How to override a oc category method in .swift - ios

Question

I have a OC UIViewController category , which decleared a class method of UIViewController
+(BOOL)hasStoryBoard;
And I also import this category into xxx-Bridging-Header.h file
My swift class CustomVC is inherited UIViewController. I want override +(BOOL)hasStoryBoard to give a BOOL-type value.This method will called in other class to determine CustomVC's new instance's some feature.
But in my CustomVC.swift I cannot find method like this:
override class func hasStoryBoard()->bool{}
I must override this method to give a YES,or give it's subclass a NO,so on...
I searched this site and find this Swift: How to call a category or class method from Objective-C. In this discussion , explained and tell you how to call the method,not how to override the method .
Can you find solution to override oc category's class method? Or give a workaround in my case.
All my code is :
#interface UIViewController (StoryBoard)
+(BOOL)hasStoryBoard;
-(void)haha;
#end
.
#implementation UIViewController (StoryBoard)
static BOOL hasStoryboard = NO;//默认没有
+(BOOL)hasStoryBoard{
return hasStoryboard;
}
-(void)haha{}
#end
.
class CustomVC: UIViewController {
//this override is correct,have syntax input prompt
override func haha() {
}
//this override is incorrect ,no syntax input prompt
override func hasStoryBoard()->Bool{
return true
}
}

Answer 1

+(BOOL)hasStoryBoard;
defines a class method in Objective-C, but in your Swift subclass
you define an instance method:
override func hasStoryBoard()->Bool{
return true
}
That must be a class method as well:
override class func hasStoryBoard()->Bool{
return true
}
Tip: If you open the Objective-C interface (.h) file in Xcode and
select "Navigate->Jump to Generated Interface" from the Xcode menu
then you'll see excacly how the Objective-C interface is imported to
Swift. In your case:
extension UIViewController {
open class func hasStoryBoard() -> Bool
open func haha()
}
Now you can copy the function definition and use it to define
the overriding method in your subclass.