When minimizing a view, root controller contents also minimize swift - swift

Question

Hi there I am trying to recreate apple musics miniplayer controller. There is a view that shows details about the song playing such as the song name, artist name, cover art and so forth like apple music. When a user clicks the dismiss button on the top of that controller, it minimizes it to a view just above the tabBar revealing the rootview behind the view. The only problem is that my code is causing an issue that when the view is minimized, instead of minimizing the view that shows the information about the current song being played, it minimizes all the views and leaves just a black screen. I'm not sure what is causing the issue but I will provide the code for my tabBar controller which houses the code to minimize and maximize the view and then the other controller which calls the function created in the tabBar controller to minimze and maximize the view as well as screen shots of what is happening. Thank you for taking the time to look at this. If anything is unclear please let me know.
TabBarController Code:
import Foundation
import UIKit
import Firebase
class TabBarController: UITabBarController {
var user: User? {
didSet {
guard let nav = viewControllers?[0] as? UINavigationController else { return }
guard let feed = nav.viewControllers.first as? FeedController else { return }
feed.user = user
}
}
override func viewDidLoad() {
super.viewDidLoad()
fetchUser()
setupDetailsPlayerView()
// perform(#selector(minimizePlayerDetails), with: nil, afterDelay: 1)
// perform(#selector(maximizePlayerDetails), with: nil, afterDelay: 1)
}
#objc func minimizePlayerDetails() {
maximizeTopAnchorConstraint.isActive = false
minimizeTopAnchorConstraint.isActive = true
UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 0.7, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
// self.view.layoutIfNeeded()
})
}
#objc func maximizePlayerDetails() {
maximizeTopAnchorConstraint.isActive = true
maximizeTopAnchorConstraint.constant = 0
minimizeTopAnchorConstraint.isActive = false
UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 0.7, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
self.view.layoutIfNeeded()
})
}
func fetchUser() {
guard let uid = Auth.auth().currentUser?.uid else { return }
UserService.shared.fetchUser(uid: uid) { user in
self.user = user
}
}
let playerDetailsView = PlayerDetailController.initFromNib()
var maximizeTopAnchorConstraint: NSLayoutConstraint!
var minimizeTopAnchorConstraint: NSLayoutConstraint!
fileprivate func setupDetailsPlayerView() {
print("setting up details view")
// view.addSubview(playerDetailsView)
view.insertSubview(playerDetailsView, belowSubview: tabBar)
playerDetailsView.translatesAutoresizingMaskIntoConstraints = false
maximizeTopAnchorConstraint = playerDetailsView.topAnchor.constraint(equalTo: view.topAnchor, constant: view.frame.height)
maximizeTopAnchorConstraint.isActive = true
minimizeTopAnchorConstraint = playerDetailsView.topAnchor.constraint(equalTo: tabBar.topAnchor, constant: -64)
// minimizeTopAnchorConstraint.isActive = true
playerDetailsView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
playerDetailsView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
playerDetailsView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
}
}
function being called in songcontroller:
#IBAction func dismissTapped(_ sender: Any) {
guard let windowScene = UIApplication.shared.connectedScenes.first as? UIWindowScene,
let sceneDelegate = windowScene.delegate as? SceneDelegate
else {
return
}
let viewController = TabBarController()
sceneDelegate.window?.rootViewController = viewController
viewController.minimizePlayerDetails()
print("clicked")
self.removeFromSuperview()
}
Screenshots of what is happening:
Normal View:
Minimized View:

Answer 1

If you've created the TabBarController by storyboard then the empty initialization you've provided won't work. You need to instantiate the UIViewController from the storyboard. This seems to be the reason why you're getting an empty UITabBarController when setting the rootViewController. Modify your button action dismissTapped like this:
#IBAction func dismissTapped(_ sender: Any) {
//...
let viewController = UIStoryboard(name: "Main", bundle: nil)
.instantiateViewController(withIdentifier: "TabBarController") as? TabBarController
sceneDelegate.window?.rootViewController = viewController
//...
}