I have a tab bar controller with 2 views attached, each embed in navigation controller. I've made a segue kind show from tab bar controller to another view controller with identifier "toNew". In one of the tab bar views I have a button which should trigger this segue with identifier "toNew".
I tried DataDelegate but it doesn't work here.
It's this part of storyboard
This is view controller file for view controller attached in tab bar
import UIKit
protocol DataDelegate {
func sendData(data : String)
}
class NavContToNew: UIViewController , UITabBarDelegate {
var delegate : DataDelegate?
var data : String = "ToNew"
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func dismiss(_ sender: Any) {
//self.dismiss(animated: true, completion: nil)
self.delegate?.sendData(data:self.data)
print("Perform segue delegate")
}
}
And this is tab bar controller.swift file
import UIKit
class TabBarCont: UITabBarController , DataDelegate {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func sendData(data: String) {
if data == "ToNew" {
print("Segue perform")
self.performSegue(withIdentifier: "toNew", sender: self)
}
}
}
In you NavContToNew , you haven't assigned a delegate.
#IBAction func dismiss(_ sender: Any) {
self.delegate = self.tabBarController as! TabBarCont
//self.dismiss(animated: true, completion: nil)
self.delegate?.sendData(data:self.data)
print("Perform segue delegate")
}
By the way , you don't need to use delegate. You can call your taBarController anywhere in its viewControllers. Here, you can call it in
NavContToNew without using delegate.
self.tabBarController?.performSegue(withIdentifier: "toNew", sender: self.tabBarController)
Related
I have a Nav View which when it pops out by tapping the burger menu then opens to half the page. It still has the other views (the root view controller and its children) in the background.
When a user taps the greyed out background area where the other views are they can interact with those views and the page navigates leaving the nav view over the top.
The Nav View is used in multiple places so I need the code for disabling interactions with other views to be in the Nav View Controller. Code below.
import UIKit
class MenuNavViewController: ENSideMenuNavigationController, ENSideMenuDelegate {
var tabBar: ManagerTabViewController!
override func viewDidLoad() {
super.viewDidLoad()
let sb = UIStoryboard(name: "iPhoneStoryboard", bundle: nil)
let menu = sb.instantiateViewController(withIdentifier: "MenuTableViewController") as! MenuTableViewController
menu.tabBar = self.tabBar
sideMenu = ENSideMenu(sourceView: self.view, menuViewController: menu, menuPosition: .left)
sideMenu?.bouncingEnabled = false
view.bringSubview(toFront: navigationBar)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - ENSideMenu Delegate
func sideMenuWillOpen() {
}
func sideMenuWillClose() {
}
func sideMenuDidClose() {
}
func sideMenuDidOpen() {
}
}
How can I disable/enable interaction with other views (or at least the view it's launched from) in the NavViewController above?
I found the answer shown in the code below.
Looking further into the ENSideMenuNavigationController class I found that the "init" method sets the relevant view controllers on "viewControllers" and implemented the code below which gave the desired effect.
import UIKit
class MenuNavViewController: ENSideMenuNavigationController, ENSideMenuDelegate {
var tabBar: ManagerTabViewController!
override func viewDidLoad() {
super.viewDidLoad()
let sb = UIStoryboard(name: "iPhoneStoryboard", bundle: nil)
let menu = sb.instantiateViewController(withIdentifier: "MenuTableViewController") as! MenuTableViewController
menu.tabBar = self.tabBar
sideMenu = ENSideMenu(sourceView: self.view, menuViewController: menu, menuPosition: .left)
sideMenu?.bouncingEnabled = false
sideMenu?.delegate = self
view.bringSubview(toFront: navigationBar)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - ENSideMenu Delegate
func sideMenuWillOpen() {
}
func sideMenuWillClose() {
}
func sideMenuDidClose() {
// Enable interaction with other views again
for viewController in self.viewControllers {
viewController.view.isUserInteractionEnabled = true
}
}
func sideMenuDidOpen() {
// Disable interaction with other views
for viewController in self.viewControllers {
viewController.view.isUserInteractionEnabled = false
}
}
}
Any other suggestions for better practice/code would still be appreciated.
I cannot get my delegate protocol to work. I used this stack overflow questions as a guide dispatch event to parent ViewController in swift . I don't know if things have changed in Swift 3 since this post, but my function in my parentViewController is never getting called. Here is my setup.
//PROTOCOL
protocol PDPPropDetailsDelegate {
func buttonPressed(PropDetailsVC: propertyDetailsVC)
}
// CHILD VIEW CONTROLLER
class propertyDetailsVC: UIViewController {
var delegate: PDPPropDetailsDelegate?
#IBAction func emailButton(_ sender: AnyObject) {
self.delegate?.buttonPressed(PropDetailsVC: self)
}
}
The Button is getting called in Child View Controller.
// PARENT VIEW CONTROLLER
class ImageDetailsVC: UIViewController, PDPPropDetailsDelegate {
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "container"{
container = segue.destination as! ContainerViewController
}
}
#IBAction func segmentControlAct(_ sender: Any) {
switch segmentControllerView.selectedIndex {
case 0: print("case 1")
container!.segueIdentifierReceivedFromParent("first")
case 1: print("case 2")
container!.segueIdentifierReceivedFromParent("second")
PropertyDetailsVC.delegate = self // **WHERE I SET DELEGATE**
setUpPropertyDetailsUI(property: filterImages)
default: print("default")
}
}
func buttonPressed(PropDetailsVC: propertyDetailsVC) {
print("BUTTON PRESSED")
}
}
Button Pressed is never called. I assume it has to do with the delegate not getting set properly. Not exactly sure why that would be the case though. My setUpPropertyDetailsUI(property: filterImages) takes the Outlets from that VC and sets that works just fine. I did a breakpoint and it is called when I segment over to the PropertyDetailsVC. Any advice or suggestions?
import UIKit
open class ContainerViewController: UIViewController {
//Manipulating container views
fileprivate weak var viewController : UIViewController!
//Keeping track of containerViews
fileprivate var containerViewObjects = Dictionary<String,UIViewController>()
/** Specifies which ever container view is on the front */
open var currentViewController : UIViewController{
get {
return self.viewController
}
}
fileprivate var segueIdentifier : String!
/*Identifier For First Container SubView*/
#IBInspectable internal var firstLinkedSubView : String!
override open func viewDidLoad() {
super.viewDidLoad()
}
open override func viewDidAppear(_ animated: Bool) {
if let identifier = firstLinkedSubView{
segueIdentifierReceivedFromParent(identifier)
}
}
override open func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func segueIdentifierReceivedFromParent(_ identifier: String){
self.segueIdentifier = identifier
self.performSegue(withIdentifier: self.segueIdentifier, sender: nil)
}
override open func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == segueIdentifier{
//Remove Container View
if viewController != nil{
viewController.view.removeFromSuperview()
viewController = nil
}
//Add to dictionary if isn't already there
if ((self.containerViewObjects[self.segueIdentifier] == nil)){
viewController = segue.destination
self.containerViewObjects[self.segueIdentifier] = viewController
}else{
for (key, value) in self.containerViewObjects{
if key == self.segueIdentifier{
viewController = value
}
}
}
self.addChildViewController(viewController)
viewController.view.frame = CGRect(x: 0,y: 0, width: self.view.frame.width,height: self.view.frame.height)
self.view.addSubview(viewController.view)
viewController.didMove(toParentViewController: self)
}
}
}
import UIKit
class EmptySegue: UIStoryboardSegue{
override func perform() {
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
You seem to be a little confused at the flow of the app. Here's an answer I wrote for someone else's question about this same topic:
https://stackoverflow.com/a/45312362/3832646
Your protocol and Child view controller look great, but there are quite a few things amiss with the rest of your code here:
your prepare(for segue:_, sender:_) is typically where you would set the delegate for the destination (child) view controller.
PropertyDetailsVC.delegate = self won't do anything - you need an instance of the view controller to set its delegate.
It looks like you're using some sort of container global variable that I'm not sure what it would be for.
Take a look at the answer I posted and have another go. It's in Swift 3.
I am trying to pass data back from the second viewController.
I can do that without NavigationController. But now I need to use NavigationController. Then my code does work as before. The data wont pass.
Here is the simple code:
In first viewController
class ViewController: UIViewController, backfromSecond {
#IBOutlet weak var text: UILabel!
var string : String?
override func viewDidLoad() {
super.viewDidLoad()
self.string = "Start here"
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(true)
self.text.text = self.string
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let destinationViewController = segue.destination as? secondViewController{
destinationViewController.delegate = self
}
}
func back(text: String) {
self.string = text
print(text)
}
}
And Second viewController:
protocol backfromSecond {
func back(text: String)
}
class secondViewController: UIViewController {
var string : String = "nothing here"
var delegate : backfromSecond?
override func viewDidLoad() {
super.viewDidLoad()
delegate?.back(text: string)
// Do any additional setup after loading the view.
}
}
What is wrong here?
Suppose A & B are two controllers and you first navigated from A to B with some data. And now you want to POP from B to A with some data.
Unwind Segues is the best and recommended way to do this.
Here are the steps.
Open A.m
define following method
#IBAction func unwindSegueFromBtoA(segue: UIStoryNoardSegue) {
}
open storyboard
Select B ViewController and click on ViewController outlet. press control key and drag to 'Exit' outlet and leave mouse here. In below image, selected icon is ViewController outlet and the last one with Exit sign is Exit Outlet.
You will see 'unwindSegueFromBtoA' method in a popup . Select this method .
Now you will see a segue in your view controler hierarchy in left side. You will see your created segue near StoryBoard Entry Piont in following Image.
Select this and set an identifier to it. (suggest to set the same name as method - unwindSegueFromBtoA)
Open B.m . Now, wherever you want to pop to A. use
self.performSegueWithIdentifier("unwindSegueFromBtoA", sender: dataToSend)
Now when you will pop to 'A', 'unwindSegueFromBtoA' method will be called. In unwindSegueFromBtoA of 'A' you can access any object of 'B'.
That's it..!
I think your problem is in the prepare for segue method. If the view controller is on a navigation stack i think your code should be something like
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let destinationViewController = segue.destination as? UINavigationController).topViewController as! secondViewController{
destinationViewController.delegate = self
}
}
You can use unwind segues to pass data back.
Here's a tutorial
https://spin.atomicobject.com/2014/10/25/ios-unwind-segues/
This works me well.
1st VC
class ViewController: UIViewController, backfromSecond {
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func Passingfrom1stVCTo2ndVC(_ sender: AnyObject) {
if let vc = self.storyboard?.instantiateViewController(withIdentifier: "ViewController3") as? ViewController3{
vc.dataFrom1StVC = "message send from 1st VC"
vc.delegate = self
self.navigationController?.pushViewController(vc, animated: true)
}
}
func back(text: String) {
print("data\(text)")
}
}
2nd VC.
protocol backfromSecond: class {
func back(text: String)
}
class ViewController3: UIViewController {
var dataFrom1StVC : String? = nil
week var delegate : backfromSecond?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func DataSendFrom2ndVCTo1stVC(_ sender: AnyObject) {
self.delegate?.back(text: "Message Send From 2nd vc to 1st VC")
self.navigationController?.popViewController(animated: true)
}
}
I hope it will work you. If any problem then ask me i will help you.
I got a TabBarController with two Views in my project. Now I want to set a FirstViewController with two buttons as Initial View Controller when the app launches. The first button should show the FirstView in the TabBarController and the second button the second one. When one of the two buttons is pressed the FirstViewController should disappear and it should only be possible to navigate between the two Views with the Tabs in TabBarViewController.
I did some minor edit, and tested the code I wrote and it works. Control drag from firstButton over to the TabBarController and select Kind as "Show". Then do the same with secondButton.
In your view with the two buttons, I call it First:
import Foundation
import UIKit
class First: UIViewController {
var firstWasClicked = false
#IBAction func firstButtonAction(sender: UIButton) {
firstWasClicked = true
}
#IBAction func secondButtonAction(sender: UIButton) {
firstWasClicked = false
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let controller = segue.destinationViewController as! TabBarController
controller.firstSelected = firstWasClicked
}
}
then in your TabBarController:
import Foundation
import UIKit
class TabBarController: UITabBarController {
var firstSelected = true
override func viewDidLoad() {
if(firstSelected) {
self.selectedIndex = 0
}
else {
self.selectedIndex = 1
}
}
}
This is probably what you want.
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func didTapFirst(button: UIButton) {
showViewControllerAt(index: 0)
}
#IBAction func didTapSecond(button: UIButton) {
showViewControllerAt(index: 1)
}
func showViewControllerAt(index: NSInteger) {
let tabBarController = self.storyboard?.instantiateViewController(withIdentifier: "TabBarController") as! UITabBarController
tabBarController.selectedIndex = index
UIApplication.shared.keyWindow?.rootViewController = tabBarController
}
}
Don't forget to set the Storyboard ID of your UITabBarController.
I'm presenting a tutorial of 4 UIViewController when my app starts the first time.
Every UIViewController has a Button with a segue presenting the next ViewController.
The last ViewController has a button "Let's start" which should dismiss the tutorial completely.
Problem:
It this dismiss all ViewControllers except the first. I don't understand why?!
What I expect:
On the last ViewController4 I'm calling the dismissIntroduction() function of the first ViewController, so I except ALL ViewControllers (ViewController1 included) should disappear.
When I put a button on the first ViewController and call the function "dismissIntroduction()" it disappears.
ViewController 1 (WelcomeViewController):
protocol WelcomeViewDelegate {
func dismissIntroduction()
}
class WelcomeViewController: UIViewController, WelcomeViewDelegate {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
func dismissIntroduction() {
self.dismissViewControllerAnimated(true, completion: nil)
}
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let destination = segue.destinationViewController as! ViewController2
destination.delegate = self
}
}
ViewController 2:
class ViewController2: UIViewController {
var delegate:WelcomeViewDelegate?
override func viewDidLoad() {
super.viewDidLoad()
}
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let destination = segue.destinationViewController as! ViewController3
destination.delegate = self.delegate
}
}
ViewController 3:
class ViewController3: UIViewController {
var delegate:WelcomeViewDelegate?
override func viewDidLoad() {
super.viewDidLoad()
}
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let destination = segue.destinationViewController as! ViewController4
destination.delegate = self.delegate
}
}
ViewController4 (the last one):
class ViewController4: UIViewController {
var delegate:WelcomeViewDelegate?
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func pressLetsStart(sender: AnyObject) {
self.delegate!.dismissIntroduction()
}
}
EDIT:
I got it working, when I put the dismissViewControllerAnimated function TWO times!?
func dismissIntroduction() {
self.dismissViewControllerAnimated(true, completion: nil)
self.dismissViewControllerAnimated(true, completion: nil)
}
But why? I don't understand the logic behind...
You are looking at the wrong solution to your problem, what you need to do is look for Unwind Segues. Go through this tutorial: https://spin.atomicobject.com/2014/10/25/ios-unwind-segues/
I solved the problem now with following function in last ViewController:
#IBAction func pressLetsStart(sender: AnyObject) {
self.dismissModalStack()
}
private func dismissModalStack() {
var vc = self.presentingViewController! as UIViewController
while (vc.presentingViewController != nil) {
vc = vc.presentingViewController!;
}
vc.dismissViewControllerAnimated(true, completion: nil)
}