I use the following code to add a navigation bar with buttons to my view:
let navBar = UINavigationBar(frame: CGRectMake(0, 20, screenWidth, 44))
var homeButton : UIBarButtonItem = UIBarButtonItem(title: "", style: UIBarButtonItemStyle.Bordered, target: controller, action: "closeView")
homeButton.image = UIImage(named: "back.png")
var item = UINavigationItem(title: title)
item.leftBarButtonItem = homeButton
if addPlus {
var addButton : UIBarButtonItem = UIBarButtonItem(title: "", style: UIBarButtonItemStyle.Bordered, target: controller, action: "addItem")
addButton.image = UIImage(named: "plus-25.png")
item.rightBarButtonItems = [addButton]
}
var items = [
item
]
navBar.setItems(items, animated: true)
controller.view.addSubview(navBar)
For some reason when any type of UIAlertView is displayed the buttons on the bar shift down.
Any ideas why this is happening?
In your storyboard, bring a navigation bar and make it to be auto-fitted in the screen, and don't try shifting it down.
Not the best solution, but since this behavior was only happening with my custom bar button items (and not the bar button items I made using interface builder) I just removed them with "self.navBarNavItem.setRightBarButtonItems([], animated: true)" before calling "presentViewController".
Then if the result of the alert (i.e. what the user selected) resulted in staying on the current view (instead of changing views) then I add them back in when that handler is executed.
This stopped the buttons from visibly showing in the wrong position and then put them back in the correct position when the alert completed.
Related
I am creating a project where I need to have a default back button and custom filter button on the left side of the navigation bar.
I have created custom back button, custom filter button and add both of them to leftBarButtonItems
navigationItem.leftBarButtonItems = alignedLeftBarButtonItems()
func alignedLeftBarButtonItems() -> [UIBarButtonItem] {
let filterButton = createLeftCustomBarButton()
// back button creation
let backButton = UIBarButtonItem(image: R.image.navBackArrow(), style: .plain, target: self, action: #selector(self.backButtonPressed(_:)))
backButton.tintColor = UIColor.white
let barButtonsItems = [
backButton,
UIBarButtonItem(customView: filterButton)
]
return barButtonsItems
}
Things are fine and working.
Concern:
Default, User can go to the previous VC by sliding from left to
right. This functionality is lost in making this. Is there a way I can
have both buttons with the sliding functionality.
You need to use UIBarButtonItem to use default left or right swipe functionality for back button:
let backButton = UIBarButtonItem(image: Image.backButton, style: UIBarButtonItemStyle.plain, target: self, action: #selector(actionBackButton))
self.navigationItem.leftBarButtonItem = backButton
With Custom button, you cannot get this functionality
My app requires me to add multiple buttons in my navigation bar.
Here is an image of what my nav bar looks like
How do i achieve this type of design?
You can configure your view controller's navigationItem in various ways to achieve this design.
Left side
To allow additional buttons next to the system "back button" on the left:
navigationItem.leftItemsSupplementBackButton = true
This allows you to add a left bar button item for the circular image:
navigationItem.setLeftBarButtonItem(imageItem, animated: trueOrFalse)
imageItem would be a UIBarButtonItem initialized with a customView or image, as discussed in some of the other answers here.
For the back button itself, to achieve a simple "<" without showing the title of the previous view or showing "< Back", you can open the storyboard and set the Back Button text of the previous view controller to a single space, as described in this post.
Title area
For the title area, as discussed in the other answers:
navigationItem.titleView = (a custom view)
Right side
For the right side, you can add multiple buttons:
navigationItem.setRightBarButtonItems([button1, button2, button3, button4], animated: trueOrFalse)
Here, button1, button2, button3, and button4 are each UIBarButtonItems. You would likely initialize these buttons with images.
Looks like you also will want to set the tintColor of the navigation bar to black, so that the bar buttons are rendered in black:
navigationController?.navigationBar.tintColor = .black
All of this code would be done in the view controller, usually in viewDidLoad, unless you need to dynamically change which buttons are shown as the content of your view controller changes.
Try this:
let callImage = UIImage(named: "call")!
let videoImage = UIImage(named: "video")!
let searchImage = UIImage(named: "search")!
let callButton = UIBarButtonItem(image: callImage, style: .plain, target: self, action: #selector(didTapCallButton))
let videoButton = UIBarButtonItem(image: searchImage, style: .plain, target: self, action: #selector(didTapVideoButton))
let searchButton = UIBarButtonItem(image: searchImage, style: .plain, target: self, action: #selector(didTapSearchButton))
navigationItem.rightBarButtonItems = [callButton, videoButton, searchButton]
Selector methods
func didTapCallButton(sender: AnyObject){
...
}
func didTapVideoButton(sender: AnyObject){
...
}
func didTapSearchButton(sender: AnyObject){
...
}
You can create your own view and put down your Images, Labels, etc...
After that, you write:
self.navigationItem.titleView = yourView
UINavigationItem has a property called rightBarButtonItems, this expects an array of UIBarButtonItem which would in your case be each of your buttons.
You can use the initialiser on UIBarButtonItem to specify the image and style:
init(image: UIImage?, style: UIBarButtonItemStyle, target: Any?, action: Selector?)
Initializes a new item using the specified image and other properties.
On your view controller you can access the navigation item through the accessor navigationItem, if you embed your view controller inside a UINavigationController you will need to access the navigationItem on that instance and not the view controller.
You can Add UIView in navigation bar so that you can add multiple buttons in that view.
I am having tableview EKEvents, if a user taps on an event i will push EKEventViewController.
EKEventViewController comes default with delete button in toolbar how can I hide this.
I tried making a custom viewController subclass of EKEventViewController and in viewWillAppear i was hiding the navigationController's toolbar it was working but not properly.Another problem with this it will allows me to navigate to event details which is not required.
let eventViewControler = EKEventViewController()
eventViewController.event = self.events[indexPath.row]
eventViewController.allowsEditing = false
self.navigationController.pushViewController(eventViewControler)
How can I hide the only delete button.
You can customize rightBarButtonItem.
let rightButton : UIBarButtonItem = UIBarButtonItem(title: "", style: UIBarButtonItemStyle.Plain, target: self, action: "")
self.navigationItem.rightBarButtonItem = rightButton
I'm implementing a photo gallery via a UIPageViewController subclass (called GalleryController) embedded in a UINavigationController. The navigation bar hides when I tap, but the animation is odd:
https://www.youtube.com/watch?v=9SLF3Nq3uNE
Here's the code in GalleryController:
override var navigationItem: UINavigationItem {
let item = super.navigationItem
// Access super and add items to it.
// Don't create a new UINavigationItem instance — that breaks the back button.
let space = UIBarButtonItem(barButtonSystemItem: .fixedSpace, target: nil, action: nil)
space.width = touchSize / 2
item.rightBarButtonItems = [
UIBarButtonItem(title: "All Photos", style: .plain, target: self, action: #selector(showAllPhotos)),
space,
UIBarButtonItem(title: "Delete", style: .plain, target: self, action: #selector(deletePhoto))
]
return item
}
This problem started occuring only after the page view controller was introduced.
What's causing this, and how do I fix it?
The solution turned out to be to do the following in the init of the UIPageViewController subclass:
automaticallyAdjustsScrollViewInsets = false
I don't know why it works, but it does.
I was earlier doing this in the child view controller (that represents a single page of the page view controller), but that wasn't working.
I want to hide the text of the back button on the navigation bar and so have found past questions such as this: UINavigationBar Hide back Button Text
However I can't change the text at all, either via using the storyboard, or in code.
See screenshot below for attempt at changing it using the storyboard:
Or if I try to do it programatically by adding the following to viewDidLoad of the pushed view controller
self.navigationItem.backBarButtonItem?.title = "stuff"
It has no effect, nor does moving the same line of code to the view controller doing the pushing.
How come it won't change at all regardless of how I'm trying to change it?
How come using the storyboard, the navigation item title can be set, but not the back button text?
If I add the following to the pushed view controller then I can get the text to change:
UIBarButtonItem.appearance().setTitleTextAttributes([NSForegroundColorAttributeName:UIColor.clearColor()], forState: UIControlState.Normal)
UIBarButtonItem.appearance().setTitleTextAttributes([NSForegroundColorAttributeName:UIColor.clearColor()], forState: UIControlState.Highlighted)
But I would like to understand why none of the other ways of trying to change it have any effect
The title of the back button gets automatically set to the title of the view controller that it will go back to.
To do what you want, you'll have to hide the back button and insert your own button with your own image.
Annoying == #YES.
As Brett mentioned above, a new bar button must be created to change the text.
To set the title of the back button, try the following code:
self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:#"Stuff" style:UIBarButtonStylePlain target:nil action:nil];
Or make it in storyboard by adding a bar button item to your navigation bar.
When it comes to segue from tabBarController to a normal navigation controller, it is always easy to get confused in implementing backBarItem.
The trick is about which controller the backBarItem belongs to. If we navigate from controller A to controller B, then the backBarItem, which is the back button appearing on the controller B's navigation bar, actually belongs to controller A. So we just need to find the right controller to edit the backBarItem.
Solution 1. In the controller A, set the backBarButton self.tabBarController?.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .done, target: self, action: nil)
//M: In controller A
override func viewDidLoad() {
super.viewDidLoad()
self.tabBarController?.navigationItem.backBarButtonItem = UIBarButtonItem(title: "", style: .done, target: self, action: nil)
}
Solution 2. We can use a customised leftBarButton in controller B to cover controller A's backButton. navigationItem.leftBarButtonItem = UIBarButtonItem(title: "<", style: .done, target: self, action: #selector(tapBackButton)), then set the action of the leftBarButton to go back to the previous controller.
//M: in Controller B
override func viewDidLoad() {
super.viewDidLoad()
//M: Hide the default back button.
//M: backBarItem will be covered by the leftBarItem anyway, here is to add an extra handling.
navigationItem.hidesBackButton = true
//M: Customize a leftBarButton.
navigationItem.leftBarButtonItem = UIBarButtonItem(title: " < ", style: .done, target: self, action: #selector(tapBackButton))
//M: Customize the color and font size to the leftBarButton
navigationItem.leftBarButtonItem?.setTitleTextAttributes([NSAttributedString.Key.foregroundColor: UIColor.white, NSAttributedString.Key.font : UIFont.boldSystemFont(ofSize: 25)], for: .normal)
}
//M: Set the action of the leftBarButton to go back.
#objc func tapBackButton(_ sender:Any){
self.navigationController?.popToRootViewController(animated: true)
}