I have many classes subclasses of UIViewController. I would like to create another subclass of UIViewController and then make all my previous classes become subclasses of this one. Is that possible? If yes, how?
To clarify:
UIViewController > my previous UIViewControllers
now, what I would like:
UIViewController > new UIViewController > my previous UIViewControllers
Try looking up categories. They are an objective C way of extending a class. This way rather than having to go back and change your original code.
Related
In order to fix bug I need to change a UIViewController into a UITableViewController. Only thing is that the current viewController is a subclass of a base UIViewController. How can I inherit behavior from base? Creating a whole other BaseTableViewController sounds very redundant.
In my project I have two view controllers, and I am having trouble connecting objects such as an UIImageView to the view controller. When I try to create the IBOutlet, it tells me that "Could not insert new outlet collection: could not find any information for the class named UIViewController". I believe this problem stems from the fact that my original declaration of my class is as follows:
class UIViewController: UIViewController {
when in fact the view controller is named mainScene instead. However, when I change the first UIViewController to what I think it should be (mainScene), it doesn't even show me the option of connecting an IBOutlet...
class mainScene: UIViewController {
So, I have two questions.
Do I need to have a whole separate class for the second UIViewController and would that solve my issues?
Is there a better way to link objects to the UIViewController or am I just doing something horribly wrong (the likely scenario)?
Thanks so much
Short answer: 1. Yes, and yes. 2. There's no better way, and you're not doing something horribly wrong. (You probably just missed a step.)
You have two view controllers. Assuming they are different, you would subclass each one from UIViewController with a different name. E.g., mainSceneViewController and otherSceneViewController.
Your mainSceneViewController and otherSceneViewController would each have their own properties and IBOutlets.
Where you're probably stuck, is needing to change the class of your viewController within Interface Builder to match the class name in its .swift file, so IB knows what outlets it can connect for that view controller.
Each scene in your storyboard corresponds to a view controller. When the segue is performed, iOS instantiates your view controller from the storyboard.
While it is possible to only have one view controller subclass, and use the same subclass for different views, it doesn't happen too often.
Update:
Subclassing lets you add properties and methods to a class, and override their superclass.
In your comment, UIViewController is the class, and mainSceneViewController is subclassed from UIViewController. For your second view controller, it would likely be class otherSceneViewController: UIViewController {, as your other scene would likely require a different properties and methods from your main scene view controller.
You can read more about Inheritance in the Swift Programming Language guide.
I am writing a simple app with custom storyboards for iPhone and iPad. I have a generic viewcontroller class from which my custom iPhone and iPad viewcontrollers inherit. Outlets and IBActions in my storyboards are mostly wired up to the generic viewController class and everything works well.
Now for stylistic reasons I decided to make my iPhone's viewcontroller be a UITableViewController and it can no longer inherit from my generic viewcontroller. I've been googling and searching this site and see advice which says I should write a category and use this in my custom classes.
I have never done this, but I looked at the documentation and understand the concept, but once I move my code into a category, how would I be able to link my storyboard's outlets and actions (ctrl-drag from storyboard) to the methods which are now moved out of my custom viewcontroller classes? Usually I would for example ctrl-drag from a switch in the storyboard to an existing IBAction method in my generic viewController, but these methods will now be inherited and not showing my my custom classes to drag to.
I am just a hobbyist and newb, so I apologize if this question is too basic.
You can use UIViewController with UITableView instead of UITableViewController.
1.In storyboard, get a new UIViewController and linking with your custom viewcontroller class.After that,put an UITableView into that UIViewController and linking with that class using (ctrl-drag from storyboard) called mTableView
2.In that class you should implement <UITabBarControllerDelegate,UITableViewDataSource>.
Use mTableView instead of self.tableView just like in UITableViewController.
I have 30+ viewcontroller in my project, and there is a behavior to be added in 28 of them.
When a button is clicked if 10 second not passed in that viewcontroller, I need to present a alertview sliding from top. (I have already implemented this behaviour for one of them)
But my question is, how can I inherit this behavior in a proper way for all of these viewcontrollers?
Googling this, but cannot find relavent solutions.
If all of your view controllers that need this functionality are subclasses of UIViewController, i.e. not UITableViewController or another subclass of UIViewController, you can create a subclass of UIViewController, say ButtonClickAlertViewController (or whatever makes sense) that implements the functionality you need to replicate. Then have all of the classes that need this functionality subclass your ButtonClickAlertViewController class instead of UIViewController.
You may need to take into account how this specific functionality integrates into each of your individual view controller classes. For example, you may need a method in your ButtonClickAlertViewController class that signals a button has been clicked in order to check your timer and possibly display an alert. In each of your classes that subclass ButtonClickAlertViewController, you might need to call this method in each of the IBAction methods that your button click actions call.
Subclass UIViewController and add your desired behavior for all view controllers and then subclass your existing view controllers from the viewController with the desired behavior.
Inheritance chain:
UIViewController -> ViewControllerWithBehaviorForAll ->
YouExistingViewlContollersWhichNeedTheBehavior
I'm trying to add the ECSlidingViewController in my project, but I'm a novice on iOS and I'm not sure what to do in order to follow the instructions: "Add a UIViewController to your storyboards and set the subclass to ECSlidingViewController"
I've added the UIViewController, but now how do I set the subclass?
I don't use storyboards, but it sounds like you have to set custom class for this controller in identity inspector.
Suppose, you added an UIViewController in StoryBoard named "InitialSlidingViewController".
Then in InitialSlidingViewController.h, you should make the interface declaration as follows.
#interface InitialSlidingViewController : ECSlidingViewController
And please check the demo given by "ECSlidingViewController". You will understand it then.
I think you've got class and subclass the wrong way around.
What you are creating is a class called ECSlidingViewController that is a subclass of UIVIewController.
In you ECSlidingViewController.h you should have the following...
#interface ECSlidingViewController : UIViewController
This means you are defining a class called ECSlidingViewController and it is a subclass of UIViewController.