I have navigation controller with one rootViewController called "LoginController". When I try to add rightBarButtonItem from init of LoginController so it works, but directly in navigation controller same operation does not works.
This works:
class LoginController: UIViewController {
init(){
super.init(nibName: nil, bundle: nil)
let button = UIBarButtonItem()
button.title = "Test2"
navigationItem.rightBarButtonItem = button
}
......
}
This doesn't work:
class MainNavigationController : UINavigationController{
private var _distributionProvider : DistributionProvider!
init(rootViewController: UIViewController, distributionProvider : DistributionProvider) {
_distributionProvider = distributionProvider
super.init(rootViewController: rootViewController)
navigationBar.barTintColor = UIColor(red: 90/255, green: 177/255, blue: 225/255, alpha: 1)
let button = UIBarButtonItem()
button.title = "Test"
navigationItem.rightBarButtonItem = button
}
....
}
Where is problem? Thanks
You've to do this:
class MainNavigationController: UITabBarController, UITabBarControllerDelegate{
override func viewDidLoad() {
super.viewDidLoad()
delegate = self
}
override func viewWillAppear(animated: Bool) {
let item1 = Item1ViewController()
let icon1 = UITabBarItem(title: "Title", image: UIImage(named: "someImage.png"), selectedImage: UIImage(named: "otherImage.png"))
item1.tabBarItem = icon1
let controllers = [item1] //array of the root view controllers displayed by the tab bar interface
self.viewControllers = controllers
}
//Delegate methods
func tabBarController(tabBarController: UITabBarController, shouldSelectViewController viewController: UIViewController) -> Bool {
print("Should select viewController: \(viewController.title) ?")
return true;
}
}
Related
I want to navigate from one View Controller to another.
let vc = SecondViewController()
I have tried until now :
vc.modalPresentationController = .fullScreen
self.present(vc, animated: true) //self refers to the main view controller
Im trying to open a new ViewController when the users manages to register or to log in.I am new to software developing, and I want to ask, is this the best method to navigate from one ViewController to another, im asking because as I can see the mainViewController is not deinit(). I have found other similar questions and tried the answers, the problem is with the:
self.navigationController?.pushViewController
it doesn't work because I don't have any storyboard.
The question is it is right to navigate as explained above?
Thanks,
Typically when you are doing login you would use neither push or present. There are multiple ways of handling this, but the easiest is to embed in some parent (root) VC. Here is an example:
class ViewController: UIViewController {
private var embeddedViewController: UIViewController! {
didSet {
// https://developer.apple.com/documentation/uikit/view_controllers/creating_a_custom_container_view_controller
// Add the view controller to the container.
addChild(embeddedViewController)
view.addSubview(embeddedViewController.view)
// Create and activate the constraints for the child’s view.
embeddedViewController.view.translatesAutoresizingMaskIntoConstraints = false
embeddedViewController.view.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
embeddedViewController.view.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
embeddedViewController.view.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
embeddedViewController.view.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
// Notify the child view controller that the move is complete.
embeddedViewController.didMove(toParent: self)
}
}
override func viewDidLoad() {
super.viewDidLoad()
let loginVC = LoginViewController()
loginVC.delegate = self
embeddedViewController = loginVC
}
}
extension ViewController: LoginDelegate {
func didLogin() {
embeddedViewController = MainViewController()
}
}
protocol LoginDelegate: AnyObject {
func didLogin()
}
class LoginViewController: UIViewController {
private lazy var loginButton: UIButton = {
let button = UIButton()
button.setTitle("Login", for: .normal)
button.addTarget(self, action: #selector(didTapLoginButton), for: .touchUpInside)
return button
}()
weak var delegate: LoginDelegate?
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(loginButton)
view.backgroundColor = .red
loginButton.translatesAutoresizingMaskIntoConstraints = false
loginButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
loginButton.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
}
#objc private func didTapLoginButton() {
delegate?.didLogin()
}
}
class MainViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .blue
}
}
I have a simple push segue from one view controller to another. I want both segues (original and unwind to be unanimated).
In the attached playground, specifying false for the segue does, indeed remove the PUSH animation, but not the UNWIND animation.
Is there a way to remove the implicit animation in the UNWIND segue?
import UIKit
import PlaygroundSupport
class SourceViewController : UIViewController {
#objc func goDestination(_: Any) {
navigationController?.pushViewController(DestinationViewController(), animated: false)
}
override func loadView() {
view = UIView()
navigationItem.title = "SOURCE"
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .action, target: self, action: #selector(goDestination(_:)))
}
}
class DestinationViewController : UIViewController {
override func loadView() {
view = UIView()
view.backgroundColor = .yellow
navigationItem.title = "DESTINATION"
}
}
PlaygroundPage.current.liveView = UINavigationController(rootViewController: SourceViewController())
Those animations are fully customizable from the UINavigationControllerDelegate, check out the first "Supporting Custom Transition Animations" method
https://developer.apple.com/documentation/uikit/uinavigationcontrollerdelegate
Some details here https://www.youtube.com/watch?v=jWckfDNUJVY
at 23 minutes.
I'm greenchecking #glotcha's answer. It led me to this Medium post, which led me to this solution (I really wanted a fade transition):
import UIKit
import PlaygroundSupport
class TransitioningAnimatorInOut: NSObject, UIViewControllerAnimatedTransitioning {
var presenting: Bool = false
func transitionDuration(using: UIViewControllerContextTransitioning?) -> TimeInterval { 0.75 }
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
guard let fromView = transitionContext.view(forKey: .from),
let toView = transitionContext.view(forKey: .to) else { return }
let container = transitionContext.containerView
if presenting {
container.addSubview(toView)
toView.alpha = 0.0
} else {
container.insertSubview(toView, belowSubview: fromView)
}
UIView.animate(withDuration: transitionDuration(using: transitionContext), animations: {
if self.presenting {
toView.alpha = 1.0
} else {
fromView.alpha = 0.0
}
}) { _ in
let success = !transitionContext.transitionWasCancelled
if !success {
toView.removeFromSuperview()
}
transitionContext.completeTransition(success)
}
}
init(presenting inPresenting: Bool) { presenting = inPresenting }
}
extension UINavigationController: UINavigationControllerDelegate {
public func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationController.Operation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
if operation == .push {
return TransitioningAnimatorInOut(presenting: true)
} else {
return TransitioningAnimatorInOut(presenting: false)
}
}
}
class SourceViewController : UIViewController {
#objc func goDestination(_: Any) {
navigationController?.pushViewController(DestinationViewController(), animated: true)
}
override func loadView() {
view = UIView()
view?.backgroundColor = .yellow
navigationItem.title = "SOURCE"
navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .action, target: self, action: #selector(goDestination(_:)))
}
}
class DestinationViewController : UIViewController {
override func loadView() {
view = UIView()
view?.backgroundColor = .red
navigationItem.title = "DESTINATION"
}
}
PlaygroundPage.current.liveView = UINavigationController(rootViewController: SourceViewController())
I am trying to create a rightBarButtonItem that appears throughout my app. When this barItem is clicked I want to show a modal popup using UIPopoverPresentationController. I have been able to get the button to show up on the barItem on all the views. However when i click on the button the xib takes over the entire view (including nav bar, see image below). Please see the class below:
class MyAppsNavigationController: UINavigationController, UINavigationControllerDelegate, UIPopoverPresentationControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
self.delegate = self
self.navigationBar.barTintColor = Colors.Red01.color()
self.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName : UIColor.white]
}
func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {
viewController.navigationItem.rightBarButtonItem = UIBarButtonItem(image: #imageLiteral(resourceName: "Ellipsis"), style: .plain, target: self, action: #selector(displayMenu(sender:)))
}
func displayMenu(sender: UIBarButtonItem)
{
let filterVC = DropdownMenuController(nibName: "DropdownMenuController", bundle: nil)
let nav = UINavigationController(rootViewController: filterVC)
nav.modalPresentationStyle = UIModalPresentationStyle.popover
//nav.isNavigationBarHidden = true
nav.preferredContentSize = CGSize(width: 200, height: 300)
let popover = nav.popoverPresentationController! as UIPopoverPresentationController
popover.permittedArrowDirections = .up
popover.delegate = self
popover.barButtonItem = self.navigationItem.rightBarButtonItem
popover.sourceView = self.view;
var frame:CGRect = (sender.value(forKey: "view")! as AnyObject).frame
frame.origin.y = frame.origin.y+20
popover.sourceRect = frame
popover.delegate = self
self.present(nav, animated: true, completion: nil)
}
func adaptivePresentationStyleForPresentationController(controller: UIPresentationController) -> UIModalPresentationStyle {
return .none
}
}
Result when clicked on the button:
When clicked the popup takes over entire view:
Any chance you're not using the right delegate method? I think this looks better:
func adaptivePresentationStyle(for controller: UIPresentationController) -> UIModalPresentationStyle {
return .none
}
Also, in this case sourceView and sourceRect is not needed: specifying a barButtonItem for the popover presentation controller is sufficient.
https://developer.apple.com/documentation/uikit/uipopoverpresentationcontroller/1622314-barbuttonitem
I have been struggling with an issue for loading child ViewControllers. The first time I log in it shows the containerView but without the childViewControllers loaded. When I close the app and re-open the app with the logged in state saved the childViews in the containerView are displayed. I know it has something to do with my window hierarchy and rootviewController. I have researched this a bunch but still am having issues solving. Thanks in advance!
// app delegate
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
window = UIWindow(frame: UIScreen.main.bounds)
window?.makeKeyAndVisible()
window?.rootViewController = MainNavigationController()
return true
}
// mainNavigationController - RootViewController
class MainNavigationController: UINavigationController {
override func viewDidLoad() {
super.viewDidLoad()
let vc1 = TravelersFeedVC()
let vc2 = ProfileVC()
if isLoggedIn() {
// assume user is logged in
let homeController = HomeController()
homeController.firstViewController = vc1
homeController.secondViewController = vc2
viewControllers = [homeController]
} else {
perform(#selector(showLoginController), with: nil, afterDelay: 0.01)
}
}
fileprivate func isLoggedIn() -> Bool {
return UserDefaults.standard.isLoggedIn()
}
func showLoginController() {
let loginController = LoginController()
present(loginController, animated: true, completion: {
// perhaps do something here later
})
}
}
// log in function
func finishLoggingIn() {
let rootViewController = UIApplication.shared.keyWindow?.rootViewController
guard let mainNavigationController = rootViewController as? MainNavigationController else { return }
mainNavigationController.viewControllers = [HomeController()]
let vc1 = TravelersFeedVC()
let vc2 = ProfileVC()
let homeController = HomeController()
homeController.firstViewController = vc1
homeController.secondViewController = vc2
UserDefaults.standard.setIsLoggedIn(value: true)
dismiss(animated: true, completion: nil)
}
// HomeController
class HomeController: UIViewController, FBSDKLoginButtonDelegate {
// child view controllers to put inside content view
var firstViewController: TravelersFeedVC?
var secondViewController: ProfileVC?
private var activeViewController: UIViewController? {
didSet {
removeInactiveViewController(inactiveViewController: oldValue)
updateActiveViewController()
}
}
private func removeInactiveViewController(inactiveViewController: UIViewController?) {
if let inActiveVC = inactiveViewController {
// call before removing child view controller's view from hierarchy
inActiveVC.willMove(toParentViewController: nil)
inActiveVC.view.removeFromSuperview()
// call after removing child view controller's view from hierarchy
inActiveVC.removeFromParentViewController()
}
}
private func updateActiveViewController() {
if let activeVC = activeViewController {
// call before adding child view controller's view as subview
addChildViewController(activeVC)
activeVC.view.frame = contentView.bounds
contentView.addSubview(activeVC.view)
// call before adding child view controller's view as subview
activeVC.didMove(toParentViewController: self)
}
}
// UI elements
lazy var contentView: UIView = {
let tv = UIView()
tv.backgroundColor = UIColor.blue
tv.translatesAutoresizingMaskIntoConstraints = false
tv.layer.masksToBounds = true
return tv
}()
var segmentedController: UISegmentedControl!
override func viewDidLoad() {
super.viewDidLoad()
activeViewController = firstViewController
checkIfUserIsLoggedIn()
view.addSubview(contentView)
setupProfileScreen()
let items = ["Travelers", "Me"]
segmentedController = UISegmentedControl(items: items)
navigationItem.titleView = segmentedController
segmentedController.tintColor = UIColor.black
segmentedController.selectedSegmentIndex = 0
// Add function to handle Value Changed events
segmentedController.addTarget(self, action: #selector(HomeController.segmentedValueChanged(_:)), for: .valueChanged)
navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Sign Out", style: .plain, target: self, action: #selector(handleSignOut))
navigationItem.leftBarButtonItem?.tintColor = UIColor.black
}
// reference to collectionViewController
var travelersFeedVC: TravelersFeedVC!
func segmentedValueChanged(_ sender:UISegmentedControl!)
{
switch segmentedController.selectedSegmentIndex {
case 0:
activeViewController = firstViewController
case 1:
activeViewController = secondViewController
default: // Do nothing
break
}
}
In your finishLoggingIn() it looks like you are using 2 separate HomeController instances.
Something like this should fix it.
func finishLoggingIn() {
let rootViewController = UIApplication.shared.keyWindow?.rootViewController
guard let mainNavigationController = rootViewController as? MainNavigationController else { return }
// create it
let homeController = HomeController()
// use it
mainNavigationController.viewControllers = [homeController]
let vc1 = TravelersFeedVC()
let vc2 = ProfileVC()
// use it again
homeController.firstViewController = vc1
homeController.secondViewController = vc2
UserDefaults.standard.setIsLoggedIn(value: true)
dismiss(animated: true, completion: nil)
}
How to create programmatically tabs from any class extended by UIViewController:
class DashboardTabBarController: UITabBarController {
override func viewDidLoad() {
//here
}
...
}
UPDATE SWIFT 5
One example of how to create an UITabBarController programmatically could be like this:
First we create the UIViewControllers that will be the content for each tab of the tab bar interface. For this example we only create one very simple.
class Item1ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.green
self.title = "item1"
print("item 1 loaded")
}
}
Now, the UITabBarController:
We create the new instances of the UIViewControllers that we want to display in the tab bar. Then we create an icon for each instance we have created and then we create an array that contains all UIViewControllers that specify the content for each tab of the tab bar interface. The order of the view controllers in the array corresponds to the display order in the tab bar.
class DashboardTabBarController: UITabBarController, UITabBarControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
delegate = self
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
let item1 = Item1ViewController()
let icon1 = UITabBarItem(title: "Title", image: UIImage(named: "someImage.png"), selectedImage: UIImage(named: "otherImage.png"))
item1.tabBarItem = icon1
let controllers = [item1] //array of the root view controllers displayed by the tab bar interface
self.viewControllers = controllers
}
//Delegate methods
func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
print("Should select viewController: \(viewController.title ?? "") ?")
return true;
}
}
If you are using storyboard for the viewcontrollers then you have to write like this in your tabbarcontroller class.
class CustomTabbarController : UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let firstViewController = FirstViewController()
let navigationController = UINavigationController(rootViewController: firstViewController)
navigationController.title = "First"
navigationController.tabBarItem.image = UIImage.init(named: "map-icon-1")
viewControllers = [navigationController]
if let secondViewController = storyboard.instantiateViewController(withIdentifier: "SecondViewController") as? SecondViewController {
let navgitaionController1 = UINavigationController(rootViewController: secondViewController)
navgitaionController1.title = "Second"
navgitaionController1.tabBarItem.image = UIImage.init(named: "second-icon-1")
var array = self.viewControllers
array?.append(navgitaionController1)
self.viewControllers = array
}
}
}
private lazy var tabbarViewController: UITabBarController = {
let tabbarViewController = UITabBarController()
tabbarViewController.setViewControllers([startVC,
offerVC,
benefitsVC,
shopVC,
recipesVC], animated: true)
return tabbarViewController
}()
window?.rootViewController = tabbarViewController