Is it possible to create a clear UINavigationBar class with isTranslucent = false ?
One way to do this is to change properties of UINavigationController on the viewDidLoad method of your viewController as follows :
override func viewDidLoad() {
super.viewDidLoad()
if let nav = self.navigationController {
nav.navigationBar.setBackgroundImage(UIImage(), for: .default)
nav.navigationBar.shadowImage = UIImage()
nav.navigationBar.isTranslucent = true
}
}
Related
faced such an issue that the navigation controller is always black even if I change the appearance to light.
Here is how I create it:
class TabBarController: UITabBarController {
override func viewDidLoad() {
super.viewDidLoad()
viewControllers = [
createViewController(for: AssetViewController(), title: NSLocalizedString("Assets", comment: ""), image: UIImage(systemName: "dollarsign.circle")!),
createViewController(for: WalletViewController(), title: NSLocalizedString("Wallets", comment: ""), image: UIImage(systemName: "wallet.pass")!),
]
}
func createViewController(for rootViewController: UIViewController, title: String, image: UIImage) -> UIViewController {
let navController = UINavigationController(rootViewController: rootViewController)
navController.tabBarItem.image = image
navController.navigationBar.prefersLargeTitles = true
rootViewController.navigationItem.title = title
return navController
}
ViewController:
class AssetViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .systemBackground
self.view = CustomView()
}
The other navigation controllers I build the same way, but they are 100% fine.
What could be the problem? Thanks.
Found the problem. I set the backgroundColor and afterward, I set the custom view. Should switch the order. Still weird why other VCs worked fine.
How can I change the back button of a certain navigation controller. I have tried to use
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.backBarButtonItem?.tintColor = UIColor.red
}
I know that if i use navigationController it will change the back button tint color on all of my view controllers.
Try this!!
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.navigationController?.navigationBar.tintColor = .red
}
override func willMove(toParent parent: UIViewController?) {
self.navigationController?.navigationBar.tintColor = // original color
}
}
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'm trying to change the title in Product but somehow the navigationItem is different. How come the navigationItem in Container is different compared to the one in Product?
class VC1: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let controller = Container()
let navigation = UINavigationController(rootViewController: controller)
navigationController?.pushViewController(navigation, animated: true)
}
}
class Container: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
print(navigationItem)
navigationItem.title = "test"
let controller = Product()
controller.didMove(toParentViewController: self)
self.addChildViewController(controller)
view.addSubview(controller.view)
}
}
class Product: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
print(navigationItem)
navigationItem.title = "" // Doesn't remove the title
}
}
I'm just reading the documentation for navigationItem, and it says this:
This is a unique instance of UINavigationItem created to represent the view controller when it is pushed onto a navigation controller.
However, in your case, the embedded VC is not a direct child of a navigation controller.
So, I tried the following code and it worked. The key part is I overrode navigationItem to return the parent's navigation item if there is a parent view controller.
override var navigationItem: UINavigationItem {
if let parentItem = parent?.navigationItem {
return parentItem
} else {
return super.navigationItem
}
}
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