Say, I have a label show : Loading...
problem: When return from VC(2). The label is not hidden.
How to hide it when return from VC(2) and dont hide it when in navigating to VC(2) and show the message : Loading....
in VC(1)
#IBOutlet weak var lbLoadingMsg
In viewDidLoad() {
lbLoadingMsg.hidden = true
}
-2-- turn it on when prepare to navigate to VC(2)
override func shouldPerformSegueWithIdentifier(identifier: String?, sender: AnyObject?) -> Bool
{
--code--
lbLoadingMsg.hidden = false
}
Override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!){
}
You can use NSNotificationCenter for that.
Follow this simple steps:
1.In your VC(2) add this code into your button from where you are going back:
#IBAction func goBack(sender: AnyObject) {
NSNotificationCenter.defaultCenter().postNotificationName("hide", object: nil)
self.dismissViewControllerAnimated(true, completion: nil)
}
2.In your First View add this code into viewDidLoad method:
override func viewDidLoad() {
super.viewDidLoad()
NSNotificationCenter.defaultCenter().addObserver(self, selector: "hideLabel:", name:"hide", object: nil)
}
now this method will call this function:
func hideLabel(notification: NSNotification){
self.lbLoadingMsg.hidden = true
}
And this will hide your label in first view when ever goBack button will pressed from first view.
Hope this will help you.
Write this in VC2
,
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
var identifier = segue.identifier
if(identifier! == "yourIdentifier"){
var vc1:VC1 = segue.destinationViewController as! VC1
vc1.lbLoadingMsg.hidden = true
}
}
func viewDidAppear(_ animated: Bool) {
lbLoadingMsg.hidden = true
}
Move
lbLoadingMsg.hidden = true
line from viewDidLoad to viewDidAppear. I think most quicker way.
Related
EDIT: I have decided to change the way my app works, so this problem is solved. Thanks to everyone who helped!
I have a modal controller where when I press a button it dismisses the view. What I want to do is change a variable in another view controller when I dismiss it, is that possible? Or, if this doesn't work, is there a way for me to access the changed variable of another swift file? I will add my code below:
class PopupViewController: UIViewController {
var event = ""
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
#IBAction func dismiss(_ sender: Any) {
dismiss(animated: true, completion: nil)
}
#IBAction func event910(_ sender: Any) {
event = "storyTime"
dismiss(animated: true, completion: nil)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let vc = segue.destination as! ViewController
vc.event = event
}
}
I want to pass the changed variable "event" to another view controller, how can I do this?
Delegate View Controller is as follows. : -
it is the place where you will send the data to the next swift file
protocol myprotocol {
func anyfunction(_ param1:String)
}
struct mystruct1 {
var delegate:myprotocol?
// where you want tot start the delegate / send the data to the next file
func anymethod(){
delegate.anyfunction(sendTheDataYouWant)
}
}
// it is here you will receive the data
class anyclass:UIViewController ,myprotocol {
let class1 = mystruct1()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
class1.delegate = self
}
func anyfunction(param1:String){
// here Save the data you want
// because this function will be triggered as delegate will be called
}
}
ps:- I reccomend you to read https://docs.swift.org/swift-book/LanguageGuide/Protocols.html
& apple docs
I have two viewcontrollers setup and set the segue connections as well. I'm attempting to pass data from one of the VC's to the other. Using the below code and using the func override works. What i want to do is only have the override func prepare fire off when a button is pressed and when i paste the override func code into a button action, it doesnt work - the label on the first VC doesnt update - it stays to the default value i set.
First ViewController code:
var testLabel1:String = "default"
#IBOutlet weak var testLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
testLabel?.text = testLabel1
// Do any additional setup after loading the view.
}
Second ViewController code:
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
{
if segue.destination is ViewController
{
let vc = segue.destination as? ViewController
vc?.testLabel1 = "Success"
}
}
Button action that ive tried
#IBAction func actionBtn(_ sender: Any) {
func prepare(for segue: UIStoryboardSegue, sender: Any?)
{
if segue.destination is ViewController
{
let vc = segue.destination as? ViewController
vc?.testLabel1 = "Success"
}
}
}
You need to trigger it with performSegue
class FirstVc:UIViewController {
#IBOutlet weak var lbl:UILabel!
#IBAction func goToSecond(_ sender: Any) {
self.performSegue(withIdentifier:"YourSegueName",sender:nil)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "YourSegueName" {
let vc = segue.destination as! SecondVC
vc.testLabel1 = "Success"
}
}
func setData(_ str:String){
self.lbl.text = str
}
}
class SecondVC:UIViewController {
var testLabel1 = ""
weak var delegate:FirstVc?
func goBack() {
self.delegate?.setData("FromSecond")
self.dismiss(animated: true, completion: nil)
}
}
Struggling to get my viewControllers to send value from the main viewController to a second. I want it to happen on a button click, I'm going to get the value from the button and pass it to the new form. But it just isn't working.
Code for main ViewController
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func butClick(_ sender: UIButton) {
NSLog("Button Pressed : %#",[sender .currentTitle])
//var tt = [sender .currentTitle]
// Create the view controller
let vc = TimesTablesViewController(nibName: "TimesTablesViewController", bundle: nil)
vc.passedValue = "xx"
self.performSegue(withIdentifier: "pushSegue", sender: nil)
}
}
Code for second viewController called TimesTablesViewController:
class TimesTablesViewController: UIViewController {
#IBOutlet weak var titleLabel: UILabel!
var passedValue:String = ""
override func viewDidLoad() {
super.viewDidLoad()
titleLabel?.text = "\(passedValue) Times Table"
}
}
I've followed tutorials but can't seem to solve the problem! Thanks for any help!
Replace
self.performSegue(withIdentifier: "pushSegue", sender: nil)
with
self.present(vc,animated:true,completion:nil)
or ( if the current vc is inside a naigation )
self.navigationController?.pushViewController(vc,animated:true)
Using
self.performSegue(withIdentifier: "pushSegue", sender: nil)
is fit with storyboards not xibs and if this your case then you need to use the above line only inside the button action with implementing this method inside the source vc
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "pushSegue" {
if let nextViewController = segue.destination as? TimesTablesViewController{
nextViewController.passedValue = "xx"
}
}
}
I’m assuming that the new view controller is appearing, but you’re simply not seeing the data. If so, you’re evidently using storyboards. The TimesTablesViewController(nibName:bundle:) only works if you’re using XIB/NIBs and manually presenting new view controller.
If you’re really using storyboards, simplify your butClick method:
#IBAction func butClick(_ sender: UIButton) {
NSLog("Button Pressed")
performSegue(withIdentifier: "pushSegue", sender: self)
}
But implement prepare(for:sender:):
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let destination = segue.destination as? TimesTablesViewController {
destination.passedValue = "xx"
}
}
Assuming the above fixes your problem, I might suggest a further simplification. Notably, if your butClick(_:) method is really only calling performSegue, you can segue to this next scene without any #IBAction method at all:
remove butClick(_:) entirely;
remove the connection between the button and the butClick method in IB, on the “Connections Inspector” tab in the right panel; and
control-drag from the button previously hooked up to butClick(_:) to the scene for TimesTablesViewController.
That will simplify your code further.
I have the following interfaces:
In the table view I set the new values for the user and I would like to call the function to update the data from the server when the button "Done" from the main view is pressed.
How I can do it?
I have tried:
#IBAction func doneTapped(_ sender: Any){
ProfileEditingTableViewController().updateData()
}
But all the text fields from the other view are null because it seems to be a new instance of ProfileEditingTableViewController.
updateData() can't be static.
class ProfileEditingViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func cancelButton(_ sender: Any) {
dismiss(animated: true, completion: nil)
}
#IBAction func doneTapped(_ sender: Any) {
// Here I have to save the data from the other View
dismiss(animated: true, completion: nil)
}
}
class ProfileEditingTableViewController: UITableViewController {
func updateData() {
...
}
}
This line
ProfileEditingTableViewController().updateData()
is incorrect as it creates a new instance, you need to use delegate to access the presented ProfileEditingTableViewController
class ProfileEditingTableViewController: UITableViewController {
var profileInstance: ProfileEditingViewController!
}
When you present information from profile:
let info = //
info.delegate = self // here self is the profile instance
Then use:
profileInstance.updateData()
//
Edit: connect the segue source to the vc itself ( yellow circular icon ) , this inside ( ProfileEditingViewController)
self.performSegue(withIdentifier: "goToNext", sender: nil)
//
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
super.prepare(for: segue, sender: sender)
if segue.identifier == "goToNext" {
let des = segue.destination as! ProfileEditingTableViewController
des.profileInstance = self
}
}
I'm absolute newbie in Swift and OSX development, and I'm sorry if my question will be too noob. I want to understand principles of navigation between NSViewControllers.
I have my default ViewController, where are login and password fields and button to login. After click on button, returns token. And now I trying to change "view" to SecondViewController and save somewhere token, I will need it in future. How can I do it? and it possible to do this in function?:
#IBAction func loginButton(_ sender: Any) {
....
}
Thank you!
You need to use segues to perform this action.
First make the segues connections between the ViewControllers using to storyboard editor. After that you need to give the segues an identifier on the storyboard's attributes inspector. Then in your code you can call the new ViewController by the segue like the code below.
With this code you can pass the data using the button:
class ViewController: NSViewController {
var dataToPass: String = "DataToPass"
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func loginButton(_ sender: Any) {
performSegue(withIdentifier: NSStoryboardSegue.Identifier(rawValue: "segueIdentifier"), sender: self)
}
override func prepare(for segue: NSStoryboardSegue, sender: Any?) {
if segue.identifier!.rawValue == "segueIdentifier" {
let destinationViewController = segue.destinationController as! ViewController2
destinationViewController.dataToReceive = dataToPass
}
}
}
class ViewController2: NSViewController {
var dataToReceive: String
override func viewDidLoad() {
super.viewDidLoad()
}
}
And with this code you will use the override viewWillAppear
class ViewController: NSViewController {
var dataToPass: String = "DataToPass"
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewWillAppear() {
performSegue(withIdentifier: NSStoryboardSegue.Identifier(rawValue: "segueIdentifier"), sender: self)
}
override func prepare(for segue: NSStoryboardSegue, sender: Any?) {
if segue.identifier!.rawValue == "segueIdentifier" {
let destinationViewController = segue.destinationController as! ViewController2
destinationViewController.dataToReceive = dataToPass
}
}
}
class ViewController2: NSViewController {
var dataToReceive: String
override func viewDidLoad() {
super.viewDidLoad()
}
}
In both cases you need to assure the data you want to pass to the other view controller is not null.