I have found multiple questions related to creating the prepareForSegue method and all that. What I am a bit lost on is how do I create a segue from say my first tab to the second.
Do I create it like I create a segue with a button. I tried starting the CTRL + Drag to the other view, but nothing seemed to highlight? I have a:
Tab Bar Controller -> Tide Detail View + Tide Table View
I cant seem to find any results on creating that segue ID via the Storyboard. Is the segue between the tabs built in due to the nature or a UITabBar
The trouble with trying to segue between tabs of a tab bar controller is that segues are expected to be to new view controllers not existing view controllers. There is no built-in way of using segues to switch tabs.
The standard way of switching tabs is to set self.tabBarController.selectedIndex.
Not happy with this option, I created JLTTabSegue as a custom segue to switches between tabs.
Either go the standard route and skip segues altogether, create a custom segue to do it, or try mine if you like.
Related
I'm using Storyboards for the first time. It's mostly going okay, but one situation is very unclear:
I'm using a Tab Bar Controller as my Initial View Controller. I have three tabs, and they're each an instance of the same view controller class, the only difference being that I want to pass in a different array to each instance, to display different data.
My thought was I could use prepareForSegue: in the UITabBarController instance to pass the proper array to each destination view controller…but maybe UITabBarController isn't using segues to display each view controller in a tab, because there's no way in IB to specify a Storyboard ID for the "segue" to the tab contents. (If I select the segue that connects the Tab Controller to the child Controller, IB just says "Not Applicable" in the customizer area.)
So my question is: how can I handle this situation in IB?
UITabBarController uses segues, but it is a special kind of segues. Select a UITabBarController in the IB, and open the Connections inspector in the Utilities area. You'll see that there are Presenting Segues in the bottom (those are handled by prepareForSegue) and Triggered Segues, which include viewControllers segues. Those are the segues to tabs inside a tab bar. They are not really segues, they are more like references.
In order to use one class for three different view controllers as tabs in IB, you should add three empty (or not) view controllers as tabs and specify their class using the Identity Inspector in the Utilities area. The class can be the same for all three.
I want to design a routing mechanism for management view controller transitions in objective-c.
Two view controllers, without reference to the other side of the pointer, the transition is completely controlled by the route.
How to achieve the route?
Thanks for your help.
I hope you think like this.
Route = Segue (In Xcode)
Take Two View controller
Make 1st Embed in Navigation controller (Which is must be initial View Controller)
Put One Button in 1st VC
Press Ctrl + Drag Mouse from button to 2nd VC (One popup will be show, then select Push)
Run Project
Press Button
Lol
You can use Storyboard's segues. Create view controllers and segues between them. You can use Push Segue or Model Segue. Push Segue will let you pop next view controller too, and you will have to embed your first view controller into navigation controller. For Model Segue, you can move from one view controller to another but to return to previous view controller, you will have to create another segue.
I think I find the approach to answer this question。 Here is the similar project.
I have an app which has 5 major user flows..each flow is a few screens linking to each other...so each flow warranties its own storyboard. Each storyboard starts with a custom view controller that is embedded in a navigation controller. So far so good.
Now all of this is "stitched" together via a UITabBarController. This is the most default UI design ever known to iOS.
But turns out I don't really know how to link from tabbarcontroller, which is in its own storyboard (that is set as the main one on code project) to any of the other storyboards.
This problem looks so! simple, so I think I am missing something utterly obvious, but I just can't figure out how to do it.
So how do I link from tab bar controller in storyboard 1 to the initial view controller in storyboard 2 when a tab is tapped?
You should do this in code. You can have the tab bar controller (tbc for short) and the controller in the first tab in the app's main storyboard, and in the app delegate, instantiate the other controllers using instantiateInitialViewController. Create a mutable array by copying the tbc's viewController array, add the other controllers you instantiated to it, and then set that array as the tbc's viewControllers array.
You have to add your viewcontroller programmatically in tabbar.
When I drag to the next view controller to add a segue the new view controller has no navigation bar with a back button. I thought that was the default when you add a segue to a new VC. I'm also not able to drag a navigation bar to the top of the table view controller. Am I doing something wrong? Thanks.
Maybe the problem is the kind of segue that you are you using. The Segue type should be "Show (e.g Push)". Click on the segue and in the right panel go to the "attributes inspector" (the 4th one). And here you can check the type.
A view controller like in your case only shows a navigation bar by default, when the view controller itself or one of its parents (connected by a push-segue) is embedded in a navigation controller. Obviously, the navigation controller must not have hidden the navigation bar.
So, you either forgot to put a navigation controller into play or your segue is modal and not push.
Well, it's two years since you asked your question, but when it happened to me, I realized it was because at one point, I had accidentally created my segue as a different kind of segue (a detail one, I think), but changing it back to a "Show" segue didn't actually change it's behavior. When I found the segue in my storyboard xml, it was listed as a "Show" segue, but with a different custom action that suggested it was going to do something completely different.
Anyhoo, deleting and recreating the segue in Xcode fixed it. I probably could have also deleted that custom action in the xml file, too.
Custom transitions are fairly new to me. I had to incorporate them into the last project I worked on and ended up using both the UIViewControllerAnimatedTransitioning protocol and custom segues.
Custom segues seem a bit cleaner/friendly in that you can choose them in a storyboard and be done with it. However there doesn't seem to be as-friendly way to set up a back/pop segue. I've read about unwinding segues but I can't seem to find anything around tying one to the back button of a nav controller.
The UIViewControllerAnimatedTransitioning protocol approach has a bit more set up but allows you to specify both the entering and exit of the views.
In the case of my app not being able to pop back with my custom segues wasn't an issue because the flow of the app doesn't allow you to go back to the previous views. Most applications though require this thus a custom segue seems worthless unless you subclass UINavigationController and allow for custom popping segues.
Am I missing something because it seems UIViewControllerAnimatedTransitioning is the best approach to take for animations between view controllers. Why would I ever want to subclass UIStoryboardSegue?
I agree that there is a lack of documentation on unwind segues compared to other types of segues, but after you get the hang of them, they are pretty straightforward. My understanding is that segues (including unwind segues) is the way that Apple intends you to transition between view controllers. Even when you create custom segues, the regular unwind segues should still function.
In my own work, I have subclassed a UIStoryboardSegue to execute a custom animation when transitioning between segues. Using a widely known app as an example, when you tap the menu button in Uber's app, the map view controller moves down, and a table view controller appears. And when you a tap a row in the table, the new view controller slides in from the right, but the map view controller is still visible on the screen. And when you tap the map view controller, it returns to its original position. For some reason, I believe that Uber actually didn't implement segues at all, but just place view controllers on top of view controllers, but I have implemented something similar in my own app with custom segues. These segues are difficult to replicate with Apple's default segues, so I used custom ones.
If you are tying an unwind segue to a back button, then you will want to override the normal unwind that comes along with the default back button in the uinavigationcontroller. I have found it very difficult to customize that segue. I would recommend hiding the default back button that comes with the uinavigationcontroller, adding your own bar button, and tying this new button to an unwind segue. I know that this is annoying, considering the default back button has some added functionality, such as using the title from the previous view controller as its text when the title is short enough. Unfortunately though, I think Apple really wants to discourage you from customizing the default button and makes it difficult to alter. I have left out how to replace the default back button with the custom one, so let me know if you have trouble.
Anyway, to create the unwind segue, you must first create a method in the class (or parent class) of the uiviewcontroller you are unwinding to (not from).
- (IBAction) methodName:(UIStoryboardSegue *)segueName
You can change the methodName and segueName to whatever you like. Now go to your storyboard, and go to the scene containing the uiviewcontroller you are unwinding from. If you now ctrl drag from this uiviewcontroller (the yellow button on the left side of the bar at the top of the controller) to the exit button (the orange button on the right side of the same bar) you will now see a menu popping up that contains the methodName above. Click that method, and your unwind segue will now be created.
After you have created the unwind segue, you now see it in the outline on the left of the storyboard. If you click the segue, you can inspect it and give it an identifier.
Now to deal with tying it to the back button...
Again, viewing the uiviewcontroller you are unwinding from , if you control drag from the custom back button (not the default back button) in the storyboard to the class of this uiviewcontroller, an IBAction will be created for you tied to the button. In this method, add in:
[self performSegueWithIdentifier: segueIdentifier sender:nil];
where segueIdentiferis the identifier you gave the unwind segue above. Now when you tap the back button, the unwind segue will be executed. You can also do some animations or what not before the unwind segue is executed.
I have actually done some complicated custom unwind segues dealing with animating both the source and destination view controllers. If you can be more specific regarding how you would like the unwinding to look, I can try to help you out.