I have a view controller which has two buttons and an embedded TabBarController.
I want to use the two button instead of the tab bar item. And for some reason cannot make it work.
MainView
import UIKit
class ViewController: UIViewController {
var currentTab = 0
#IBOutlet weak var container: UIView!
#IBAction func item1Button(_ sender: UIButton) {
currentTab = 0
}
#IBAction func item2Button(_ sender: UIButton) {
currentTab = 1
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "toControllers"{
if let vc = segue.destination as? TabsViewController {
vc.selectedIndex = currentTab
}
}
}
}
TabBarController
import UIKit
class TabsViewController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
}
}
I have two items in the storyboard, so item 0 and 1 should be ok.
Maybe it is very simple, cannot figure it out myself.
Thank you!
I figure it out, here is the solution:
Changed the main controller to:
class ViewController: UIViewController {
var currentTab = 1
private var tabViewController: UITabBarController?
#IBOutlet weak var container: UIView!
#IBAction func item1Button(_ sender: UIButton) {
print("click item1")
tabViewController?.selectedIndex = 0
}
#IBAction func item2Button(_ sender: UIButton) {
print("click item2")
tabViewController?.selectedIndex = 1
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "toControllers"{
if let vc = segue.destination as? TabsViewController {
tabViewController = vc
}
}
}
Related
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)
}
}
I have been working on an app that allows multiple text fields from the first view controller pass over to the second view controller upon pressing a button. However, the text fields are permanently in the second view controller when I only want them to be if the button is pressed. Here is the code for the first view controller! Any help is greatly appreciated.
class ViewController: UIViewController {
#IBOutlet weak var textField: UITextField!
#IBOutlet weak var textField1: UITextField!
#IBAction func buttonTwo(_ sender: Any) {
if textField1.text != "" {
performSegue(withIdentifier: "segue", sender: self)
}
}
#IBAction func buttonOne(_ sender: Any) {
if textField.text != "" {
performSegue(withIdentifier: "segue", sender: self)
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
var secondController = segue.destination as! SecondViewController
secondController.myString1 = textField1.text!
secondController.myString = textField.text!
}
}
Here is the code in the second view controller:
class SecondViewController: UIViewController {
#IBOutlet weak var label: UILabel!
#IBOutlet weak var label1: UILabel!
var myString = String()
var myString1 = String()
override func viewDidLoad() {
super.viewDidLoad()
label.text = myString
label1.text = myString1
// Do any additional setup after loading the view.
}
}
Image of storyboard
This happens because, prepare for segue will be called every time you perform some segue action.
You should manage to have a bool variable that helps you track, if any button is clicked or not, if the segue is performed from the click of the button, then only you will have to set the text while preparing for segue.
here is your updated viewController
class ViewController: UIViewController {
#IBOutlet weak var textField: UITextField!
#IBOutlet weak var textField1: UITextField!
var isButtonClicked: Bool = false
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
/*reset isButtonClicked to false, when you back from second viewController */
isButtonClicked = false
}
#IBAction func buttonTwo(_ sender: Any) {
if textField1.text != "" {
isButtonClicked = true
performSegue(withIdentifier: "segue", sender: self)
}
}
#IBAction func buttonOne(_ sender: Any) {
if textField.text != "" {
isButtonClicked = true
performSegue(withIdentifier: "segue", sender: self)
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if isButtonClicked {
var secondController = segue.destination as! SecondViewController
secondController.myString1 = textField1.text!
secondController.myString = textField.text!
}
}
}
Try and share your results.
I have two View Controllers. In the first one, let's call it ViewControllerA, I have a Button. In the second view controller, let's call it ViewControllerB, I have a View. The Button in ViewControllerA performs a segue to ViewControllerB. Normally, the View in ViewControllerB has its isHidden property set to true.
How do I make it so when I click the Button in ViewControllerA, the View in ViewControllerB has its isHidden property changed to false?
This is what I have for ViewControllerA
class ViewControllerA: UIViewController {
var buttonPressed : Bool = false
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
#IBAction func theButton(_ sender: Any) {
buttonPressed = true
performSegue(withIdentifier: "goToControllerB", sender: self)
}
}
And this is what I have for ViewControllerB:
class ViewControllerB: UIViewController {
#IBOutlet weak var myView: UIView!
var isButtonPressed : Bool = ViewControllerA().buttonPressed
override func viewDidLoad() {
super.viewDidLoad()
if isButtonPressed == true {
myView.isHidden = false
}
else {
myView.isHidden = true
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
Implement the prepareForSegue method in ViewControllerA like so:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "goToControllerB" {
if let destinationVC = segue.destination as? ViewControllerB {
destinationVC.isButtonPressed = false
}
}
}
And in ViewControllerB, change the variable:
var isButtonPressed: Bool?
Just override prepare(for:sender:) in your ViewControllerA like this:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
guard segue.identifier == "goToControllerB", let destination = segue.destination as? ViewControllerB else { return }
destination.isButtonPressed = true
}
Then, inside viewDidLoad() function in your ViewControllerB, set visibility of the view:
myView.isHidden = !isButtonPressed
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.
I want to take a variable nomeLabel in the func goToSecondView and display it on a SecondView
class ViewController: UIViewController {
var nomeLabel:String!
#IBAction func goToSecondView(sender: AnyObject) {
self.performSegueWithIdentifier("goToSecondView", sender: self)
let newButton = sender as UIButton
nomeLabel = newButton.titleLabel!.text
println("nomeLabel \(nomeLabel)")
}
}
how can I do ?
You need to implement prepareForSegue where you have access to the destination view controller. Here is an example on how to do that:
class ViewController: UIViewController {
#IBOutlet var newButton: UIButton!
#IBAction func goToSecondView(sender: AnyObject) {
self.performSegueWithIdentifier("goToSecondView", sender: self)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "goToSecondView" {
let secondViewController = segue.destinationViewController as SecondViewController
secondViewController.nomeLabel = self.newButton.titleLabel.text
}
}