How to change navigation controller's height without adding a toolbar ?
Here is an example of apple's iBooks app that I want to build.
I've a solution but isn't perfect( adding a toolbar below the nav controller but it is very ugly)
I think this is what you want,
screenshot
You can not change navbar height,but you can put a view under it,and use autolayout and shadow to make it looks like part of navbar.Set it to the class you made
Write a view to act as the extendbar
class ExtendNavView:UIView{
override func willMoveToWindow(newWindow: UIWindow?) {
let scale = UIScreen.mainScreen().scale
self.layer.shadowOffset = CGSizeMake(0, 1.0/scale)
self.layer.shadowRadius = 0;
self.layer.shadowColor = UIColor.blackColor().CGColor
self.layer.shadowOpacity = 0.25
}
}
Drag a UIView and put it under the navBar,then set autolayout to make it always under the nav
Change the navBar property in your viewController
class ViewController: UIViewController {
override func viewDidLoad() {
self.navigationController?.navigationBar.translucent = false
self.navigationController?.navigationBar.shadowImage = UIImage(named: "TransparentPixel")
self.navigationController?.navigationBar.setBackgroundImage(UIImage(named:"Pixel"), forBarMetrics:UIBarMetrics.Default)
}
}
The two image used here(Note:they are Translucent)
Pixel
url= "http://i.stack.imgur.com/gFwyN.png"
TransparentPixel
url = "http://i.stack.imgur.com/zpQw4.png "
You can also look at the Apple example project,you can also find the two images there
https://developer.apple.com/library/ios/samplecode/NavBar/Introduction/Intro.html
Related
After seeking a lot and trying many solutions, nope fixed my problem.
In my app I customized the UINavigationController in order to have blur effect:
import UIKit
class CustomNavigationController: UINavigationController {
override func viewDidLoad() {
super.viewDidLoad()
let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .regular))
visualEffectView.frame = (self.navigationBar.bounds.insetBy(dx: 0, dy: -40).offsetBy(dx: 0, dy: -40))
self.navigationBar.isTranslucent = true
self.navigationBar.setBackgroundImage(UIImage(), for: .default)
self.navigationBar.addSubview(visualEffectView)
self.navigationBar.sendSubviewToBack(visualEffectView)
}
}
Then in Main.storyboard I selected the customized class for the navigation controller item.
The blur effect works properly, the status icons are correctly visible, but not the standard navigation bar items: left button, title and right button.
For a moment they appears but soon after the customized navigation bar covers them.
I'm using Xcode 12.4 and I'm running the app on iPhone Xr.
How can I show the navigation bar elements again?
Thanks a lot in advance.
Translucent navigation bars in iOS already blur the content behind the bar, so you shouldn't need to add a UIVisualEffectView nor set a backgroundImage.
If you modify your code to just:
override func viewDidLoad()
{
super.viewDidLoad()
self.navigationBar.isTranslucent = true
}
does this not achieve the visual effect you're looking for?
If not, please try the following adjustment to your methodology:
override func viewDidLoad()
{
super.viewDidLoad()
self.navigationBar.isTranslucent = true
// create a UIImageView
let backgroundImage: UIImageView = UIImageView()
backgroundImage.autoresizingMask = [.flexibleWidth, .flexibleHeight]
backgroundImage.image = UIImage()
// add a blur effect to the ImageView
let visualEffectView: UIVisualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: .regular))
visualEffectView.frame = (self.navigationBar.bounds.insetBy(dx: 0, dy: -40).offsetBy(dx: 0, dy: -40))
backgroundImage.addSubview (visualEffectView)
// and set that as your backgroundImage on the navigationBar
self.navigationBar.setBackgroundImage(backgroundImage.image, for: .default)
}
this adds the blur effect to the backgroundImage. This seems to work for me, but the visual effect is no different than just using my first suggestion, likely because backgroundImage.image == nil.
This is certainly an improved approach in that it doesn't add unexpected subviews into the UINavigationBar view hierarchy, and I observed both methods did not affect the visibility of the bar controls.
I have modaly presented view controller in iOS >=13. Root view has clear background:
view.backgroundColor = .clear
Child view with white background has some top offset like this:
All is ok, but when I try to dismiss it by swipe down I see slightly visible shadow of presented view controller:
Is it posible to remove this shadow on modal presentation?
UPDATE: Upon further investigation, this does not appear to be something that can be changed. It's a private UIKit View setup by iOS and is a new addition in iOS 13. See 19:50 at https://developer.apple.com/videos/play/wwdc2019/224/
For my own apps/games I'll be looking to create a custom UIModalPresentationStyle to achieve the look I want.
You can also alleviate from this by simply presenting as .fullScreen or another presentation style instead of this new sheet method.
I have been trying to find the answer to this myself. So far I have only found that by setting the layer.shadowColor to clear it fixes this but only on iPhone. I cannot find how to fix this on iPad.
override func viewDidLoad() {
view.layer.shadowColor = UIColor.clear.cgColor
}
I have solution for you
extension UIViewController {
func removeBackgroundForParents() {
var superview = view.superview
while superview != nil {
superview?.layer.backgroundColor = UIColor.clear.cgColor
superview?.layer.shadowColor = UIColor.clear.cgColor
superview = superview?.superview
}
}
}
And use it in your view controller.
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
removeBackgroundForParents()
}
I'm adding a custom titleView inside a navigation bar using navigationItem.titleView for both Master/Detail VC. On changing the orientation of the device to landscape, titleView under MasterViewController works fine, but for DetailViewController titleView disappears. On changing the orientation back to portrait titleView appears back for DetailViewController. I have also attached a link for source code and video.
Is this an intended behavior or am I making a mistake from my side or is it an issue from Apple's side ?
//Custom Title View:
class TitleView: UIView {
override func sizeThatFits(_ size: CGSize) -> CGSize {
return CGSize(width: 50, height: 20)
}
}
class DetailViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
//Adding titleView for Master/Detail VC:
navigationItem.titleView = {
//Setting frame size here, did not make any difference
let view = TitleView(frame: .zero)
view.backgroundColor = .red
return view
}()
}
}
Full source code here: https://github.com/avitron01/SplitViewControllerIssue/tree/master/MathMonsters
Video highlighting the issue:
https://vimeo.com/336288580
I had the same issue. It seems an iOS bug. My workaround was to reassign the title view on every view layout. I used this piece of code in my DetailViewController:
override func viewWillLayoutSubviews() {
super.viewWillLayoutSubviews()
if let v = navigationItem.titleView {
navigationItem.titleView = nil
navigationItem.titleView = v
}
}
For those who stumble upon this, see also iOS 11 navigationItem.titleView Width Not Set. Basically, there's two suggested workarounds:
use a custom UIView that tells iOS to treat its intrinsicContentSize to be as big as possible with UIView.layoutFittingExpandedSize
use widthAnchor/heightAnchor constraints to set width and height of your view
I am trying to make a blurred background the UITabBar for my UITabViewController, and the idea is to have it be blurred and transparent so that the views underneath can be seen scrolling by.
Unfortunately I cannot for the life of me get the tab bar to be transparent. No matter what I do, there is always some black background to the tab bar that prevents the underlying view controllers from showing through.
If I change the alpha of the UITabBar to something low I can see that the tableview is indeed behind it, however you can see that the UITabBar has some sort of background to it that is preventing the tableview from fully showing through (and I don't want to bar button items to be invisible, just the tab bar background).
How can this be?
In the custom tab bar's view did load I have:
self.tabBar.translucent = true
self.tabBar.alpha = 0.3
self.tabBar.backgroundColor = UIColor.clearColor().colorWithAlphaComponent(0.0)
self.tabBar.layer.backgroundColor = UIColor.clearColor().colorWithAlphaComponent(0.0).CGColor
self.tabBar.backgroundImage = nil
self.tabBar.shadowImage = nil
and in the AppDelegate I have:
UITabBar.appearance().barTintColor = UIColor.clearColor()
UITabBar.appearance().tintColor = kColorAccent
UITabBar.appearance().translucent = true
UITabBar.appearance().translucent = true
UITabBar.appearance().backgroundColor = UIColor.clearColor()
UITabBar.appearance().backgroundImage = nil
UITabBar.appearance().layer.backgroundColor = UIColor.clearColor().CGColor
UITabBar.appearance().shadowImage = nil
...yeah It's excessive but I want to try everything.
Any ideas on what to do?
Make a UITabBar transparent
Assign a clear image to its backgroundImage. You can use a 1x1 clear.png, or create one programmatically:
self.backgroundImage = UIImage.imageWithColor(UIColor.clearColor())
This will make the UITabBar transparent:
Add a blur effect
Insert a UIVisualEffectView as the rearmost subview.
let frost = UIVisualEffectView(effect: UIBlurEffect(style: .Light))
frost.frame = self.bounds
self.insertSubview(frost, atIndex: 0)
This will insert a UIBlurEffect (frost):
Example
Set the Custom Class for the UITabBar of the Tab Bar Controller to FrostyTabBar.
You have a few options to supply a clearColor image. You can create a clear.png image with an alpha of 0. A programmatic elegant solution is described here.
If using a clear.png, assign it to the Background Image in the Attribute Inspector:
In Interface Builder, pick Style: Default & Translucent.
Once you take control of the background blur with a UIVisualEffectView, you can in turn supply any UIVisualEffect you so desire.
The entire FrostyTabBar class looks like this:
import UIKit
class FrostyTabBar: UITabBar {
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
let frost = UIVisualEffectView(effect: UIBlurEffect(style: .light))
frost.frame = bounds
frost.autoresizingMask = .flexibleWidth
insertSubview(frost, at: 0)
}
}
► Find this solution on GitHub and additional details including a 1x1 clear.png on Swift Recipes.
I found a prefect solution, you only need to subclass UITabBar and then do the following actions to clean that annoying views
class MainTabBar: UITabBar {
var cleanDone = false
override func layoutSubviews() {
super.layoutSubviews()
self.deleteUnusedViews()
}
func deleteUnusedViews() {
if !self.cleanDone {
var removeCount = 0
for (_, eachView) in (self.subviews.enumerate()) {
if NSStringFromClass(eachView.classForCoder).rangeOfString("_UITabBarBackgroundView") != nil {
eachView.removeFromSuperview()
removeCount += 1
}
if NSStringFromClass(eachView.classForCoder).rangeOfString("UIImageView") != nil {
eachView.removeFromSuperview()
removeCount += 1
}
if removeCount == 2 {
self.cleanDone = true
break
}
}
}
}
}
the only solution that worked for me was this:
UITabBar.appearance().shadowImage = UIImage()
UITabBar.appearance().backgroundImage = UIImage()
and set: (you can do this in storyboard as well)
UITabBar.appearance().barTintColor = UIColor.clear
but what i have to set in storyboard is:
tabbar : translucent -> true
I am updating my app to use iOS 7 and I'm having a problem with a table view. My tab bar is translucent. The problem is when I scroll to the bottom of my table view, part of the last cell is still behind the tab bar. I'd like to have a bit of space between the last cell and the tab bar. I could fix this by using an opaque tab bar instead, but I want to keep it translucent.
Try setting
self.edgesForExtendedLayout = UIRectEdgeNone;
self.extendedLayoutIncludesOpaqueBars = NO;
self.automaticallyAdjustsScrollViewInsets = NO;
Inside the tableview controller
Swift 4.x
let adjustForTabbarInsets: UIEdgeInsets = UIEdgeInsetsMake(0, 0, self.tabBarController!.tabBar.frame.height, 0)
self.yourTableView.contentInset = adjustForTabbarInsets
self.yourTableView.scrollIndicatorInsets = adjustForTabbarInsets
Check the screen shot
Check the under top Bar and Un-checke under Bottom Bar
SWIFT 3
put this inside viewDidLoad of your tableViewController:
self.edgesForExtendedLayout = UIRectEdge()
self.extendedLayoutIncludesOpaqueBars = false
self.automaticallyAdjustsScrollViewInsets = false
Swift 3.0
This is what worked for me. In your Custom ViewController:
override func viewDidLoad() {
super.viewDidLoad()
let adjustForTabbarInsets: UIEdgeInsets = UIEdgeInsetsMake(self.tabBarController!.tabBar.frame.height, 0, 0, 0);
//Where tableview is the IBOutlet for your storyboard tableview.
self.tableView.contentInset = adjustForTabbarInsets;
self.tableView.scrollIndicatorInsets = adjustForTabbarInsets;
}
Not to sure I like the solution but it works for me.
With iOS 11 I have no issue, I simply use the following in viewDidLoad():
self.collectionView.bottomAnchor.constraint(self.view.safeAreaLayoutGuide.bottomAnchor).isActive = true
However on iOS 10 I need to hack my way like this:
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let tabBarHeight: CGFloat = (self.parent?.tabBarController?.tabBar.frame.size.height)!
if #available(iOS 11.0, *) {
} else {
self.collectionView.bottomAnchor.constraint(equalTo: self.view.bottomAnchor, constant: -tabBarHeight).isActive = true
}
}
This is working for me
override func viewDidLoad() {
self.edgesForExtendedLayout = UIRectEdge()
self.extendedLayoutIncludesOpaqueBars = false
}
If any view shows behind a UITabBar you can grab the bottomLayoutGuide and make adjustments at runtime. What I do is have a BaseViewController that all my view controllers inherit from. Then if the tab bar is visible we adjust the view like so:
import UIKit
class BaseVC: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidLayoutSubviews() {
//Ensures that views are not underneath the tab bar
if tabBarController?.tabBar.hidden == false {
var viewBounds = self.view.bounds;
var bottomBarOffset = self.bottomLayoutGuide.length;
self.view.frame = CGRectMake(0, 0, viewBounds.width, viewBounds.height - bottomBarOffset)
}
}
}
Since I don't use storyboards (where you can click a checkbox in IB to fix this problem), this has been the best solution I have found.
It is really hard to resolve the issue without detail information or actual codes. I have similar issue of tabview behind UItabBar in my project. The solutions offered here do not work in my case. After exploring my codes, I found a solution for my case.
Here is brief explanation of my case. I have a UItabBar in main view with two tab buttons. In one tab view, there is table view. If user taps on a row, a detail view is presented by using navigation controller. In the detail view, the tab bar is hidden, and a toolbar is showing at the bottom.
In order to bring tab bar back and hide the toolbar when the main view is brought back, I have to explicitly show tab bar and hide toolbar in the event of viewWillAppear:
class myMainViewController: UITableViewController {
private var tabBarHidden: Bool? = {
didSet {
self.tabBarController?.tabBar.isHidden = tabBarIsHidden ?? true
}
}
private var toolBarIsHidden: Bool? {
didSet {
let hidden = toolBarIsHidden ?? true
self.navigationController?.toolbar.isHidden = hidden
self.navigationController?.setToolbarHidden(hidden, animated: true)
}
}
...
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.tabBarIsHidden = false
self.toolBarIsHidden = true
}
...
}
I finally realize that the visibility of bar at the bottom is set in the event of viewWillAppear. At that time, the tableView or scroll view's content insets are set already based on no bar at the bottom. That's why my tableView is behind the bottom bar.
The solution I found is to reset content insets in the event of viewDidAppear:
override func viewDidAppear(_ animated: Bool) {
// In the event of viewWillAppear, visibilities of tool bar and tab bar are set or changed,
// The following codes resets scroll view's content insets for tableview
let topInset = self.navigationController!.navigationBar.frame.origin.y +
self.navigationController!.navigationBar.frame.height
let adjustForTabbarInsets: UIEdgeInsets = UIEdgeInsetsMake(
topInset, 0,
self.tabBarController!.tabBar.frame.height, 0)
self.tableView.contentInset = adjustForTabbarInsets
self.tableView.scrollIndicatorInsets = adjustForTabbarInsets
}
The best approch would be to Embed TabBarController to your ViewController (Editor -> Embed In -> TabBar Controller)and set the bottom of the tableview to be bottom of safe area of viewcontroller. The other ways wont be as perfect as this one.
You need to adjust the height of the table view. Just leave 49px at the bottom, as the tabbar height is 49 px. Adjust the height of table view so that it leaves 49px space below it.