Sample project can be found at https://github.com/SRowley90/LargeTitleIssueTestiOS
I am trying to position a segmented control below the Large title in an iOS app. I have a UIToolbar which contains the segmented control inside.
When scrolling up the title and toolbar behave as expected.
When scrolling down the navigation bar is correct, but it doesn't push the UITabBar or the UITableView down, meaning the title goes above the segmented control as can be seen in the images below.
I'm pretty sure it's something to do with the constraints I have set, but I can't figure out what.
The TabBar is fixed to the top, left and right.
The TableView is fixed to the bottom, left and right.
The tableView is fixed vertically to the TabBar
I have the position UITabBarDelegate method set:
func position(for bar: UIBarPositioning) -> UIBarPosition {
return .topAttached
}
Take the delegation of the tableView somewhere:
tableView.delegate = self
Override the scrollViewDidScroll and update toolbar position appearance (since the real position should not change according to have that nice bounce effect.
extension ViewController: UIScrollViewDelegate {
override func scrollViewDidScroll(_ scrollView: UIScrollView) {
var verticalOffset = scrollView.contentOffset.y + defaultNavigationBarHeight
if scrollView.refreshControl?.isRefreshing ?? false {
verticalOffset += 60 // After is refreshing changes its value the toolbar goes 60 points down
print(toolbar.frame.origin.y)
}
if verticalOffset >= 0 {
toolbar.transform = .identity
} else {
toolbar.transform = CGAffineTransform(translationX: 0, y: -verticalOffset)
}
}
}
You can use the following check before applying transformation to make it more reliable and natural to default iOS style:
if #available(iOS 11.0, *) {
guard let navigationController = navigationController else { return }
guard navigationController.navigationBar.prefersLargeTitles else { return }
guard navigationController.navigationItem.largeTitleDisplayMode != .never else { return }
}
Using UIScrollViewDelegate didn't work well with CollectionView and toolbar for me. So, I did:
final class CollectionViewController: UICollectionViewController {
private var observesBag: [NSKeyValueObservation] = []
private let toolbar = UIToolbar()
override func viewDidLoad() {
super.viewDidLoad()
let statusBarHeight = UIApplication.shared.statusBarFrame.height
let navigationBarHeight = navigationController?.navigationBar.frame.height ?? 0
let defaultNavigationBarHeight = statusBarHeight + navigationBarHeight
let observation = navigationController!
.navigationBar
.observe(\.center, options: NSKeyValueObservingOptions.new) { [weak self] navBar, _ in
guard let self = self else { return }
let newNavigatonBarHeight = navBar.frame.height + statusBarHeight
let yTranslantion = newNavigatonBarHeight - defaultNavigationBarHeight
if yTranslantion > 0 {
self.toolbar.transform = CGAffineTransform(
translationX: 0,
y: yTranslantion
)
} else {
self.toolbar.transform = .identity
}
}
observesBag.append(observation)
}
}
Observe the "center" of the navigationBar for changes and then translate the toolbar in the y-axis.
Even though it worked fine when I tried to use this solution with UIRefreshControl and Large Titles it didn't work well.
I set up the refresh control like:
private func setupRefreshControl() {
let refreshControl = UIRefreshControl()
self.webView.scrollView.refreshControl = refreshControl
}
the height of the UINavigationBar is changed after the complete refresh triggers.
I want a popover without rounded corners and with no arrow.
I have done the following code but it did not work:
//SerachPopViewController.swift
//MARK: InitCoder
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
//popover settings
//popoverPresentationController!.permittedArrowDirections = .Any
modalPresentationStyle = .Popover
popoverPresentationController!.delegate = self
//permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)
self.preferredContentSize = CGSize(width:340,height:380)
}
//QueryTableViewController.swift
#IBAction func searchFilter(sender: AnyObject) {
let searchPopController = storyboard!.instantiateViewControllerWithIdentifier("SerachPopViewController") as! SerachPopViewController
searchPopController.serachPopDelegate = self
searchPopController.modalPresentationStyle = .Popover
searchPopController.preferredContentSize = CGSize(width:340,height:380)
let popoverPresentationController = searchPopController.popoverPresentationController
popoverPresentationController!.sourceView = self.view;
popoverPresentationController!.sourceRect = CGRectMake(CGRectGetMidX(self.view.bounds), CGRectGetMidY(self.view.bounds),0,0)
popoverPresentationController!.permittedArrowDirections = UIPopoverArrowDirection();
self.presentViewController(searchPopController, animated: true, completion: nil)
}
I am able to display popover view with arrow and rounded arrow.
Please help me to achieve:
popup view with rectangle corner
popup view without direction arrows
Using the concept above, you can also set the corner radius in the completion parameter.
Swift 3
let popoverViewController: UIViewController = // Some view controller to be presented in a popover
// Set popover properties here...
// i.e. popoverViewController.modalPresentationStyle = .popover
present(popoverViewController, animated: true, completion: {
popoverViewController.view.superview?.layer.cornerRadius = 0
// Additional code here
})
In iOS 11 its not possible to use #SHN solution for removing rounded corners. The corner radius is set to default value after viewWillAppear.
Radius must be set in viewDidAppear method
override func viewDidAppear(_ animated: Bool) {
view.superview?.layer.cornerRadius = 0
super.viewDidAppear(animated)
}
To get popover without arrow when you are initiating popover, use:
popover!.permittedArrowDirections = UIPopoverArrowDirection(rawValue: 0)
For popover without corner radius, in the popover content view controller use:
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
// Do any additional setup after loading the view, typically from a nib.
self.view.superview?.layer.cornerRadius = 0.0;
}
I was not 100% happy with shawnynicole's answer because I realized the change from the rounded to the rectangular corners are notable/visible.
So I came up with this: subclass the view controller (in my case it was an UINavigationController) and override viewDidLayoutSubviews and update corners there. This is better because corners change animation is not visible and it will be updated every time needed (on rotations, etc).
It works in iOS11 and probably should work on others versions too.
class PopoverNavigationController: UINavigationController {
#IBInspectable var cornerRadius: Int = -1
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
let r = CGFloat(cornerRadius)
if r >= 0 && view.superview?.layer.cornerRadius != r {
view.superview?.layer.cornerRadius = r
}
}
}
I don't know why It does't work on my Simulator with iOS11.1 until trying setting backgroundColor.I added function viewWillTransition for rotating device.
override func viewDidAppear(_ animated: Bool) {
view.superview?.backgroundColor = UIColor.white
view.superview?.layer.cornerRadius = 0
super.viewDidAppear(animated)
}
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
view.superview?.backgroundColor = UIColor.white
view.superview?.layer.cornerRadius = 0
super.viewWillTransition(to: size, with: coordinator)
}
For Swift 4, in case you present your popover embedded in a navigation controller:
override func viewDidAppear(_ animated: Bool) {
navigationController?.view.superview?.layer.cornerRadius = 0
super.viewDidAppear(animated)
}
That's the way I do it in order to achieve such a functionality which works also on device rotation:
In the view controller that you set as a popover add the following code:
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
view.superview?.layer.cornerRadius = 0
}
extension MyPopoverViewController: UIPopoverPresentationControllerDelegate {
func popoverPresentationController(_ popoverPresentationController: UIPopoverPresentationController, willRepositionPopoverTo rect: UnsafeMutablePointer<CGRect>, in view: AutoreleasingUnsafeMutablePointer<UIView>) {
self.view.setNeedsLayout()
}
Finally, set your popover's delegate to the instance of this view controller before presenting it:
...
popover.delegate = myPopoverViewController
present(myPopoverViewController, animated: true)
Many of these answers fix the OP's question about corner radius, but you can get the same effect by changing your presented view controller's top view's background to clear. Then just round the corners of the next top view to the desired amount (or not, if you want it to be a straight top).
I prefer this way because it gives you more WYSIWYG control over the presented view. For example, you can present a floating square by just centering a view in the view controller and presenting it.
I am experiencing an annoying problem testing the newest iOS 11 on the iPhone X simulator.
I have an UITabBarController and inside each tab there is a UINavigationController, each UINavigationBar has defined also a bottom toolBar (setToolbarHidden:), and by default they show up at the bottom, just over the tabBar.
It has been working fine so far and seems to work fine also in the upcomming iPhone 8 and 8 Plus models, but on the iPhone X there is a gap between the toolBar and the tabBar. My guess is that the toolBar doesn't realize that is displayed inside a tabBar and then leaves the accommodating space at the bottom.
I guess the only way to fix it would be using a custom toolbar and display/animate it myself instead of using the defaults UINavigationBar, but I would like to hear other options :)
This is how it looks on iPhone 8.
And here is the problem on iPhone X.
I filed this as radr://problem/34421298, which was closed as a duplicate of radr://problem/34462371. However, in the latest beta of Xcode 9.2 (9C32c) with iOS 11.2, this seems to be fixed. Here's an example of my app running in the simulator of each device, with no changes in between.
This isn't really a solution to your problem, other than that some patience may solve it without needing to resort to UI trickery. My assumption is that iOS 11.2 will be out before the end of the year, since it's needed to support HomePod.
If you don't consider rotations you can try to manipulate the layer of the toolbar as a very hacky yet fast workaround.
class FixNavigationController: UINavigationController
{
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
updateTollbarPosition()
}
func updateTollbarPosition() {
guard let tabbarFrame = tabBarController?.tabBar.frame else {
return
}
let gapHeight = tabbarFrame.origin.y-toolbar.frame.origin.y-toolbar.frame.size.height
var
frame = toolbar.layer.frame
frame.origin.y += gapHeight
toolbar.layer.frame = frame
}
}
Unfortunately, rotation animation doesn't look good when it comes to this approach. In this case, adding the custom toolbar instead of the standard one will be a better solution.
I have found only one workaround: add toolbar directly to the view controller
iOS 11.1 and iPhone X are released and this bug/feature isn't fixed yet. So I implemented this workaround. This code works in iOS 9.0+.
Just set this class in your storyboard as navigation controller's class. It will use custom toolbar in iPhone X with correct layout constraints, and falls back to native one in other devices. The custom toolbar is added to navigation controller's view instead of your view controller, to make transitions smoother.
Important Note: You have to call updateItems(animated:) manually after setting toolbarItems of your view controller to update interface. If you set toolbarItems property of navigation controller, you can ignore this step.
It simulates all native toolbar behavior (including changing toolbar height in portrait/landscape modes), except push/pop animations.
import UIKit
class FixNavigationController: UINavigationController {
private weak var alterToolbarHeightConstraint: NSLayoutConstraint?
private var _alterToolbar: UIToolbar?
private func initAlretToolbar() {
_alterToolbar = UIToolbar()
_alterToolbar!.isTranslucent = true
_alterToolbar!.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(_alterToolbar!)
if view.traitCollection.verticalSizeClass == .compact {
alterToolbarHeightConstraint = _alterToolbar!.heightAnchor.constraint(equalToConstant: 32.0)
} else {
alterToolbarHeightConstraint = _alterToolbar!.heightAnchor.constraint(equalToConstant: 44.0)
}
let bottomAnchor: NSLayoutConstraint
if #available(iOS 11.0, *) {
bottomAnchor = _alterToolbar!.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)
} else {
bottomAnchor = _alterToolbar!.bottomAnchor.constraint(equalTo: bottomLayoutGuide.topAnchor)
}
NSLayoutConstraint.activate([
_alterToolbar!.leadingAnchor.constraint(equalTo: view.leadingAnchor),
_alterToolbar!.trailingAnchor.constraint(equalTo: view.trailingAnchor),
bottomAnchor,
alterToolbarHeightConstraint!
])
self.view.updateFocusIfNeeded()
self.view.layoutIfNeeded()
}
private var alterToolbarInSuper: UIToolbar? {
var superNavigationController = self.navigationController as? FixNavigationController
while superNavigationController != nil {
if superNavigationController?._alterToolbar != nil {
return superNavigationController?._alterToolbar
}
superNavigationController = superNavigationController?.navigationController as? FixNavigationController
}
return nil
}
private var alterToolbar: UIToolbar! {
get {
if let t = alterToolbarInSuper {
return t
}
if _alterToolbar == nil {
initAlretToolbar()
}
return _alterToolbar
}
}
// This is the logic to determine should use custom toolbar or fallback to native one
private var shouldUseAlterToolbar: Bool {
// return true if height is iPhone X's one
return UIScreen.main.nativeBounds.height == 2436
}
/// Manually call it after setting toolbar items in child view controllers
func updateItems(animated: Bool = false) {
if shouldUseAlterToolbar {
(_alterToolbar ?? alterToolbarInSuper)?.setItems(viewControllers.last?.toolbarItems ?? toolbarItems, animated: animated)
}
}
override var isToolbarHidden: Bool {
get {
if shouldUseAlterToolbar {
return _alterToolbar == nil && alterToolbarInSuper == nil
} else {
return super.isToolbarHidden
}
}
set {
if shouldUseAlterToolbar {
if newValue {
super.isToolbarHidden = newValue
_alterToolbar?.removeFromSuperview()
_alterToolbar = nil
self.view.updateFocusIfNeeded()
self.view.layoutIfNeeded()
// TODO: Animation when push/pop
alterToolbarHeightConstraint = nil
var superNavigationController = self.navigationController as? FixNavigationController
while let superNC = superNavigationController {
if superNC._alterToolbar != nil {
superNC._alterToolbar?.removeFromSuperview()
superNC._alterToolbar = nil
superNC.view.updateFocusIfNeeded()
superNC.view.layoutIfNeeded()
}
superNavigationController = superNC.navigationController as? FixNavigationController
}
} else {
alterToolbar.setItems(viewControllers.last?.toolbarItems ?? toolbarItems, animated: false)
}
} else {
super.isToolbarHidden = newValue
}
}
}
override func setToolbarItems(_ toolbarItems: [UIBarButtonItem]?, animated: Bool) {
super.setToolbarItems(toolbarItems, animated: animated)
updateItems(animated: animated)
}
override var toolbarItems: [UIBarButtonItem]? {
get {
return super.toolbarItems
}
set {
super.toolbarItems = newValue
updateItems()
}
}
override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
guard let _alterToolbar = _alterToolbar else {
return
}
self.alterToolbarHeightConstraint?.isActive = false
let height: CGFloat = (view.traitCollection.verticalSizeClass == .compact) ? 32.0 : 44.0
let alterToolbarHeightConstraint = _alterToolbar.heightAnchor.constraint(equalToConstant: height)
alterToolbarHeightConstraint.isActive = true
self.alterToolbarHeightConstraint = alterToolbarHeightConstraint
}
}
Apple still has not yet fixed this bug in iOS 11.2. Derived from Mousavian's solution, here is a simpler approach that I took.
I took this approach because I have just one UITableViewController where this bug happens. So in my case, I just added the following code listed below to my ViewController (which is UITableViewController) where this bug happens.
Advantages are:
This fix just takes over in case of an iPhone X. No side effects to expect on other devices
Works with any transition
Works regardless of other parent/child controllers having Toolbars or not
Simple
And here is the code:
1.Add startFixIPhoneXToolbarBug to your viewWillAppear like this:
override func viewWillAppear(_ animated: Bool)
{
super.viewWillAppear(animated)
startFixIPhoneXToolbarBug()
}
2.Add endFixIPhoneXToolbarBug to your viewWillDisappear like this:
override func viewWillDisappear(_ animated: Bool)
{
super.viewWillDisappear(animated)
endFixIPhoneXToolbarBug()
}
3.Implement start/endFixIPhoneXToolbarBug in your viewController like this:
private var alterToolbarHeightConstraint: NSLayoutConstraint? = nil
private var alterToolbar: UIToolbar? = nil
func startFixIPhoneXToolbarBug()
{
// Check if we are running on an iPhone X
if UIScreen.main.nativeBounds.height != 2436
{
return // No
}
// See if we have a Toolbar
if let tb:UIToolbar = self.navigationController?.toolbar
{
// See if we already added our own
if alterToolbar == nil
{
// Should always be the case
if let tbView = tb.superview
{
// Create a new Toolbar and apply correct constraints
alterToolbar = UIToolbar()
alterToolbar!.isTranslucent = true
alterToolbar!.translatesAutoresizingMaskIntoConstraints = false
tb.isHidden = true
tbView.addSubview(alterToolbar!)
if tbView.traitCollection.verticalSizeClass == .compact
{
alterToolbarHeightConstraint = alterToolbar!.heightAnchor.constraint(equalToConstant: 32.0)
}
else
{
alterToolbarHeightConstraint = alterToolbar!.heightAnchor.constraint(equalToConstant: 44.0)
}
let bottomAnchor: NSLayoutConstraint
if #available(iOS 11.0, *)
{
bottomAnchor = alterToolbar!.bottomAnchor.constraint(equalTo: tbView.safeAreaLayoutGuide.bottomAnchor)
}
else
{
bottomAnchor = alterToolbar!.bottomAnchor.constraint(equalTo: bottomLayoutGuide.topAnchor)
}
NSLayoutConstraint.activate([
alterToolbar!.leadingAnchor.constraint(equalTo: tbView.leadingAnchor),
alterToolbar!.trailingAnchor.constraint(equalTo: tbView.trailingAnchor),
bottomAnchor,
alterToolbarHeightConstraint!
])
tbView.updateFocusIfNeeded()
tbView.layoutIfNeeded()
}
}
// Add the original items to the new toolbox
alterToolbar!.setItems(tb.items, animated: false)
}
}
func endFixIPhoneXToolbarBug()
{
if alterToolbar != nil
{
alterToolbar!.removeFromSuperview()
alterToolbar = nil
alterToolbarHeightConstraint = nil
if let tb:UIToolbar = self.navigationController?.toolbar
{
tb.isHidden = false
}
}
}
So I have a button that is connected to a IBAction. When I press the button I want to hide the tab bar in my iOS app with a animation. This [self setTabBarHidden:hidden animated:NO]; or this [self.tabBarController setTabBarHidden:hidden animated:YES]; does not work. This is my code without the animation:
- (IBAction)picture1:(id)sender {
[self.tabBarController.tabBar setHidden:YES];
}
Any help would be greatly appreciated :D
When working with storyboard its easy to setup the View Controller to hide the tabbar on push, on the destination View Controller just select this checkbox:
I try to keep view animations available to me using the following formula:
// pass a param to describe the state change, an animated flag and a completion block matching UIView animations completion
- (void)setTabBarVisible:(BOOL)visible animated:(BOOL)animated completion:(void (^)(BOOL))completion {
// bail if the current state matches the desired state
if ([self tabBarIsVisible] == visible) return (completion)? completion(YES) : nil;
// get a frame calculation ready
CGRect frame = self.tabBarController.tabBar.frame;
CGFloat height = frame.size.height;
CGFloat offsetY = (visible)? -height : height;
// zero duration means no animation
CGFloat duration = (animated)? 0.3 : 0.0;
[UIView animateWithDuration:duration animations:^{
self.tabBarController.tabBar.frame = CGRectOffset(frame, 0, offsetY);
} completion:completion];
}
//Getter to know the current state
- (BOOL)tabBarIsVisible {
return self.tabBarController.tabBar.frame.origin.y < CGRectGetMaxY(self.view.frame);
}
//An illustration of a call to toggle current state
- (IBAction)pressedButton:(id)sender {
[self setTabBarVisible:![self tabBarIsVisible] animated:YES completion:^(BOOL finished) {
NSLog(#"finished");
}];
}
does not longer work on iOS14, see updated 2nde answer below
Swift 3.0 version, using an extension:
extension UITabBarController {
private struct AssociatedKeys {
// Declare a global var to produce a unique address as the assoc object handle
static var orgFrameView: UInt8 = 0
static var movedFrameView: UInt8 = 1
}
var orgFrameView:CGRect? {
get { return objc_getAssociatedObject(self, &AssociatedKeys.orgFrameView) as? CGRect }
set { objc_setAssociatedObject(self, &AssociatedKeys.orgFrameView, newValue, .OBJC_ASSOCIATION_COPY) }
}
var movedFrameView:CGRect? {
get { return objc_getAssociatedObject(self, &AssociatedKeys.movedFrameView) as? CGRect }
set { objc_setAssociatedObject(self, &AssociatedKeys.movedFrameView, newValue, .OBJC_ASSOCIATION_COPY) }
}
override open func viewWillLayoutSubviews() {
super.viewWillLayoutSubviews()
if let movedFrameView = movedFrameView {
view.frame = movedFrameView
}
}
func setTabBarVisible(visible:Bool, animated:Bool) {
//since iOS11 we have to set the background colour to the bar color it seams the navbar seams to get smaller during animation; this visually hides the top empty space...
view.backgroundColor = self.tabBar.barTintColor
// bail if the current state matches the desired state
if (tabBarIsVisible() == visible) { return }
//we should show it
if visible {
tabBar.isHidden = false
UIView.animate(withDuration: animated ? 0.3 : 0.0) {
//restore form or frames
self.view.frame = self.orgFrameView!
//errase the stored locations so that...
self.orgFrameView = nil
self.movedFrameView = nil
//...the layoutIfNeeded() does not move them again!
self.view.layoutIfNeeded()
}
}
//we should hide it
else {
//safe org positions
orgFrameView = view.frame
// get a frame calculation ready
let offsetY = self.tabBar.frame.size.height
movedFrameView = CGRect(x: 0, y: 0, width: self.view.frame.width, height: self.view.frame.height + offsetY)
//animate
UIView.animate(withDuration: animated ? 0.3 : 0.0, animations: {
self.view.frame = self.movedFrameView!
self.view.layoutIfNeeded()
}) {
(_) in
self.tabBar.isHidden = true
}
}
}
func tabBarIsVisible() ->Bool {
return orgFrameView == nil
}
}
This is based on the input from Sherwin Zadeh after a few hours of playing around.
Instead of moving the tabbar itself it moves the frame of the view, this effectively slides the tabbar nicely out of the bottom of the screen but...
... has the advantage that the content displayed inside the UITabbarcontroller is then also taking the full screen!
note its also using the AssociatedObject functionality to attached data to the UIView without subclassing and thus an extension is possible (extensions do not allow stored properties)
As per Apple docs, hidesBottomBarWhenPushed property of UIViewController, a Boolean value, indicating whether the toolbar at the bottom of the screen is hidden when the view controller is pushed on to a navigation controller.
The value of this property on the topmost view controller determines whether the toolbar is visible.
The recommended approach to hide tab bar would as follows
ViewController *viewController = [[ViewController alloc] init];
viewController.hidesBottomBarWhenPushed = YES; // This property needs to be set before pushing viewController to the navigationController's stack.
[self.navigationController pushViewController:viewController animated:YES];
However, note this approach will only be applied to respective viewController and will not be propagated to other view controllers unless you start setting the same hidesBottomBarWhenPushed property in other viewControllers before pushing it to the navigation controller's stack.
Swift Version:
#IBAction func tap(sender: AnyObject) {
setTabBarVisible(!tabBarIsVisible(), animated: true, completion: {_ in })
}
// pass a param to describe the state change, an animated flag and a completion block matching UIView animations completion
func setTabBarVisible(visible: Bool, animated: Bool, completion:(Bool)->Void) {
// bail if the current state matches the desired state
if (tabBarIsVisible() == visible) {
return completion(true)
}
// get a frame calculation ready
let height = tabBarController!.tabBar.frame.size.height
let offsetY = (visible ? -height : height)
// zero duration means no animation
let duration = (animated ? 0.3 : 0.0)
UIView.animateWithDuration(duration, animations: {
let frame = self.tabBarController!.tabBar.frame
self.tabBarController!.tabBar.frame = CGRectOffset(frame, 0, offsetY);
}, completion:completion)
}
func tabBarIsVisible() -> Bool {
return tabBarController!.tabBar.frame.origin.y < CGRectGetMaxY(view.frame)
}
[Swift4.2]
Just created an extension for UITabBarController:
import UIKit
extension UITabBarController {
func setTabBarHidden(_ isHidden: Bool, animated: Bool, completion: (() -> Void)? = nil ) {
if (tabBar.isHidden == isHidden) {
completion?()
}
if !isHidden {
tabBar.isHidden = false
}
let height = tabBar.frame.size.height
let offsetY = view.frame.height - (isHidden ? 0 : height)
let duration = (animated ? 0.25 : 0.0)
let frame = CGRect(origin: CGPoint(x: tabBar.frame.minX, y: offsetY), size: tabBar.frame.size)
UIView.animate(withDuration: duration, animations: {
self.tabBar.frame = frame
}) { _ in
self.tabBar.isHidden = isHidden
completion?()
}
}
}
For Xcode 11.3 and iOS 13 other answers didn't work for me. However, based on those I've came up to the new solution using CGAffineTransform
I didn't test this code well, but this might actually work.
extension UITabBarController {
func setTabBarHidden(_ isHidden: Bool) {
if !isHidden { tabBar.isHidden = false }
let height = tabBar.frame.size.height
let offsetY = view.frame.height - (isHidden ? 0 : height)
tabBar.transform = CGAffineTransform(translationX: 0, y: offsetY)
UIView.animate(withDuration: 0.25, animations: {
self.tabBar.transform = .identity
}) { _ in
self.tabBar.isHidden = isHidden
}
}
}
Hope that helps.
UPDATE 09.03.2020:
I've finally found an awesome implementation of hiding tab bar with animation. It's huge advantage it's able to work either in common cases and in custom navigation controller transitions. Since author's blog is quite unstable, I'll leave the code below. Original source: https://www.iamsim.me/hiding-the-uitabbar-of-a-uitabbarcontroller/
Implementation:
extension UITabBarController {
/**
Show or hide the tab bar.
- Parameter hidden: `true` if the bar should be hidden.
- Parameter animated: `true` if the action should be animated.
- Parameter transitionCoordinator: An optional `UIViewControllerTransitionCoordinator` to perform the animation
along side with. For example during a push on a `UINavigationController`.
*/
func setTabBar(
hidden: Bool,
animated: Bool = true,
along transitionCoordinator: UIViewControllerTransitionCoordinator? = nil
) {
guard isTabBarHidden != hidden else { return }
let offsetY = hidden ? tabBar.frame.height : -tabBar.frame.height
let endFrame = tabBar.frame.offsetBy(dx: 0, dy: offsetY)
let vc: UIViewController? = viewControllers?[selectedIndex]
var newInsets: UIEdgeInsets? = vc?.additionalSafeAreaInsets
let originalInsets = newInsets
newInsets?.bottom -= offsetY
/// Helper method for updating child view controller's safe area insets.
func set(childViewController cvc: UIViewController?, additionalSafeArea: UIEdgeInsets) {
cvc?.additionalSafeAreaInsets = additionalSafeArea
cvc?.view.setNeedsLayout()
}
// Update safe area insets for the current view controller before the animation takes place when hiding the bar.
if hidden, let insets = newInsets { set(childViewController: vc, additionalSafeArea: insets) }
guard animated else {
tabBar.frame = endFrame
return
}
// Perform animation with coordinato if one is given. Update safe area insets _after_ the animation is complete,
// if we're showing the tab bar.
weak var tabBarRef = self.tabBar
if let tc = transitionCoordinator {
tc.animateAlongsideTransition(in: self.view, animation: { _ in tabBarRef?.frame = endFrame }) { context in
if !hidden, let insets = context.isCancelled ? originalInsets : newInsets {
set(childViewController: vc, additionalSafeArea: insets)
}
}
} else {
UIView.animate(withDuration: 0.3, animations: { tabBarRef?.frame = endFrame }) { didFinish in
if !hidden, didFinish, let insets = newInsets {
set(childViewController: vc, additionalSafeArea: insets)
}
}
}
}
/// `true` if the tab bar is currently hidden.
var isTabBarHidden: Bool {
return !tabBar.frame.intersects(view.frame)
}
}
If you're dealing with custom navigation transitions just pass a transitionCoordinator property of "from" controller, so animations are in sync:
from.tabBarController?.setTabBar(hidden: true, along: from.transitionCoordinator)
Note, that in such case the initial solution work very glitchy.
I went through the previous posts, so I came out with the solution below as subclass of UITabBarController
Main points are:
Written in Swift 5.1
Xcode 11.3.1
Tested on iOS 13.3
Simulated on iPhone 11 and iPhone 8 (so with and without notch)
Handles the cases where the user taps on the different tabs
Handles the cases where we programmatically change the value of selectedIndex
Handles the view controller orientation changes
Handles the corner casere where the app moved to background and back to foreground
Below the subclass TabBarController:
class TabBarController: UITabBarController {
//MARK: Properties
private(set) var isTabVisible:Bool = true
private var visibleTabBarFrame:CGRect = .zero
private var hiddenTabBarFrame:CGRect = .zero
override var selectedIndex: Int {
didSet { self.updateTabBarFrames() }
}
//MARK: View lifecycle
override func viewDidLoad() {
super.viewDidLoad()
self.delegate = self
NotificationCenter.default.addObserver(self, selector: #selector(appWillEnterForeground(_:)), name: UIApplication.willEnterForegroundNotification, object: nil)
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
self.calculateTabBarFrames()
}
override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
super.viewWillTransition(to: size, with: coordinator)
coordinator.animate(alongsideTransition: { (_) in }) { (_) in
// when orientation changes, the tab bar frame changes, so we need to update it to the expected state
self.calculateTabBarFrames()
self.updateTabBarFrames()
}
}
#objc private func appWillEnterForeground(_ notification:Notification){
self.updateTabBarFrames()
}
//MARK: Private
/// Calculates the frames of the tab bar and the expected bounds of the shown view controllers
private func calculateTabBarFrames() {
self.visibleTabBarFrame = self.tabBar.frame
self.hiddenTabBarFrame = CGRect(x: self.visibleTabBarFrame.origin.x, y: self.visibleTabBarFrame.origin.y + self.visibleTabBarFrame.height, width: self.visibleTabBarFrame.width, height: self.visibleTabBarFrame.height)
}
/// Updates the tab bar and shown view controller frames based on the current expected tab bar visibility
/// - Parameter tabIndex: if provided, it will update the view frame of the view controller for this tab bar index
private func updateTabBarFrames(tabIndex:Int? = nil) {
self.tabBar.frame = self.isTabVisible ? self.visibleTabBarFrame : self.hiddenTabBarFrame
if let vc = self.viewControllers?[tabIndex ?? self.selectedIndex] {
vc.additionalSafeAreaInsets.bottom = self.isTabVisible ? 0.0 : -(self.visibleTabBarFrame.height - self.view.safeAreaInsets.bottom)
}
self.view.layoutIfNeeded()
}
//MARK: Public
/// Show/Hide the tab bar
/// - Parameters:
/// - show: whether to show or hide the tab bar
/// - animated: whether the show/hide should be animated or not
func showTabBar(_ show:Bool, animated:Bool = true) {
guard show != self.isTabVisible else { return }
self.isTabVisible = show
guard animated else {
self.tabBar.alpha = show ? 1.0 : 0.0
self.updateTabBarFrames()
return
}
UIView.animate(withDuration: 0.25, delay: 0.0, options: [.beginFromCurrentState,.curveEaseInOut], animations: {
self.tabBar.alpha = show ? 1.0 : 0.0
self.updateTabBarFrames()
}) { (_) in }
}
}
extension TabBarController: UITabBarControllerDelegate {
override func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
if let tabIndex = self.tabBar.items?.firstIndex(of: item) {
self.updateTabBarFrames(tabIndex: tabIndex)
}
}
}
Sample usage from within a shown view controller:
// hide the tab bar animated (default)
(self.tabBarController as? TabBarController)?.showTabBar(false)
// hide the tab bar without animation
(self.tabBarController as? TabBarController)?.showTabBar(false, animated:false)
Sample output iPhone 11
Sample output iPhone 8
EDIT :
Updated the code to respect the safe area bottom inset
If you're experiencing issues with this solution and your tab bar contains a navigation controller as direct child in the viewControllers array, you may want to make sure that the navigation controller topViewController has the property extendedLayoutIncludesOpaqueBars set to true (you can set this directly from the Storyboard). This should resolve the problem
Hope it helps someone :)
Rewrite Sherwin Zadeh's answer in Swift 4:
/* tab bar hide/show animation */
extension AlbumViewController {
// pass a param to describe the state change, an animated flag and a completion block matching UIView animations completion
func setTabBarVisible(visible: Bool, animated: Bool, completion: ((Bool)->Void)? = nil ) {
// bail if the current state matches the desired state
if (tabBarIsVisible() == visible) {
if let completion = completion {
return completion(true)
}
else {
return
}
}
// get a frame calculation ready
let height = tabBarController!.tabBar.frame.size.height
let offsetY = (visible ? -height : height)
// zero duration means no animation
let duration = (animated ? kFullScreenAnimationTime : 0.0)
UIView.animate(withDuration: duration, animations: {
let frame = self.tabBarController!.tabBar.frame
self.tabBarController!.tabBar.frame = frame.offsetBy(dx: 0, dy: offsetY)
}, completion:completion)
}
func tabBarIsVisible() -> Bool {
return tabBarController!.tabBar.frame.origin.y < view.frame.maxY
}
}
Try to set the frame of the tabBar in animation. See this tutorial.
Just be aware, it's bad practice to do that, you should set show/hide tabBar when UIViewController push by set the property hidesBottomBarWhenPushed to YES.
tried in swift 3.0 / iOS10 / Xcode 8:
self.tabBarController?.tabBar.isHidden = true
I set it when my controller is shown: (and Hide when back, after navigation)
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.tabBarController?.tabBar.isHidden = false
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
self.tabBarController?.tabBar.isHidden = true
}
BTW: better to have a flag to save if shown or not, as other vents can eventually trigger hide/show
Unfortunately, I can't comment on HixField's answer because I don't have enough reputation, so I have to leave this as a separate answer.
His answer is missing the computed property for movedFrameView, which is:
var movedFrameView:CGRect? {
get { return objc_getAssociatedObject(self, &AssociatedKeys.movedFrameView) as? CGRect }
set { objc_setAssociatedObject(self, &AssociatedKeys.movedFrameView, newValue, .OBJC_ASSOCIATION_COPY) }
}
My previous answer does not longer work on iOS14.
I played with manipulating the frames of the different views, but it seams that the new implementation of the UITabBarController and UITabBar on iOS14 do some magic under the covers which makes this approach no longer working.
I therefore switch to the approach that I hide the UITabBar by setting its alpha to zero and then I manipulate the bottom constraint (that you must pass in when calling the function) to bring the view's content down. This does however, mean that you must have such a constraint and the extension is more bound to your view then the previous approach.
Make sure that the view you are displaying has clipToBounds = false otherwise you will just get a black area where the UITabBar once was!
Here is the code of my UITabBarController.extensions.swift:
import Foundation
extension UITabBarController {
private struct AssociatedKeys {
// Declare a global var to produce a unique address as the assoc object handle
static var orgConstraintConstant: UInt8 = 0
static var orgTabBarAlpha : UInt8 = 1
}
var orgConstraintConstant: CGFloat? {
get { return objc_getAssociatedObject(self, &AssociatedKeys.orgConstraintConstant) as? CGFloat }
set { objc_setAssociatedObject(self, &AssociatedKeys.orgConstraintConstant, newValue, .OBJC_ASSOCIATION_COPY) }
}
var orgTabBarAlpha: CGFloat? {
get { return objc_getAssociatedObject(self, &AssociatedKeys.orgTabBarAlpha) as? CGFloat }
set { objc_setAssociatedObject(self, &AssociatedKeys.orgTabBarAlpha, newValue, .OBJC_ASSOCIATION_COPY) }
}
func setTabBarVisible(visible:Bool, animated:Bool, bottomConstraint: NSLayoutConstraint) {
// bail if the current state matches the desired state
if (tabBarIsVisible() == visible) { return }
//define segment animation duration (note we have two segments so total animation time = times 2x)
let segmentAnimationDuration = animated ? 0.15 : 0.0
//we should show it
if visible {
//animate moving up
UIView.animate(withDuration: segmentAnimationDuration,
delay: 0,
options: [],
animations: {
[weak self] in
guard let self = self else { return }
bottomConstraint.constant = self.orgConstraintConstant ?? 0
self.view.layoutIfNeeded()
},
completion: {
(_) in
//animate tabbar fade in
UIView.animate(withDuration: segmentAnimationDuration) {
[weak self] in
guard let self = self else { return }
self.tabBar.alpha = self.orgTabBarAlpha ?? 0
self.view.layoutIfNeeded()
}
})
//reset our values
self.orgConstraintConstant = nil
}
//we should hide it
else {
//save our previous values
self.orgConstraintConstant = bottomConstraint.constant
self.orgTabBarAlpha = tabBar.alpha
//animate fade bar out
UIView.animate(withDuration: segmentAnimationDuration,
delay: 0,
options: [],
animations: {
[weak self] in
guard let self = self else { return }
self.tabBar.alpha = 0.0
self.view.layoutIfNeeded()
},
completion: {
(_) in
//then animate moving down
UIView.animate(withDuration: segmentAnimationDuration) {
[weak self] in
guard let self = self else { return }
bottomConstraint.constant = bottomConstraint.constant - self.tabBar.frame.height + 4 // + 4 looks nicer on no-home button devices
//self.tabBar.alpha = 0.0
self.view.layoutIfNeeded()
}
})
}
}
func tabBarIsVisible() ->Bool {
return orgConstraintConstant == nil
}
}
This is how it looks in my app (you can compare to my 1ste answer, the animation is a bit different but looks great) :
You can have a bug when animating manually the tab bar on iOS13 and Xcode 11. If the user press the home button after the animation (it'll just ignore the animation and will be there in the right place). I think it's a good idea to invert the animation before that by listening to the applicationWillResignActive event.
This wrks for me:
[self.tabBar setHidden:YES];
where self is the view controller, tabBar is the id for the tabBar.