)!) inside of SecondViewController shows that I try to push proper value.
What I do incorrect between this actions? What wrong with segue and pass of data?
It seems that instantiateViewController(withIdentifier: "newsBody") triggers view load under the hood. It should not (in theory) but it might do just that in your case.
This means that viewDidLoad() will be called before the vc?.labeltext = (self.news?[indexPath.item].headline)! is executed.
I'd recommend you to do the following.
class NewsBody: UIViewController {
#IBOutlet weak var testLabel: UILabel!
var labeltext: String? {
didSet { updateUI() }
}
override func viewDidLoad() {
super.viewDidLoad()
updateUI()
}
private func updateUI() {
testLabel.text = labeltext
}
}
This way if you set the labeltext property after the view is loaded, it will still trigger the UI update. And if you set the labeltext property before the view is loaded, as soon as viewDidLoad() is called.
BTW, you are not using segues here. But even if you do, you can easily use the same method as I proposed, because it allows you to stop thinking about whether property updates will update the UI.
Also please note that I made the property optional. It will allow you to avoid force casts and just do
vc?.labeltext = self.news?[indexPath.item].headline
UILabel.text is also an optional String property, so they will play well together.
what I did so far:
I create a tableView controller with empty rows, and a popup window on another ViewController, the purpose of the popup is to add two data(name - link) to the tableView on one ROW (passing Textfields).
what I want :
when I add a new raw (name - link) click save , I want the data to be stored , when I add other data, create another row .
my problem: when I tray to add more raws, it's always wright over the old one, so no matter how much data I input, the result always be 1 row!
popup VC
#IBOutlet weak var nameP: UITextField!
#IBOutlet weak var linkP: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let SEC: TEstVC = segue.destination as! TEstVC
SEC.add(name: nameP.text!, link: linkP.text!)
}
HomeScreen VC
class TEstVC: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
var names = [String]()
var links = [String]()
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.rowHeight = 100.0
tableView.dataSource = self
tableView.delegate = self
}
func add(name: String, link: String) {
names.append(name)
links.append(link)
}
override func viewWillAppear(_ animated: Bool) {
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return names.count //or links.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! TableViewCell
cell.cell4Name.text = names[indexPath.row]
cell.cell4Link.text = links[indexPath.row]
return cell
}
Move your array declaration to global and call reloadData in your tableView like this:
//Popup
#IBOutlet weak var nameP: UITextField!
#IBOutlet weak var linkP: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let SEC: TEstVC = segue.destination as! TEstVC
SEC.add(name: nameP.text!, link: linkP.text!)
self.tableView.reloadData()
}
Your VC
var names = [String]()
var links = [String]()
class TEstVC: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.rowHeight = 100.0
tableView.dataSource = self
tableView.delegate = self
}
func add(name: String, link: String) {
names.append(name)
links.append(link)
}
override func viewWillAppear(_ animated: Bool) {
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return names.count //or links.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! TableViewCell
cell.cell4Name.text = names[indexPath.row]
cell.cell4Link.text = links[indexPath.row]
return cell
}
Simple, after you add a new item to the datasource (names) you need to reload the tableview.
self.tableView.reloadData()
Well, it looks like you're going to a completely new instance of TestVC every single time. So, it's not overwriting the old line. It's putting a new line in a new instance of TestVC. I infer this because you're calling add(name:link:) in prepareForSegue, which gets called by the storyboard when a new viewController is being put on screen with a segue.
Also, your add(name:link:) method should call tableView.reloadData() if you want it to update the screen.
I have ViewController that contains a UITableView. Data is loaded into that table via the following code:
import UIKit
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UsernameSentDelegate {
#IBOutlet weak var scrollView: UIScrollView!
#IBOutlet weak var receiveUsername: UILabel!
#IBOutlet weak var userEmailText: UILabel!
var userEmail: String?
var communities = [String]() { didSet { communitiesTableView.reloadData()
}
}
var flag = false
#IBOutlet weak var communitiesTableView: UITableView!
#IBAction func unwindToHome(_ segue: UIStoryboardSegue) {
}
//recieves email address from delegate from LoginViewController
func userLoggedIn(data: String) {
userEmailText.text = data
}
override func viewDidLoad() {
super.viewDidLoad()
self.communitiesTableView.delegate = self
self.communitiesTableView.dataSource = self
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.communities.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let title = self.communities[indexPath.row]
let cell = UITableViewCell()
cell.textLabel?.text = title
return cell
}
I then set up 1 prototype cell within the UITableView so I could create a segue to my second view controller, ShowCommunitiesViewController and named this segue, "showCommunitySegue"
In ShowCommunitiesViewController I have a label set up and ready to use as the title of the cell name carried across, named communityName.
In ViewController I have set up the following function to deal with the segue, including the destination variable for the cell title that has been selected.
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
self.performSegue(withIdentifier: "showCommunitySegue", sender: self)
showCommunityController.communityName = //what do I put here?
}
What do I need to put on that last line so showCommunityController.communityName displays the cell title?
Just declare selectedCellTitle as String in your viewController where your cells are.
var selectedCellTitle: String?
This will be the global variable keeping track of the selected cell's title.
Add the following in didSelectRowAt:
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
// Set your global variable to the title
self.selectedCellTitle = self.communities[indexPath.row]
// Trigger your segue
performSegue(withIdentifier: "showCommunitySegue", sender: self)
}
Override prepareforsegue method the following way:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showCommunitySegue" {
// Check if the segue's destination viewcontroller is your viewcontroller
if let showCommunityController = segue.destination as? ShowCommunityViewController {
// Assign the selected title to communityName
showCommunityController.communityName = self.selectedCellTitle
}
}
}
I'm designing an app for my school and I am trying to make a simple directory using a tableview within a view controller. I began by trying to make objects, but then switched to a more simple array, still without any luck. I do not know if it is a problem with the code or with the storyboard. Here is the code for the viewcontroller:
import UIKit
class DirectoryViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var backButton2: UIButton!
#IBOutlet weak var directoryTableView: UITableView!
// #IBOutlet weak var nameLabel: NSLayoutConstraint!
// let searchController = UISearchController(searchResultsController: nil)
// var directoryObjects: NSMutableArray! = NSMutableArray()
var names = ["Teacher 1", "Teacher 2", "Teacher 3"]
override func viewDidLoad() {
super.viewDidLoad()
/*
self.directoryObjects.addObject("Teacher 1")
self.directoryObjects.addObject("Teacher 2")
self.directoryObjects.addObject("Teacher 3")
self.directoryTableView.reloadData()
*/
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
// Mark - tableview
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return 3
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
let directoryCell = self.directoryTableView.dequeueReusableCellWithIdentifier("directoryCell", forIndexPath: indexPath) as! DirectoryTableViewCell
// directoryCell.directoryLabel.text = self.directoryObjects.objectAtIndex(indexPath.row) as? String
directoryCell.directoryLabel.text = names[indexPath.row]
return directoryCell
}
#IBAction func backButton2Tapped(sender: AnyObject) {
self.dismissViewControllerAnimated(true, completion: nil)
}
}
Here is the code for the DirectoryTableViewCell:
import UIKit
class DirectoryTableViewCell: UITableViewCell {
#IBOutlet weak var directoryLabel: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
/*
func directoryTableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
}
*/
}
You have to set the delegates. The easiest way is in the code.
In viewDidLoad add:
directoryTableView.delegate = self
directoryTableView.dataSource = self
This will allow those tableView functions to get called.
I'd also recommend changing:
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return 3
}
to:
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return names.count
}
I have a UITableView (with a Custom class called CellModelAllNames for each row). Each Row has a Label and a button.
My question is: When btn_addRecording (i.e. the '+' button is clicked on any/each of the rows, how do I get the lbl_name.text, the label name shown, and show a pop up in the ViewController itself. I want to get additional information in the pop up and then save all the info (including the lbl_name to a database).
CellModelAllNames for each row layout:
import UIKit
class CellModelAllNames: UITableViewCell {
#IBOutlet weak var lbl_name: UILabel!
#IBOutlet weak var btn_addRecording: UIButton!
#IBAction func btnAction_addRecording(sender: AnyObject) {
println("clicked on button in UITableViewCell")
}
override func awakeFromNib() {
super.awakeFromNib()
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
func setCell(setBabyName: String) {
self.lbl_name.text = setBabyName
}
}
Here's the code of my ViewController:
import UIKit
class SecondViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tbl_allNames: UITableView!
var arrayOfNames: [Name] = [Name]()
override func viewDidLoad() {
super.viewDidLoad()
self.tbl_allNames.delegate = self
self.tbl_allNames.dataSource = self
self.tbl_allNames.scrollEnabled = true
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell:CellModelAllNames = self.tbl_allNames.dequeueReusableCellWithIdentifier("CellModelAllNames") as! CellModelAllNames
let name = arrayOfNames[indexPath.row]
cell.setCell(name.name)
println("in tableView, cellforRowatIndex, returning new cells")
return cell
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return arrayOfNames.count
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
}
}
You can use standard UIKit methods to get the cell and its data:
func tappedButton(sender : UIButton) {
let point = sender.convertPoint(CGPointZero, toView: self.tableView)
let indexPath = self.tableView.indexPathForRowAtPoint(point)!
let name = arrayOfNames[indexPath.row]
// do something with name
}
You can add button action in your ViewController
1) In your function cellForRowAtIndexPath assign button's tag as index (ie. indexPath.row)
cell.btn_addRecording.tag = indexPath.row
2) Add target and action for your button :
cell.btn_addRecording.addTarget(self, action: "buttonPressed:", forControlEvents: .TouchUpInside)
3) Add action in ViewControler (ie. save info in database)
func buttonPressed(button: UIButton!)
{
// Add your code here
let name = arrayOfNames[button.tag]
}