I'm trying to understand how to change the height of a navigation bar. Whenever I insert one into my app, it is shorter than all the navigation bars used in Apple's stock apps (Messages and Settings for example). I would like it to get to that height because when I try to add a bar button, it conflicts with the status bar. I also read that as a developer you shouldn't change the height of the navigation bar so I'm a bit confused. Finally, I looked at this Stack Overflow page: How can I change height of Navigation Bar Swift 3.
I tried to implement the code...
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let height: CGFloat = 50 //whatever height you want
let bounds = self.navigationController!.navigationBar.bounds
self.navigationController?.navigationBar.frame = CGRect(x: 0, y: 0, width: bounds.width, height: bounds.height + height)
}
...but my app crashed when I did so.
I'm using Xcode 8.2 beta with Swift 3.
I dont think you can change size of navigationBar.
But this is how would i recommend you to do it.
Remove default navigation bar.
Create a view which is similar to a navigation bar like you design add constrains> leading,trailing,top and height for that
view. so basicly pin it to top, left and right with your design's
height.
Add 2 buttons left and right if needed which would look similar to navigation bar. add button constrains> leading, top, bottom and
width for left one and trailing,top, bottom and width right one.
Add a UILabel which would be your navigation bar title., add label constrains leading with left button, trailing with right button, top
and bottom with navigation view you created. Make uilabel text
centered.
Here you go u have your custom navigation bar.
On each controller all u have to do is CMD+C and CMD+V on the other controller add leading,trailing and top constrains.
Hope it helped.
It is possible, and simple, to add an independent navigation bar and have it match the normal navigation bar height and rotation functionality. Here is how to do it (link includes a video):
In Interface Builder:
Add a UINavigationBar to your view, positioned at the Top Layout Guide location.
Set constraints for Leading Space to Container Margin, Trailing Space to Container Margin, and Top Space to Container — all with ‘Relative to margin’ deselected and a Constant value of 0 (zero).
With the Navigation Bar selected, in the Identity Inspector, add a key path called barPosition. Give it a Number type, and a value of 3.
That should be all you need. However, if you’ve completed these steps and your project doesn’t seem to like the key path, then continue as follows:
Remove the barPosition key path from the Navigation Bar’s Identity Inspector.
Add an IBOutlet for the Navigation Bar to your view controller.
Set your view controller to be a UINavigationBarDelegate.
Add the delegate method func position(for bar: UIBarPositioning) -> UIBarPosition to your view controller, and return a value of UIBarPosition.topAttached.
Related
I have a Navigation Controller and a Collection View under it inside my app. And there is a problem: I use large title inside my Navigation bar, so everything inside is not static. When I scroll the collection view cells, the title (I created it manually using UILabel() to move it as I want inside the navigation bar) and buttons move up and the navigation bar takes form of iOS 10 navigation bar, I mean its height. You can see it here:
The normal state of my Navigation Bar with "Prefer large titles" On:
It happens when I scroll my Collection View, everything goes up:
So the question is simple: how to make the force constant height for the navigation bar? I want it to become fixed even while scrolling. Are there any ideas? Is it possible?
And the second question, if the first is impossible: Another solution for my problem is to make the Navigation Bar with "Prefer large titles" Off bigger. I tried this code:
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let height: CGFloat = 50 //whatever height you want to add to the existing height
let bounds = self.navigationController!.navigationBar.bounds
self.navigationController?.navigationBar.frame = CGRect(x: 0, y: 0, width: bounds.width, height: bounds.height + height)
}
but it worked only for large titles. So how can I make the navigation bar bigger?
Yes, you can make it fixed. It will not scroll if the very first view in the view hierarchy is not a CollectionView/TableView (ScrollView).
Using Storyboard/Xib:
Consider the following image where a tableView and button are added in scene. Here the navigation bar will collapse on scroll of tableView because tableView is the very first view in viewController's containerView hierarchy attached to the navigation bar.
Now to make the navigation bar fixed, if we just change the order of tableView and button as below, it will disable the collapsing of navigation bar.
To change the order of the view, you have to click, hold and move up/down.
If you have only CollectionView in this scene then you can add a placeholder view at the top and set its height to zero as below,
Programmatically:
If you are setting up view's programmatically then you just need to add a placeholder view at the top or add tableView/collection after adding other views.
e.g,
self.view.addSubview(UIView(frame: .zero))
self.view.addSubview(tableView) // or collectionView
I want to have the Tab Bar at the top of the screen. One post suggested to do the followings (I put the following code in the viewDidLoad() of the UITabBarController) :
CODE
let tabBar = self.tabBar
// yStatusBar indicates the height of the status bar
let yStatusBar = UIApplication.sharedApplication().statusBarFrame.size.height
// Set the size and the position in the screen of the tab bar
tabBar.frame = CGRectMake(0, yStatusBar, tabBar.frame.size.width, tabBar.frame.size.height)
There are 2 problems with this solution:
The bottom of the screen is left with a black region where the tab bar was
The Tab bar covers the view at the top of the screen - the constraints of that view is relative to the device but they should be relative to the Tab bar. However when the screen is designed in the IB there is no Tab bar to relate to.
Is there a way to overcome these problems? P.S. I am new to IOS
let tabBar = self.tabBarController?.tabBar
// Set the size and the position in the screen of the tab bar
tabBar?.frame = CGRect(x: 0, y: self.view.frame.height, width: (tabBar?.frame.size.width)!, height: (tabBar?.frame.size.height)!)
Although it is against the human interface guidelines there exist a hack if you really want to.
You could create a blank UIView in your storyboard (with proper constraints set up) that would essentially be the placeholder for the tabBar when loaded.
You then set top constraints for your other views relative to this view that you have setup.
This works, but probably not best practice to do so
I would like to add a main button to a UITabBar as shown in the image:
main button, the button i wish to add
meaning i would like to add a button in the center of the bar, the button will be a bit higher then the other buttons( the regular buttons of an UITabBar)
If you're using Interface Builder:
Drag a UIButton to the view
Set the size constraints (ex: width 80, height 80)
Align Center X to Superview
Align Bottom to Tab Bar: -20
In your View Controller:
Add an IBOutlet for the button
Then in viewDidLoad under super.ViewDidLoad() add:
button.layer.zposition = 1
It should give you this result:
You can lower the image by increasing the negative number on the bottom constraint.
I started building a TableView in my app by using a TableViewController in a storyboard. When you do this, you have a very cool effect when you scroll down your list : the cells moving behind the nav bar get blurred.
Some time later, I had to move from this TableViewController to a ViewController with a TableView inside (I had to add other views at the bottom of the table).
In order to avoid having the first cells hidden by the navigation bar (being over it), I added constraints to the Top and Bottom Layout Guides, and to the left and right edges of the view.
This works fine, but I lost the cool blurred scrolling effect : the cells seem to be disappearing before going behind the navigation bar.
I've seen workarounds with people not using constraints and putting magic numbers in interface builder. I cannot do this, first because I dislike it, and second because I have to be iOS 6 compatible.
What did I miss to be able to benefit again from the blurred navigation bar effect ?
You have to manually adjust the contentInset of the table view and make sure the table view frame origin is 0, 0.
In this way the table view will be below the navigation bar, but there will be some margin between the content and the scroll view edges (the content gets shifted down).
I advise you to use the topLayoutGuide property of the view controller to set the right contentInsets, instead of hard coding 64 (status bar + navigation bar).
There's also bottomLayoutGuide, which you should use in case of UITapBars.
Here is some sample code (viewDidLoad should be fine):
// Set edge insets
CGFloat topLayoutGuide = self.topLayoutGuide.length;
tableView.contentInset = UIEdgeInsetsMake(topLayoutGuide, 0, 0, 0);
By the way, this properties of UIViewController might help you (you should not need to change their default values, but I don't know what your view hierarchy is):
automaticallyAdjustsScrollViewInsets
edgesForExtendedLayout
extendedLayoutIncludesOpaqueBars
The tableView needs to be full screen. That is underneath the top and bottom bars. Note don't use the top and bottom layout guides as they are used for positioning relative to the bars not underneath.
Then you need to manually set the content inset of the tableview. This sets the initial scroll position to under the top bar.
Something like:
CGSize statusBarSize = [[UIApplication sharedApplication] statusBarFrame].size;
CGFloat h=MIN(statusBarSize.width, statusBarSize.height);
UIEdgeInsets e = UIEdgeInsetsMake(self.navigationController.navigationBar.bounds.size.height + h,
0.0f,
0.0f,
0.0f);
self.tableView.contentInset = e;
Not you get this functionality for free when using a tableView controller and the "Automatically Adjust content inset" settings
You probably have the coordinates of your tableView not set to (0, 0) to map to those of the viewController.view.frame or viewController.view.bounds. If you have done that, try setting
self.navigationController.navigationBar.translucent = YES;
UIViewController property edgesForExtendedLayout does the trick. If you are using storyboards just make sure Extended Edges Under Top Bars is on (and it is by default).
If you are creating your view controller programmatically try this:
- (void)viewDidLoad
{
[super viewDidLoad];
self.edgesForExtendedLayout = UIRectEdgeAll;
}
And of course, your table view needs to have proper autoresizing mask/layout constraints
edgesForExtendedLayout is not what you want here, as this will limit the table view underneath the navigation bar. In iOS 7, the view controllers uses fullscreen by default, and the property controlling where the tableview content starts is automaticallyAdjustsScrollViewInsets. This should be YES by default, so check if it is somehow set to NO, or try setting it explicitly.
Check this answer for a good explanation on how this works:
https://stackoverflow.com/a/19585104/1485715
I'm working on a project that needs to have the navigation bar height bigger than the default.
This is how i set the nav bar height:
- (CGSize)sizeThatFits:(CGSize)size {
if (iPad) {
CGSize newSize = CGSizeMake(768,86);
return newSize;
}
return CGSizeMake(320, 44);}
I set an bg image for the navigation bar and that's working ok.
The problem is that the back button and the right button item are not centered.
Does anyone know how to center them?
Thanks
It's generally bad practice to manipulate the navigation bar's height. I tried to do it a number of different ways for one project and every approach had a "gotcha". Namely, the navigation buttons are always justified to the bottom of the navigation bar, so adjusting it's height will cause the buttons to look like they're rendering towards the bottom of the bar. And the buttons will animate oddly as you push and pop other controllers. I would suggest not adjusting the height of the navigation bar.