How would I go about adding 2 classes when one is a base and the other is derived?
Should I add an Employee(base) class then under Inherit the Receptionist(derived) class?
Related
I'm wanting to write a base class that, when derived from, contains code stubs like it does when you descend from a UITableViewController. It automatically stubs in code, #warnings, and comments in the descended class.
For example: (if my class has the equivalent of an abstract method that they need to implement then it should appear in the new class automatically.)
-(int)thisNeedsToBeImplemented{
``#warning Incomplete implementation, return the int value needed.
}
I haven't been able to find a relevant article.
In my class I'm referencing a utils object that holds some consts. That utils object inherits from a parent utils object that also has consts. In my class, I want to access the parent's companion consts via a reference to the child utils class. Is this possible?
EDIT
This isn't technically necessary (simply referencing the base class works in my specific case) but I'm still interested from a language perspective if this is possible.
Companion objects and their members can only be accessed via the containing class name, not via instances of the containing class. [...] If you try to redeclare a companion object in a subclass, you'll just shadow the one from the base class.
In other words: It's not possible, as both companion objects are completely unrelated.
I have an app which uses maps on several different screens. All the maps should display the same basic information (annotations and overlays), but every instance adds different additional annotations and overlays to the map. I want to create a class, which implements the common features and behaves exactly like the MKMapView. How is this possible?
I've had three ideas to solve this, but none of them seems to be a good solution.
Subclass MKMapView. The problem with this approach is that the map gets the information about it's annotations and overlays from it's delegate, which should be the subclass (a view...) itself, therefore adding additional data is problematic (I can't set the delegate other than the class itself).
Wrap MKMapView. I could create an NSObject/UIView subclass which has an MKMapView, but either I have to proxy all of the map's methods to my class or access the map with a knowledge of the inner objects (myMapView.mapView.xxx...).
Create a delegate class (NSObject with MKMapViewDelegate functions). The delegate class could then implement the common behavior. This solution also has issues similar to the first one.
How can I solve this elegantly?
Create a class and Add Map to view of that class.
Now make that class as parent class for all class where you want to add Mapview.
Provide data to parent class when you want to add annotations and overlays.
I am trying to add swift library in my objective c project
https://github.com/vimeo/VimeoUpload
I have already added #import “-Swift.h” in my project
to subclass VimeoUpload, I am adding #objc in class definition and it gives me following error
Generic subclasses of '#objc' classes cannot have an explicit '#objc' attribute because they are not directly visible from Objective-C.
Objective-C doesn't support Swift Generics, that is why you can't add #objc directive to your class.
Totally being a newbie by to objective C this perplexing question occurred to me .
So here it is,
Lets say say we have a viewcontroller that implements UITableViewDelegate.If we extends this viewcontroller does the child class inherits the UITableViewDelegate callback methods. So we can override the certain callbacks like cellForRowAtIndexPath etc. from the child class.
Have a good day
Yes, absolutely. The child class will also conform to the protocol. The implementation of these methods is taken in the superclass, or in the child class if it is redefined in it.