This question is really similar to this: How to set an app's UIWindow color when calling it from ViewController. However, the solutions there aren't working.
Ever since apple changed the window to be located in the scene delegate (instead of the app delegate) I haven't been able to change the window (UIWindow) background color outside of scene delegate (using the methods in the article above). Is there any way to either call a function inside of Scene Delegate (through a view controller) or to change the window background color in a view controller. The reason I need this feature is because I handle my themes inside of the app, and when the user changes the theme I need the UIWindow background color to also change (for all of my app) for any cases where the UIWindow color shows (ex: presenting a view controller). A solution which I've tried is:
if let window = UIApplication.shared.delegate?.window as? UIWindow {
window.backgroundColor = .red
}
But it doesn't work for me.
You can change it in any controller like this
override func viewDidAppear(_ animated: Bool) {
view.window?.backgroundColor = .red
}
A tableview controller is embedded into a navigation controller.
I programmatically added a search bar to the tableview controller's navigation bar. I only changed the navigation bar Background color into something different than Default (purple) - all the rest I left default.
class TableViewController: UITableViewController {
let searchController = UISearchController(searchResultsController: nil)
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.hidesSearchBarWhenScrolling = true
navigationItem.searchController = searchController
}
}
Code above is reduced to bare minimum for demonstration purpose.
All done with Xcode 11 (11A420a).
I ran the project in iOS 12.0 and 13.0 simulators and devices.
iOS 13.0
The search bar shows upon start.
Navigation bar background color is correctly presented.
While scrolling, navigation bar background color remains correct.
With iOS 13.0, all works as expected!
iOS 12.0
The search bar doesn't show upon start.
Navigation bar background color is correctly presented.
While scrolling, navigation bar background color goes white as soon search bar is visible.
I tried to change all kind of color setting in storyboard as well as properties programmatically. I didn't succeed in changing the navigation bar background color when search bar is visible.
It seems (?!) that the navigation bar foreground looses transparency when search bar becomes visible.
If I use a Bar Tint color of the navigation bar (!= Default), all works as expected (and as with iOS 13.0), but I loose the gradient effect, which I would like to keep.
What did I miss?
How can I avoid this?
Bug?
I had some luck with the navigationItem.scrollEdgeAppearance property when facing a similar problem. For example:
vc.navigationItem.scrollEdgeAppearance?.backgroundColor = .red
This is only available on iOS 13 though.
Here's what I ended up doing to get correct colors in the navigation bar while allowing the search controller's scroll bar to hide during scroll:
if #available(iOS 13.0, *) {
let blurEffect = UIBlurEffect(style: .systemUltraThinMaterial)
navbar.standardAppearance.backgroundEffect = blurEffect
navbar.standardAppearance.backgroundColor = appMainColor.withAlphaComponent(0.75)
navbar.standardAppearance.titleTextAttributes = [NSAttributedString.Key.foregroundColor : UIColor.white]
navbar.compactAppearance = nil
navbar.scrollEdgeAppearance = navbar.standardAppearance.copy()
navitem.standardAppearance = nil
navitem.compactAppearance = nil
navitem.scrollEdgeAppearance = nil
}
I don't know if it is the look you're going for but I found if you disable hideSearchBarWhenScrolling the background stops changing color. However, the search bar is always there.
Add this to viewDidLoad():
navigationItem.hidesSearchBarWhenScrolling = false
I've been trying to implement Apple Music like transparent navigation bar for pushed view controller. There are a lot of solutions on Internet saying place the code below into viewDidLoad:
navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
navigationController?.navigationBar.shadowImage = UIImage()
But the thing is that it only works for root controller, e.g. UITableViewController with a list of items. When I tap on an item and open it's details I expect to see transparent navigation bar, but after appearing it becomes solid (not even translucent). Even setting barTintColor does not help.
What am i doing wrong? Or is it a known issue in iOS 11? It used to work before...
I confirm that transparent navigation bar is not working in iOS 11 for pushed viewcontroller, instead just appears black without translucent #screenshot.
Firstly, I have filed this bug report, lastly :) I found a quick workaround that presenting and dismissing a UIViewcontroller fixes this issue, as following:
if (self.navigationController!.viewControllers.count > 1) {
if #available(iOS 11.0, *) {
self.present(UIViewController(), animated: true, completion: {
self.dismiss(animated: false)
})
self.scrollView.contentInsetAdjustmentBehavior = .never
} else {
self.automaticallyAdjustsScrollViewInsets = false
}
self.extendedLayoutIncludesOpaqueBars = false
}
I am using above code in viewWillAppear and my UI is being generated programatically without storyboard or xib, so it works seamlessly :) and glad I get expected result #screenshot
Looking into setting up a parentViewController with a segmentedControl to switch between two (or more) viewControllers, I found this excellent tutorial: https://cocoacasts.com/managing-view-controllers-with-container-view-controllers/
I then added UITableViewController as one of the childViewControllers.
So far so good.
Then I added a UISearchController and added the searchBar as recommended by Apple:
if #available(iOS 11.0, *) {
self.navigationItem.searchController = searchController
} else {
tableView.tableHeaderView = searchController.searchBar
}
But because there is already a UISegmentedControl in the navigationBar (set up in the storyBoard), the searchBar doesn't show up. I can fall back to the pre iOS 11 method, and the searchBar is now visible in the tableView header, but of course it doesn't have the iOS 11 look anymore.
Is it possible to have both the segmentedControl and searchBar in the navigationBar?
EDIT:
I also tried using the titleView for the segmentedControl, but still, the searchBar does not show up.
One workaround may be to change the appearance of the iOS 10 searchBar, but that would still not feel right.
Referred here and here. No answer in first link. In the second link, though the answer is not accepted, but the link to apple developer forum gives error.
Before iOS 11 :
iOS 11 :
Note : Same device same code.
Also, this would mean, all apps using this feature have to be republished ?
Adding these lines fixed it for me:
override func viewDidLayoutSubviews() {
self.searchController.searchBar.sizeToFit()
}
I can get the initial appearance to display correctly in iOS11 using the following code (as per greg's answer):
[self.searchController.searchBar sizeToFit];
if (#available(iOS 11.0, *)) {
self.navigationItem.searchController = self.searchController;
self.navigationItem.hidesSearchBarWhenScrolling = NO;
} else {
// Fallback on earlier versions
self.tableView.tableHeaderView = self.searchController.searchBar;
}
However, if the app is backgrounded then restored while the search bar was active, the appearance would end up overlapped as shown in Nitish's second screenshot above.
I was able to fix that with the following workaround:
[[NSNotificationCenter defaultCenter] addObserverForName:UIApplicationDidBecomeActiveNotification object:nil queue:nil usingBlock:^(NSNotification * _Nonnull note) {
self.searchController.searchBar.showsScopeBar = NO;
[self.searchController.searchBar sizeToFit];
self.searchController.searchBar.showsScopeBar = YES;
[self.searchController.searchBar sizeToFit];
}];
(I'm still working on how to workaround the layout issues following an interface orientation change while the search bar is active - that still ends up overlapped.)
In the radar that Ray Wenderlich filed, #benck posted this answer from WWDC, which, if I'm not mistaken, hasn't been posted yet.
Per your comments, your UISearchController's UISearchBar has been assigned to your UITableView's tableHeaderView. In iOS 11, you should instead be assigning your UISearchController to the searchController property of your view's navigationItem. You no longer need to assign the UISearchBar anywhere. See Apple's documentation on this new property.
I met the same issue on my app, my solution is in iOS 11, using apple suggested new way for searchBar which is in navigationItem, otherwise, using the old way. My code in viewDidLoad() as below:
if #available(iOS 11.0, *) {
navigationController?.navigationBar.prefersLargeTitles = false
navigationItem.searchController = searchController
navigationItem.hidesSearchBarWhenScrolling = false
searchViewHeight.constant = 0
} else {
searchView.addSubview(searchController.searchBar)
}
I have two IBOutlets: searchView and searchViewHeight:
#IBOutlet var searchView: UIView!
#IBOutlet var searchViewHeight: NSLayoutConstraint! // new added for iOS 11
Before iOS 11, my viewController's hierarchy as below:
I have a searchView which height is 44 to contains my searchController's searchBar view. It's under navigation bar.
In iOS 11, I add a new IBOutlet for searchView's height constraint, and set its constant to 0, hide this container view. And add searchController as a part of navigation item.
See apple's document:
https://developer.apple.com/documentation/uikit/uinavigationitem/2897305-searchcontroller
One more thing is under iOS 11, the searchBar's textField background color is little darker than navigation bar color by default. For consistency, you can change it to white, the below code will work both for iOS11 and its prior:
if let textField = searchController.searchBar.value(forKey: "searchField") as? UITextField {
if let backgroundView = textField.subviews.first {
// Search bar textField background color
backgroundView.backgroundColor = UIColor.white
// Search bar textField rounded corner
backgroundView.layer.cornerRadius = 10
backgroundView.clipsToBounds = true
}
}
I think that the solution is to add the Search Bar in the Navigation Bar:
navigationController?.navigationBar.prefersLargeTitles = true // Navigation bar large titles
navigationItem.title = "Contacts"
navigationController?.navigationBar.largeTitleTextAttributes = [NSAttributedStringKey.foregroundColor : UIColor.white]
navigationController?.navigationBar.barTintColor = UIColor(displayP3Red: 0/255, green: 150/255, blue: 136/255, alpha: 1.0)
let searchController = UISearchController(searchResultsController: nil) // Search Controller
navigationItem.hidesSearchBarWhenScrolling = false
navigationItem.searchController = searchController
You can find an example for UISearchBarController - SearchBar and scope buttons overlap here.
I had the same issue in iOS 11.
Contrary to some of the comments here, if I look at your screenshots you DONT want to set it as the navigationItem because you don't have a UINavigationController setup.
Neither do you want to add the searchBar in the header of the tableView because for some reason it can't cope with the scopeBar
So what I did to fix it:
To get a UISearchBar with scopes over your tableView, use a UIViewController in interface builder not a UITableViewController.
Place a UISearchBar and a UITableView inside the view controller and wire them up properly (delegates, dataSource, etc).
Don't forget to change your swift file to UIViewController instead of UITableViewController as well and change it accordingly. (add a tableView property and connect it via IBOutlet, change the delegates for the tableView etc)
Then in interface builder, use autoLayout guides so the searchBar sits on top of the tableView
In interface builder when you activate the scope bar it will look totally weird but don't panic, it will be fine. I guess Apple screwed the rendering n interface builder when they changed the behavior to work with UINavigationController... anyway...
Then everything works as it should and look like this (in my case I present it the vc in a popover but that doesn't matter)