I have a main viewController and a detailsViewController. The detailsViewController has 2 buttons. Both buttons are segues back to the main controller but I want to customize the main viewController based on which segue was used. What is the best way to check which segue was used to reach a viewController so that the main viewController can be customized depending on that? - if segue1 leads to the the main viewController then I want label1 hidden. if segue2 leads to the main viewController, then I want label2 hidden.
In Main View Controller create a variable , something like
var vcOne : Bool = true
Now in DetailsViewController
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if segue.identifier == "segue_one"
{
let mainVC : MainViewController = segue.destinationViewController as! MainViewController
secondVC.vcOne = true
}
else if segue.identifier == "segue_two"
{
let mainVC : MainViewController = segue.destinationViewController as! MainViewController
secondVC.vcOne = false
}
}
Now in MainView Controller
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
//Now check here for which segue
if(vcOne)
{
// implement for button one click
}
else
{
// implement for button two click
}
}
Hope it helps you
I'd do something like to check which segue was used. You have to set an identifier to the segue in the storyboard though!
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "yourIdentifier" {
let yourVC = segue.destinationViewController as? yourViewController
//do magic with your destination
}
}
There is a option for setting Identifier for segue. This should be unique identifier. So that you can identify which segue is activated.
Ex:
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "Identifier1" {
let firstVC = segue.destinationViewController as? FirstViewController
} else if segue.identifier == "Identifier2" {
let secondVC = segue.destinationViewController as? SecondViewController
}
}
Related
I have a situation where I am presenting a child view controller "B" onto another view controller "A". View controller "B" has 5 buttons which segue(push) to a third view controller, "C". The problem is once I'm at view controller "C", I want to be able to use an unwind segue to go from C-->A without B showing up in the middle.
// view controller A class
class AViewController: UIViewController {
#IBAction func goToViewControllerB(_ sender: UIButton) {
let viewControllerB = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "viewControllerB_ID") as! BViewController
self.addChild(viewControllerB)
viewControllerB.view.frame = self.view.frame
self.view.addSubview(viewControllerB.view)
viewControllerB.didMove(toParent: self)
}
#IBAction func unwindToStart(segue: UIStoryboardSegue) {
print("back from view controller C!")
}
}
//view controller B class
class BViewController: UIViewController {
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let identifier = segue.identifier {
switch identifier {
case "segueFromBToC_1":
if let destVC = segue.destination as? CViewController {
//pass data
}
// ... cases 2-4
case "segueFromBToC_5":
if let destVC = segue.destination as? CViewController {
//pass data
}
default: break
}
}
}
}
// empty CViewController class
I know that putting the following code in my view controller B class will remove it from the parent view controller, "A", but then I can't segue from "B" to "C" anymore as "B" doesn't exist.
self.view.removeFromSuperview()
self.removeFromParent()
self.willMove(toParent: nil)
I was wondering where I should put the above code or if I should segue from a child view controller at all? I also haven't used navigation controllers as I don't know how to implement them with a child view controller. Should I have #IBAction outlets for each of the 5 buttons and put the above code in there?
UPDATE: I was able to fix it by detaching the 5 push segues from the buttons and have each of the 5 push segues go directly from view controller B to view controller C . I then had an #IBAction for each button where I had the following code in view controller B:
class BViewController: UIViewController {
#IBAction func button1ToVC3(_ sender: UIButton) {
segueAndRemoveSelf(segueName: "segueFromBToC_1")
}
#IBAction func button2ToVC3(_ sender: UIButton) {
segueAndRemoveSelf(segueName: "segueFromBToC_2")
}
#IBAction func button3ToVC3(_ sender: UIButton) {
segueAndRemoveSelf(segueName: "segueFromBToC_3")
}
#IBAction func button4ToVC3(_ sender: UIButton) {
segueAndRemoveSelf(segueName: "segueFromBToC_4")
}
#IBAction func button5ToVC3(_ sender: UIButton) {
segueAndRemoveSelf(segueName: "segueFromBToC_5")
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let identifier = segue.identifier {
switch identifier {
case "segueFromBToC_1":
if let destVC = segue.destination as? CViewController {
//pass data
}
// ... cases 2-4
case "segueFromBToC_5":
if let destVC = segue.destination as? CViewController {
//pass data
}
default: break
}
}
}
}
extension BViewController {
func segueAndRemoveSelf(segueName: String) {
self.performSegue(withIdentifier: segueName, sender: self)
self.view.removeFromSuperview()
self.removeFromParent()
self.willMove(toParent: nil)
}
}
Not sure if this is best practice though.
This is how my storyboard is linked.
This is my segue function. Segue to priceViewController works fine, but to the other view controller keeps crashing. Receiving error 'Could not cast value of type 'UINavigationController' (0x11e264a20) to 'tableViewwithSections.priceViewController'.
Any help would be appreciated.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if(segue.identifier == "toPriceView"){
let des = segue.destination as! priceViewController
des.currentCity = String(self.cityLabel.text!)
}
if(segue.identifier == "toTableView"){
let des = segue.destination as! tableViewController
des.currentCity = String(self.cityLabel.text!)
}
}
You had something like this originally and as far as I can see it should work. You need to access the tableViewController through the UINavigationController.
if(segue.identifier == "toTableView"){
let nc = segue.destination as! UINavigationController
let des = nc.topViewController! as! tableViewController
des.currentCity = String(cityLabel.text!)
}
I have an error with my segue. When I click on the information button the application crashes. In the title View I have multiple segues. The first one is for send array to the register view and the others is for opening my information Pop Up.
The message error is:
And this is the main StoryBoard:
How do I fix this?
If you have 2 segues then you need to differentiate them with the identifier
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifer == "toPopUp" {
if let yourVC = segue.destination as? YourPopController {
// set data
}
}
else {
if let yourVC = segue.destination as? RegisterViewController {
// set data
}
}
}
I'm working on a macOS project where I have a split view containing 2 other ViewControllers and I can't figure out how to access the ViewControllers from my primary window's ViewController.
this is the setup:
Basically what I'm trying to do is use the Button in my ViewController on the top-left to access the Label in my SectionController on the right, which is embedded in my split view.
Since I can't create an IBAction or IBOutlet for a control in a different ViewController, I can't figure out how to get these to be connected. My current workaround has been to have a property on my AppDelegate and then access the main shared application delegate, but that feels hacky and won't scale. I'm completely lost as to how to proceed. I'm ok with using a function to pass data or whatever to the other ViewController(s).
I'm using Swift 4 with Xcode 9 (beta).
Any ideas?
Of course you can't create IBAction or IBOutlet for a control in a different ViewController!!
But simply each view controller in the hierarchy has a reference for its child view controllers.
Method 1:
#IBAction func buttonTapped(_ sender: Any) {
let splitViewController = self.childViewControllers[0] as! YourSplitViewController
let targetViewController = splitViewController.childViewControllers[0] as! YourTargetViewController
targetViewController.label.text = "Whatever!"
}
Method 2:
It may be better if you took a reference for each child controller in your "prepare for segue" method
ContainerViewController:
var mySplitViewController: YourSplitViewController?
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "splitViewSegue" {
self.mySplitViewController = segue.destination as! YourSplitViewController
}
}
YourSplitViewController:
var aViewController: YourFirstViewController?
var bViewController: YourSecondViewController?
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "aViewSegue" {
self.aViewController = segue.destination as! YourFirstViewController
} else if segue.identifier == "bViewSegue" {
self.bViewController = segue.destination as! YourSecondViewController
}
}
So you can access it like that in your container view controller:
#IBAction func buttonTapped(_ sender: Any) {
self.mySplitViewController.firstViewController.label.text = "Whatever!"
}
I have two subview in my TabBarcontroller and one of this, is connected with a one ViewController
I would bring the Label.text from Viewcontroller to the first subview of my TabBar and I tryed with
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "returnView"{
var destVC = segue.destinationViewController as ViewController
destVC.str = "\(helloLabel.text)"
}
}
But don't go , how can I do ?