Currently on my viewController : Upload, my button send the data to my database only if all the information are filled out, and I come back to the preview view (table View) with :
self.navigationController?.popViewControllerAnimated(true)
I would like, if it is possible, to come back to my main view on the tabBarController. I tried many things, like directly on the storyboard with Present modally segue to "TabBar controller", but I come back to the TabBar without sending my data to the database and without checking in the information are filled out..
How can I do it?
Thanks!
UITabBarController has a property selectedIndex with which you can switch the selected tab. So on completion after dismissing the UploadViewController you can run:
self.tabBarController?.selectedIndex = 0 // Index to select
It would probably be best to create a delegate for your UploadViewController to fire a function to do all the work in your previewVC on API call completion.
(Super late response...in case someone has similar questions, presumably in later version of Swift, such as mine which is Swift 5, iOS 13.2). Steps:
Be sure to set an id for your UITabBarController storyboard, e.g. "TabBarViewController"
Next, add the following to an action that has already been connected to a button:
let ID_TABBAR = "TabBarViewCOntroller"
#IBAction func returnToTabbar(_ sender: Any) {
let tabBarController = self.storyboard?.instantiateViewController(identifier:ID_TABBAR) as! UITabBarController
self.navigationController?.pushViewController(tabBarController, animated:true)
}
Referenced from one of the responses from this post.
Update: In case your Tab Bar View Controller also happens to be the root view controller, the two lines of the code in the returnToTabbar method above can be:
self.dismiss(animated:true, completion:nil);
self.navigationController?.popViewController(animated:true);
(ref.: See answer here, for Swift4 but works just fine in Swift5)
Related
I want my app to check at start conditionaly if a variable is correct or not. Based on that it should either go to an intro screen (where he can select a variable in my case select a team) or it should start the main view. After searching i found this code and edited it. But there still seems to be problems. First of all I dont have two identifier. The Intro has one but not the main view. My main View is called WeatherViewController and the Intro screen is called FirstScreenViewController. I also added a picture of my Main.storyboard.
I also googled a lot about conditional UINavigationController but I can only understand with a video and did not found a video about it.
I tried to use the code from here.
var id = hello ? "goToIntro" : "???"
self.window = UIWindow(frame: UIScreen.main.bounds)
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let WeatherViewController: UIViewController = mainStoryboard.FirstScreenViewController(withIdentifier: WVC has no identifier??) as UIViewController
self.window?.rootViewController = WeatherViewController
self.window?.makeKeyAndVisible()
if hello {
self.performSegue(withIdentifier: "goToIntro", sender: self)
} else {
/here nothing should happen. It should open the Main View
self.performSegue(withIdentifier: "???", sender: self)
}
Note: This answer was referring to the original question (before any edits) that was attempting a segue inside loadView().
You're supposed to manually create your controller's view in loadView. You're currently doing nothing, hence the black screen. Furthermore, if you are using a Storyboard or a xib for managing this controller you shouldn't be overriding loadView at all.
Having said that it might be a better idea to move this branching logic a step back, to "something" (a container controller like a UINavigationController or a custom one, or even directly setting the root controller of your window if it makes sense) that will present (or set) A or B based on some condition and thus avoid to load this controller altogether (have in mind that in your code, the controller is initialized, it will be part of the hierarchy and all the lifecycle methods will be called even if you segued directly to another one)
Finally, if you decide for some reason to override loadView you don't have to call viewDidLoad yourself, the system will call this method.
I am writing a macOS application with multiple view controllers, using Storyboards.
In my main View Controller I would like to be able to copy and paste data to the NSPasteboard. The data is related to buttons displayed to the user, and the exact data to be copied varies depending on which button has most recently been pressed/selected.
I would like to be able to override the standard behaviour of the Copy and Paste NSMenuItems when my main View Controller is the front most (key) window, but revert to back to standard behaviour when other windows are in the foreground, as they all contain NSTextFields which can be copied/pasted into.
I have done a lot of googling, and overriding this behaviour is not very well documented. I can achieve it globally by adding an IBAction into the App Delegate, which I could use to call a function in whichever View Controller is key, but this doesn't feel like a very elegant solution.
Currently my IBAction in the App Delegate looks like this:
#IBAction func copy(_ sender: Any) {
if let window = NSApplication.shared.keyWindow {
if let splitView = window.contentViewController as? SplitViewController {
if let controlVC = splitView.controlItem.viewController as? ControlViewController {
controlVC.copyAction(self)
}
}
}
}
Am I missing a neater solution?
Thanks,
Dan
i have the following situation:
In my TabBarController i have multiple tabs and it all works fine, but:
The destination of one specific tab is dynamic.
If a certain condition matches, this specific tab should open a NavigationViewController.
If an other condition matches, this specific tab should open a ViewController.
Are there any built in solutions?
How can i modify the destination of a tab at runtime?
Greetings and thanks
Long long ago, in a galaxy far far away...
Segues didn't even exist. So yeah
The UITabBarController has a setter in which you can pass the new view controllers you want it to handle. You won't be able to decide what shows at the point of the tapping this way, but you'll be able to change the controllers as the condition changes.
open func setViewControllers(_ viewControllers: [UIViewController]?, animated: Bool)
If you however DO need to decide as the tab is tapped... You could have your tab controller direct to a controller that's essentially empty, and use view controller containment for that controller to have the 2 options on it, and have one of them hidden. Pretty doable from the storyboard with very little supporting code. I think I prefer this option.
If you would rather continue to use Segues, then you can perform a specific Segue depending on the state of some condition variable like this:
func presentAppropriateView() {
if condition {
performSegue(withIdentifier: "ToNavBar", sender: self)
} else {
performSegue(withIdentifier: "ToVC", sender: self)
}
}
write a delegate method which you want to perform on certain condition on runtime and call
[self.tabBarController setSelectedIndex:0];
where index could be of your choice
I am trying to refresh my viewcontroller (reload it ) using UIApplication.shared.keyWindow?.rootViewController as shown below in code, it works however when reloaded the novaigation controller is not there, I mean there a back button that can go to previous view controller it does not appear when I did that - any help
#IBAction func Save(_ sender: AnyObject) {
UIApplication.shared.keyWindow?.rootViewController = storyboard!.instantiateViewController(withIdentifier: "UploadPhotoviewcontroller")
}
Default back button, appearance and work in current navigationController navigation stack. If you change rootViewController, this action will destroy you current navigation stack and all previous controllers. And you cant go back.
Change the rootViewController be bad practic. I think you have a problems with the architecture
#jon when I try to comment it did not and I can not reply to your question as comment - I do not know why
Exactly that is the reason
I found the answer:
To deselect the picked image in elcimagepickercontroller use below code:
imagePicker.popToRootViewController(animated: true)
self.dismiss(animated: true, completion: nil)
I am using segues to present a new view controller. I have a 1 button that goes to VC 2. I am using this code:
func jumpToVC() {
dispatch_async(dispatch_get_main_queue()) {
[unowned self] in
self.performSegueWithIdentifier("whatVC", sender: self)
}
}
However the VC will not remove itself from the memory. How can I achieve this? I am presenting my views modally.
I think that you got a little bit lost here. What you want is a segue that will cause you to change UIViewController object to another one. You don't need to delete the first UIViewController and it's against practice in Swift.
From what I guess, you're just starting your journey with Swift and I know how confusing it might be. Therefore, I recommend you try this tutorial: https://itunes.apple.com/us/course/developing-ios-9-apps-swift/id1104579961
I've recently learnt from that and it's the best thing I've found.
Let me know if you have any more questions and whether I can help you somehow.