I have a custom TabBarControllerand on one of the Tab Bar Items I have a round red counter. The first Tab Tab Item presents a summary View Controller. The second Tab Bar Item presents a menu embedded in a Navigation Controller The Tab Bar Counterworks fine across the board, except when I segue back from the summary View Controller. Then the counter disappears. I have tried to load the counter in the customTabBarController:
import UIKit
class CustomTabBarController: UITabBarController {
override func viewDidAppear(_ animated: Bool) {
if tabBarCounter != 0
{
let vc = self.tabBarController?.viewControllers?.last
vc?.tabBarItem.badgeValue = "\(tabBarCounter)"
vc?.tabBarItem.badgeColor = UIColor.red
}
}
}
Screendump of storyboard. (The bottom ViewController is the one I´m having trouble with. Segue highlited)
Related
In my project you can create a post from a modal view.
When the modal view is dismissed (user presses on save post) I want to switch the tab bar controller to the second tab (post feed screen).
This topic is similar to my problem. The only difference being this is presented from a modal view. I can't figure out how to implement it in my code (tab bar is nil)
Switch tab bar programmatically in Swift
I have added 3 images to make this issue clearer
code screenshot
console message
#objc func saveAction(sender: UIButton) {
print ("> save pressed")
print(presentingViewController?.tabBarController)
print(presentingViewController)
presentingViewController?.tabBarController?.selectedIndex = 1
dismiss(animated: true)
}
edit: sorry stack overflow doesn't allow me to add images yet
You can do this using delegate pattern. But if you prefer not to add a delegate for this, you can do as shown below;
You can switch the tabbar by changing the selectedIndex property of tabBarController
if let presenter = presentingViewController as? LibraryViewController {
presenter.tabBarController?.selectedIndex = 1
}
dismiss(animated: true)
If you are presenting the modal on navigation controller in tabbar, use:
if let tabBar = presentingViewController as? UITabBarController {
tabBar.selectedIndex = 1
}
dismiss(animated: true)
I have a tab bar with five items, and I am trying to add a functionality to scroll to the top when the user taps the tab bar item again. Added the UITabBarControllerDelegate to the views where I want to trigger the event and also created a function to determine the selected tab bar index.
When I open the app, index 0 is auto-selected and works perfectly. The view auto scrolls to the top when I scroll down and tap the tab bar index. The problem occurs when I go to index 1 and trigger the scroll there. It somehow completely removes the auto-scroll from my first tab bar item.
Selecting other tab bar items without the auto scroll does not affect index 0 at all.
Home (index 0)
func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
let tabBarIndex = tabBarController.selectedIndex
if tabBarIndex == 0 {
self.collectionView?.setContentOffset(CGPoint(x: 0, y: -10), animated: true)
}
}
Users (index 1)
func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
let tabBarIndex = tabBarController.selectedIndex
if tabBarIndex == 1 {
self.tableView?.setContentOffset(CGPoint(x: 0, y: 0), animated: true)
}
}
Anything with a delegate property can only have one delegate assigned to it at any given time. What ever set the delegate most recently will receive the next delegate method call.
In your case you can probably reset the tab controller's delegate to self in each view controller's viewDidAppear method since you want the currently visible view controller to be the current tab controller delegate.
Add the following to each view controller that needs to be the tab controller's delegate:
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
self.tabBarController?.delegate = self
}
Im currently designing an app that utilizes a tab bar controller.
On the messages tab (instant messages), I want the tab bar to disappear whenever a user is having/viewing his/her conversation with another person. To do so I used this:self.tabBarController?.tabBar.isHidden = true
It disables the tabBar, but now the issue is that whenever I hit the back button to return to previous views (embedded in a navigation controller), the tab bar is still hidden. On the other views, I've set tabBar.isHidden = false, but that doesn't seem to fix it and now I can't access any of the other tabs.
My question is: How can I hide the tabBar on one view but keep it visible when I return to previous views?
In TabBar firstViewController
override func viewWillAppear(animated: Bool) {
// Enable TabBar
self.tabBarController?.tabBar.hidden = false
}
In SecondViewController (Pushed from firstViewController)
override func viewDidLoad() {
super.viewDidLoad()
// Disable TabBar
self.tabBarController?.tabBar.hidden = true
}
I'm developing a swift app that has a Tab Bar Controller and one of the tabs has a Navigation Controller. The tab with a Navigation Controller has a Table View, and the cells in the Table View segue to a regular View Controller. The information appears in the destination view controller as desired, put when the destination view controller is presented, both the tab bar and the navigation bar disappear.
Here is my prepareForSegue:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "entryCellToEntryView" {
if let destination = segue.destinationViewController as? EntryDetailViewController {
if let index = customTableView.indexPathForSelectedRow {
if let cell = customTableView.cellForRowAtIndexPath(index) as? EntryTableViewCell {
destination.entryToDisplay = cell.entry
} else {
print("prepareForSeque: Unable to cast cell as EntryTableViewCell")
}
} else {
print("prepareForSeque: Index cannot be established")
}
} else {
print("prepareForSeque: Destination cannot be downcast to EntryDetailViewController")
}
}
}
Here is a link to a photo of my storyboard:
http://grantbroadwater.com/storyboard.png
The navigation bar and tab bar disappears, because you are using model segue.
Change segue to push are show.
In model segue destination ViewController appears on the top of current viewController.
So destination view controller does not have any idea about your navigation stack or tab bar.
If you use push segue, or show segue now a days, then only it will be pushed into navigation stack.
I have the following Storyboard Segue in my Swift project:
The animation is correct, but there is no navigation bar in the destination view controller. I want to force the destination view controller to have a navigation bar. I tried in the destination view controller:
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(true)
navigationController?.navigationBar.hidden = false
}
Or:
override func viewWillAppear(animated: Bool) {
self.navigationController?.setNavigationBarHidden(false, animated: true)
}
But it refuses to show any navigation bar.
How can I perform a vertical segue (like "Cover Vertical") but still display a translucent Navigation bar in the destination view controller?
Edit: My Attributes inspector for the destination view controller:
Try to create the Segue to a Navigation controller instead of your view controller. Navigation bars are only shown for view controllers in a navigation stack. In your case, the source view controller seems to be in a navigation stack but not the presented view controller. Try something like this: