I need to create two Segue's from the same button, and then I want to programatically choice which one to use based on device orientation. The problem I'm having is that you can only seem to create one segue from a button to another view so when I add the second one it just changes the first.
How do you add a segue that either isn't linked to a button etc so I can do programatically or how are you supposed to do this. I want to have two views that get dynamically picked based on orientation rather than moving the objects based via code when rotated as there is alot of objects and custom stuff that would make it much simplier just to have two views.
You'd have to trigger the segue manually. Hook up the button to a method, then make two segues, one from each view controller to the other in your storyboard, then give it an identifier in IB, then in your method you can call "performSegueWithIdentifier:".
Additional Info
To make a manual segue, control-click from the view controller object in IB to another view controller and the box will pop up as "Manual Segue". Just make sure it has an identifier.
I would think you could have the button trigger an IBAction wherein you could make a choice based on orientation and then trigger the appropriate segue programmatically.
Related
I have a couple of UIViewcontrollers with buttons on each one that change you from one view controller to another. But whenever I click those buttons, the ViewControllers pop up as a Pop Over, and I need them to switch to a different screen.
You need to change the Presentation attribute of your ViewController from Automatic to Current Context.
In this context, you do not need a custom segue; those are defined programmatically anyway.
See this, and this for more clarification.
I need to navigate inside folders and files in directory (from server). The problem is that I don't know the number of folders so it's not possible to use performSegueWithIdentifier statically. How can I use navigation controller with dynamically number of view controllers in swift? I want to "push" a new view controller every time a user tap on a folder in order to list files/folders inside it and I want to do it with UINavigationController so the user have the possibility to go back with "previous" button.
Both storyboard and programmatically approaches are ok.
Thanks you
Storyboards and segues are just a crutch. Think about how you would do this without them. At each level, to go down a level, you would just instantiate a new view controller and push it onto the navigation controller stack with pushViewController:animated:.
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UINavigationController_Class/#//apple_ref/occ/instm/UINavigationController/pushViewController:animated:
And in fact it takes only one view controller class to do this, since any instance can create and push another instance of its own class. The display of one folder is exactly like the display of any other.
So if you wanted to configure this notion in a storyboard, you would have a circular segue, that is, the view controller would have a push / show segue leading to itself.
I agree with #matt's answer, just create the controller and push it. For sake of completeness, you can do this in a Storyboard with a segue.
Here's how:
So that you can call the segue programmatically, add an additional prototype cell to your tableView. (You do this because you don't want the segue to be automatically triggered when the tableViewCell is selected. By using an additional prototype cell, the segue can be wired up, but it will never be triggered automatically since this prototype cell will never actually be instantiated.)
Control-drag from this prototype cell to the viewController icon at the top of the tableViewController. Select "Show" from the pop-up.
Find this segue in the Document Outline View and give it an identifier such as "showFolderSegue" in the Attributes Inspector.
Now, when you want to trigger the segue, call: self.performSegueWithIdentifier("showFolderSegue", sender: self)
You can use prepareForSegue to set up the new tableViewController as you normally would.
This method too works with a single tableViewController.
I have a login system created. It uses a user ID instead of username and password. I want to make it so when the login button is pressed, it opens another view controller in my storyboard. I already have an if statement checking the user ID to see if it is correct. I just need to know the method to perform. I have tried a few, but I need more explanation of how to use them.
There are a couple of ways to do this. The first is to create a segue that directly links the login button to the new view controller. If you want to do this, right click drag (or control drag) from the button to the new view controller. This should make a grey line going from the first controller to the second one. You can then click on the little circle in the middle of the segue in interface builder to give it a name and specify the type.
Alternatively, if you created the login button with code, or would just like more control over your segues, you can create a generic segue in interface builder, meaning just control drag from one view controller to the other. If you do it this way, YOU MUST NAME THE SEGUE so you have a way to invoke it later. Then you just call [self performSegueWithIdentifier:#"nameOfYourSegue" sender:self]; to make the segue happen.
If you need to configure the new view controller at all or give it any data, this should happen in the prepareForSegue: method.
Here's a link to a nice tutorial on segues:
http://www.appcoda.com/storyboards-ios-tutorial-pass-data-between-view-controller-with-segue/
I think this could be a simple question but I cannot seem to figure it out.
I have a screen which displays questions from an array. When the array has reached the end I want it to display another VC I have created. With all my other VC they are connected in the storyboard using segues between them. However, I only want this screen to display if I have reached the end of my array? Is what I am trying to doing making sense? Or does anyone know of any useful tutorials I could look at to figure it out for myself?
You can "manually" fire a seque with the performSegueWithIdentifier:sender: method using the segue identifier that you set on the segue in the storyboard. When you call that method the system sets up the right information and then executes prepareForSegue:sender: and then actually does the segue -- so the setup looks the same as an automatic segue trigger.
You can "manually" perform any segue with an identifier.
As to creating the segue to perform, you can create a segue from one View Controller to another in the storyboard (i.e. control-drag from the View Controller in the sidebar not from a button or a TableView cell or whatever). This sort of segue will have to be performed "manually".
Your call to do the "NextVCPlease" segue might look like:
if (lastQuestionDone) {
[self performSegueWithIdentifier:#"NextVCPlease" sender:whateverMakesSense]
}
I want to swap out one view controller for another in an existing XCode iOS storyboard, but I'd rather not recreate the segues going to it. Is it possible to move or adjust the destination of an existing segue?
I believe you do need to create the new segue(s), but that's as easy as control-dragging between the source of the segue and your new scene. And if your code is doing anything that requires the storyboard id (such as prepareForSegue or performSegue), then just apply the same storyboard id for your new segue and you don't need to change your code. If you're using a custom segue, you can just use the same segue class, so you don't need to change the code just because the destination changed. And if the source of your segue is a button or something like that, when you make the segue to the new scene, your old segue is automatically removed, so that simplifies the process, too.
In short, you probably do need to recreate the segues, but you probably don't need to change your code too much to support that.