I'm following a ResearchKit tutorial in swift (http://www.raywenderlich.com/104575/researchkit-tutorial-with-swift) and I can't connect either of my IBaction methods to buttons in the main storyboard. Here's the code (from the tutorial):
import ResearchKit
class ViewController: UIViewController {
#IBAction func consentTapped(sender : AnyObject) {
let taskViewController = ORKTaskViewController(task: ConsentTask, taskRunUUID: nil)
taskViewController.delegate = self
presentViewController(taskViewController, animated: true, completion: nil)
}
#IBAction func surveyTapped(sender : AnyObject) {
let taskViewController = ORKTaskViewController(task: SurveyTask, taskRunUUID: nil)
taskViewController.delegate = self
presentViewController(taskViewController, animated: true, completion: nil)
}
}
extension ViewController : ORKTaskViewControllerDelegate {
func taskViewController(taskViewController: ORKTaskViewController, didFinishWithReason reason: ORKTaskViewControllerFinishReason, error: NSError?) {
taskViewController.dismissViewControllerAnimated(true, completion: nil)
}
}
I go into the main storyboard and click on the View Controller, and I've tried setting my class both to ViewController and UIViewController, and the methods are supposed to show up in Sent Events, but they don't. I've also tried ctrl dragging, and that hasn't worked for me either.
The issue was that I was not ctrl-dragging from my button directly to the yellow view controller button while the view controller class was set to the class where my IBaction methods were.
You can change the #IBAction's argument from (_ sender: Any) to (_ sender: AnyObject), but manually.
And try to use Ctrl+Drag, please.
It might work.
Related
I've followed the instructions here but I'm still unsure about this part:
modalVC.delegate=self;
self.presentViewController(modalVC, animated: true, completion: nil)
I've tried instantiating the view controller programmatically but still to no avail.
here's my code for when dismissing the modal view controller:
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
self.dismiss(animated: true) {
//
}
}
I'm using storyboard to segue with modal view.
This is the data I wish to transfer back to the parent view controller:
var typeState = "top"
var categoryState = "casual"
Which are two String values.
I've tried to pass data from the modal view controller as shown:
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
self.dismiss(animated: true, completion: nil)
delegate?.sendValue(value: "success")
if let presenter = presentingViewController as? OOTDListViewController {
presenter.receivedValue = "test"
}
}
whereas on the parent view controller I did as such:
func sendValue(value: NSString) {
receivedValue = value as String
}
#IBAction func printReceivedValue(_ sender: UIButton) {
print(receivedValue)
}
I still couldnt receive any value when I hit the print button.
Modal view controller:
protocol ModalViewControllerDelegate
{
func sendData(typeState: String, categoryState: String)
}
var delegate:ModalViewControllerDelegate!
var typeState = "top"
var categoryState = "casual"
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
self.dismiss(animated: true, completion: nil)
delegate?.sendData(typeState: typeState as String, categoryState: categoryState as String)
}
Parent view controller:
class parentViewController: UICollectionViewController, ModalViewControllerDelegate {
var typeState: String?
var categoryState: String?
func sendData(typeState: String, categoryState: String) {
self.typeState = typeState as String
self.categoryState = categoryState as String
}
#IBAction func printReceivedValue(_ sender: UIButton) {
print(typeState)
}
Here's my new code without using delegate method:
Modal view Controller:
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
self.dismiss(animated: true, completion: nil)
if let presenter = presentingViewController as? OOTDListViewController {
presenter.typeState = typeState
presenter.categoryState = categoryState
}
}
OOTDListViewController:
#IBAction func presentModalView(_ sender: UIBarButtonItem) {
let modalView = storyboard?.instantiateViewController(withIdentifier: "filterViewController") as! ModalViewController
let navModalView: UINavigationController = UINavigationController(rootViewController: modalView)
self.present(navModalView, animated: true, completion: nil)
}
#IBAction func printValue(_ sender: UIButton) {
print(typeState)
print(categoryState)
}
Depending on the data you want to pass, you can create a property in the presenting view controller, which you can set when dismissing the modal view controller, so you can spare yourself the delegate.
For example, you have a ContactsViewController, holding a var contacts: [Contact] = [] property. When you want to create a new contact, you present a modal view controller with the different values you need to create a new Contact object. When you are done and want to dismiss the view controller, you call the function as you did in your code, but set the property in the ContactsViewController. It will look something like this:
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
if let presenter = presentingViewController as? ContactsViewController {
presenter.contacts.append(newContact)
}
dismiss(animated: true, completion: nil)
}
If you don't want to use a delegate, this is how you go about it:
In your OOTDListViewController :
var testValue: String = ""
#IBAction func printReceivedValue(_ sender: UIButton) {
print(testValue)
}
In your modal view controller (I'll call it PresentedViewController) :
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
// if your OOTDListViewController is part of a UINavigationController stack, this check will probably fail.
// you need to put a breakpoint here and check if the presentingViewController is actually a UINavigationController.
// in that case, you will need to access the viewControllers variable and find your OOTDListViewController
if let presenter = presentingViewController as? OOTDListViewController {
presenter.testValue = "Test"
}
dismiss(animated: true, completion: nil)
}
If you want to use a delegate, this is how to do it:
In your OOTDListViewController:
protocol ModalDelegate {
func changeValue(value: String)
}
class OOTDListViewController: ModalDelegate {
var testValue: String = ""
#IBAction func presentViewController() {
// here, you either create a new instance of the ViewController by initializing it, or you instantiate it using a storyboard.
// for simplicity, I'll use the first way
// in any case, you cannot use a storyboard segue directly, bevause you need access to the reference of the presentedViewController object
let presentedVC = PresentedViewController()
presentedVC.delegate = self
present(presentedVC, animated: true, completion: nil)
}
func changeValue(value: String) {
testValue = value
print(testValue)
}
}
In your PresentedViewController:
class PresentedViewController {
var delegate: ModalDelegate?
var testValue: String = ""
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
if let delegate = self.delegate {
delegate.changeValue(testValue)
}
dismiss(animated: true, completion: nil)
}
}
If using a navigation controller you will have to first grab the UINavigation Controller and then get the correct ViewController from the Navigation Controller stack.
Here's how my code looked in that case.
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
if let navController = presentingViewController as? UINavigationController {
let presenter = navController.topViewController as! OOTDListViewController
presenter.testValue = "Test"
}
dismiss(animated: true, completion: nil)
}
I am using the a tab bar so the working code is as below:
if let tabBar = self.presentingViewController as? UITabBarController {
let homeNavigationViewController = tabBar.viewControllers![0] as? UINavigationController
let homeViewController = homeNavigationViewController?.topViewController as! HomeController
homeViewController._transferedLocationID = self.editingLocationID!
}
You need to call the delegate method in dismissViewController method
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
delegate?.sendData(typeState: "top", categoryState: "casual")
self.dismiss(animated: true) {
//
}
}
in you Modal ViewController class create delegate
weak var delegate: MyProtocol?
create a protocol with the method name sendData in MyProtocol and in your presentingViewController where you are assigning the delegate, implement the MyProtocol method
protocol MyProtocol: AnyObject {
func sendData(typeState: String, categoryState: String)
}
class ViewController: UIViewController, MyProtocol {
var typeState: String?
var categoryState: String?
override func viewDidApear() {
super.viewDidApear()
presentNewModalVC()
}
func presentNewModalVC() {
let modalVC = NewModalViewControllerToBePresented()
modalVC.delegate = self
present(modalVC, animated: true)
}
func sendData(typeState: String, categoryState: String) {
self.typeState = typeState
self.categoryState = categoryState
}
}
I'm trying to make a function for my navigation without having to type the exact same lines over and over again.
Trying to do so results into an error: "Use of undeclared type 'viewController'"
Am I doing this completely wrong, should I just place these 4 lines on every button just with different identifier and viewController?
func navigateTo(identifier:String, viewController:UIViewController) {
let newVC = storyboard?.instantiateViewController(withIdentifier: identifier) as! viewController
newVC.modalPresentationStyle = .fullScreen
newVC.modalTransitionStyle = .flipHorizontal
self.present(newVC, animated: true, completion: nil)
}
#IBAction func btnOneTapped(_ sender: Any) {
navigateTo("myVC", MyViewController)
}
Make sure you provide correct identifier...below code works perfectly.
Your Error -> Trying to do so results into an error: "Use of undeclared type 'viewController'"
In this there is a typo mistake for ViewController i.e you are trying this - viewController
Also always try to do Optional-Binding instead to force-unwarpping it may cause crash in your app.
func navigateTo(identifier:String, viewController:UIViewController) {
if let newVC = storyboard?.instantiateViewController(withIdentifier: identifier) {
newVC.modalPresentationStyle = .fullScreen
newVC.modalTransitionStyle = .flipHorizontal
self.present(newVC, animated: true, completion: nil)
}
}
#IBAction func confirmBtn(_ sender: UIButton) {
navigateTo(identifier: "myVC", viewController: MyViewController())
}
You are passing an instance of UIViewController and trying to cast the UIViewController to it in the next line. Modify your function to take in ViewController.Type as parameter like this:
func navigateTo<ViewController: UIViewController>(identifier: String, viewController: ViewController.Type) {
let newVC = storyboard?.instantiateViewController(withIdentifier: identifier) as! ViewController
newVC.modalPresentationStyle = .fullScreen
newVC.modalTransitionStyle = .flipHorizontal
self.present(newVC, animated: true, completion: nil)
}
#IBAction func btnOneTapped(_ sender: Any) {
navigateTo(identifier: "myVC", viewController: MyViewController.self)
}
Thank you guys, I've got it working like so:
func navigateToVC(identifier:String, viewController:ViewController.Type) {
let newVC = storyboard?.instantiateViewController(withIdentifier: identifier) as! ViewController
newVC.modalPresentationStyle = .fullScreen
newVC.modalTransitionStyle = .flipHorizontal
self.present(newVC, animated: true, completion: nil)
}
#IBAction func btnOneTapped(_ sender:Any) {
navigateToVC(identifier: "myVC", viewController: MyViewController.self)
}
I've followed the instructions here but I'm still unsure about this part:
modalVC.delegate=self;
self.presentViewController(modalVC, animated: true, completion: nil)
I've tried instantiating the view controller programmatically but still to no avail.
here's my code for when dismissing the modal view controller:
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
self.dismiss(animated: true) {
//
}
}
I'm using storyboard to segue with modal view.
This is the data I wish to transfer back to the parent view controller:
var typeState = "top"
var categoryState = "casual"
Which are two String values.
I've tried to pass data from the modal view controller as shown:
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
self.dismiss(animated: true, completion: nil)
delegate?.sendValue(value: "success")
if let presenter = presentingViewController as? OOTDListViewController {
presenter.receivedValue = "test"
}
}
whereas on the parent view controller I did as such:
func sendValue(value: NSString) {
receivedValue = value as String
}
#IBAction func printReceivedValue(_ sender: UIButton) {
print(receivedValue)
}
I still couldnt receive any value when I hit the print button.
Modal view controller:
protocol ModalViewControllerDelegate
{
func sendData(typeState: String, categoryState: String)
}
var delegate:ModalViewControllerDelegate!
var typeState = "top"
var categoryState = "casual"
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
self.dismiss(animated: true, completion: nil)
delegate?.sendData(typeState: typeState as String, categoryState: categoryState as String)
}
Parent view controller:
class parentViewController: UICollectionViewController, ModalViewControllerDelegate {
var typeState: String?
var categoryState: String?
func sendData(typeState: String, categoryState: String) {
self.typeState = typeState as String
self.categoryState = categoryState as String
}
#IBAction func printReceivedValue(_ sender: UIButton) {
print(typeState)
}
Here's my new code without using delegate method:
Modal view Controller:
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
self.dismiss(animated: true, completion: nil)
if let presenter = presentingViewController as? OOTDListViewController {
presenter.typeState = typeState
presenter.categoryState = categoryState
}
}
OOTDListViewController:
#IBAction func presentModalView(_ sender: UIBarButtonItem) {
let modalView = storyboard?.instantiateViewController(withIdentifier: "filterViewController") as! ModalViewController
let navModalView: UINavigationController = UINavigationController(rootViewController: modalView)
self.present(navModalView, animated: true, completion: nil)
}
#IBAction func printValue(_ sender: UIButton) {
print(typeState)
print(categoryState)
}
Depending on the data you want to pass, you can create a property in the presenting view controller, which you can set when dismissing the modal view controller, so you can spare yourself the delegate.
For example, you have a ContactsViewController, holding a var contacts: [Contact] = [] property. When you want to create a new contact, you present a modal view controller with the different values you need to create a new Contact object. When you are done and want to dismiss the view controller, you call the function as you did in your code, but set the property in the ContactsViewController. It will look something like this:
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
if let presenter = presentingViewController as? ContactsViewController {
presenter.contacts.append(newContact)
}
dismiss(animated: true, completion: nil)
}
If you don't want to use a delegate, this is how you go about it:
In your OOTDListViewController :
var testValue: String = ""
#IBAction func printReceivedValue(_ sender: UIButton) {
print(testValue)
}
In your modal view controller (I'll call it PresentedViewController) :
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
// if your OOTDListViewController is part of a UINavigationController stack, this check will probably fail.
// you need to put a breakpoint here and check if the presentingViewController is actually a UINavigationController.
// in that case, you will need to access the viewControllers variable and find your OOTDListViewController
if let presenter = presentingViewController as? OOTDListViewController {
presenter.testValue = "Test"
}
dismiss(animated: true, completion: nil)
}
If you want to use a delegate, this is how to do it:
In your OOTDListViewController:
protocol ModalDelegate {
func changeValue(value: String)
}
class OOTDListViewController: ModalDelegate {
var testValue: String = ""
#IBAction func presentViewController() {
// here, you either create a new instance of the ViewController by initializing it, or you instantiate it using a storyboard.
// for simplicity, I'll use the first way
// in any case, you cannot use a storyboard segue directly, bevause you need access to the reference of the presentedViewController object
let presentedVC = PresentedViewController()
presentedVC.delegate = self
present(presentedVC, animated: true, completion: nil)
}
func changeValue(value: String) {
testValue = value
print(testValue)
}
}
In your PresentedViewController:
class PresentedViewController {
var delegate: ModalDelegate?
var testValue: String = ""
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
if let delegate = self.delegate {
delegate.changeValue(testValue)
}
dismiss(animated: true, completion: nil)
}
}
If using a navigation controller you will have to first grab the UINavigation Controller and then get the correct ViewController from the Navigation Controller stack.
Here's how my code looked in that case.
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
if let navController = presentingViewController as? UINavigationController {
let presenter = navController.topViewController as! OOTDListViewController
presenter.testValue = "Test"
}
dismiss(animated: true, completion: nil)
}
I am using the a tab bar so the working code is as below:
if let tabBar = self.presentingViewController as? UITabBarController {
let homeNavigationViewController = tabBar.viewControllers![0] as? UINavigationController
let homeViewController = homeNavigationViewController?.topViewController as! HomeController
homeViewController._transferedLocationID = self.editingLocationID!
}
You need to call the delegate method in dismissViewController method
#IBAction func dismissViewController(_ sender: UIBarButtonItem) {
delegate?.sendData(typeState: "top", categoryState: "casual")
self.dismiss(animated: true) {
//
}
}
in you Modal ViewController class create delegate
weak var delegate: MyProtocol?
create a protocol with the method name sendData in MyProtocol and in your presentingViewController where you are assigning the delegate, implement the MyProtocol method
protocol MyProtocol: AnyObject {
func sendData(typeState: String, categoryState: String)
}
class ViewController: UIViewController, MyProtocol {
var typeState: String?
var categoryState: String?
override func viewDidApear() {
super.viewDidApear()
presentNewModalVC()
}
func presentNewModalVC() {
let modalVC = NewModalViewControllerToBePresented()
modalVC.delegate = self
present(modalVC, animated: true)
}
func sendData(typeState: String, categoryState: String) {
self.typeState = typeState
self.categoryState = categoryState
}
}
I'm having issues with Custom alerts and sending actions back to VC from which alert was called.
I have two classes:
Factory
ConfirmationAllert
User journey I'm trying to achieve:
The user performs actions in the Factory class after he finishes I call ConfirmationAllert using such code:
func showAlert() {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let myAlert = storyboard.instantiateViewController(withIdentifier: "ConfirmationAllert")
myAlert.modalPresentationStyle = UIModalPresentationStyle.overCurrentContext
myAlert.modalTransitionStyle = UIModalTransitionStyle.crossDissolve
(view as? UIViewController)?.present(myAlert, animated: true, completion: nil)
}
In ConfirmationAllert class I have button, which:
dismisses alert
sends action to Factory - this action is to dismiss Factory VC and go back to previous VC.
First action completes successfully, the second action not working. I'm using protocols to send the second action to Factory VC, but something is not working, and I don't know what.
Here is my code:
Factory
final class FactoryViewController: UIViewController {
let alert = ConfirmationAllert()
#IBAction func didPressSave(_ sender: UIButton) {
showAlert()
}
func goToPreviousVc() {
alert.delegate = self
print("Inside factory") -> print don't get called
// navigationController?.popViewController(animated: true) -> none of this works
// dismiss(animated: true, completion: nil) -> none of this works
}
}
extension FactoryViewController: ConfirmationAllertDelegate {
func dismissVC() {
goToPreviousVc()
print("Go to previous")
}
}
ConfirmationAllert
protocol ConfirmationAllertDelegate {
func dismissVC()
}
class ConfirmationAllert: UIViewController {
var delegate: ConfirmationAllertDelegate?
#IBAction func didPressOk(_ sender: UIButton) {
self.delegate?.dismissVC()
}
}
I didn't include viewDidLoad methods as I'm not calling anything there.
My issue is that method goToPreviousVc() doesn't perform any actions.
Thank you in advance for your help!
I guess your problem is that you setup your ConfirmationAllertDelegate at goToPreviousVc that supposed to be called using that delegate.
Instead, try to set up you delegate when you creating myAlert object
let myAlert = storyboard.instantiateViewController(withIdentifier: "ConfirmationAllert")
(myAlert as? ConfirmationAllert).delegate = self
// the rest of your code
After that, your alert will have a delegate since it was created and when you press the button, it should work as you expect.
Try to use below code
func showAlert() {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let myAlert = storyboard.instantiateViewController(withIdentifier: "ConfirmationAllert") as! ConfirmationAllert
myAlert.modalPresentationStyle = UIModalPresentationStyle.overCurrentContext
myAlert.modalTransitionStyle = UIModalTransitionStyle.crossDissolve
myAlert.delegate = self
present(myAlert, animated: true, completion: nil)
}
I have 3 view controllers.
let's name them as A, B & C.
A presents B and then C should be present from A after dismissing B.
A <=> B
A -> C
How can I achieve this?
If the question is unclear then do let me know, I would be happy to edit it.
Well, I achieved it this way.
Note: I am inside B.
let cViewController = // getting a handle of this view controller from Storyboard
let aViewController = self.navigationController?.presentingViewController
self.dismiss(animated: true) {
aViewController?.present(cViewController, animated: true)
}
You can use custom notification observer like below:
In Controller A:
override func viewDidLoad() {
super.viewDidLoad()
// Register to custom notification
NotificationCenter.default.addObserver(self, selector: #selector(presentC), name: NSNotification.Name(rawValue: "BDismissed"), object: nil)
// Rest of your code
}
func presentC {
// Controller C presentation code goes here
}
In Controller B:
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "BDismissed"), object: nil, userInfo: nil)
}
Inside B try this
self.dismiss(animated: true) {
let aVC = UIApplication.shared.keyWindow?.rootViewController as! AVC
let cVC = ///
aVC.present(cVC, animated: true, completion: nil)
}
Write a protocol in B like:
protocol VCBDelegate {
func VCBDismissed()
}
Class VCB: UIViewController {
weak var delegate: VCBDelegate?
....
}
Now where you are dismissing B, call the delegate method in completion.
func dismissB() {
self.dismiss(animated: true) {
self.delegate.VCBDismissed()
}
}
Now conform this protocol in A.
extension VCA: VCBDelegate {
func VCBDismissed() {
//Here you present C
.....
}
}
Don't forget to make the delegate self where you are presenting B.
Hope this helps, for any queries please feel free to leave a comment.
You can use closures, it's better and simple.
Your A will present B and give it a closure to call when it dismiss, this closure will present C.
Here is an example :
class ViewControllerA : UIViewController{
func showViewControllerB(){
let vc = ViewControllerB()
vc.callOnDismiss = { [weak self] in
self?.showViewControllerC()
}
self.present(vc, animated: true, completion: nil);
}
func showViewControllerC(){
let vc = ViewControllerC()
self.present(vc, animated: true, completion: nil);
}
}
class ViewControllerB : UIViewController{
var callOnDismiss : () -> () = {}
func actionOnDismiss(){
self.dismiss(animated: true, completion: nil)
self.callOnDismiss()
}
}
class ViewControllerC : UIViewController{
}