compile failed with method conflict error

[LeeKM]

when i has code below in my project

class CustomView: UIView {
     weak var viewController : ViewController?
}

I got an compile error
Getter for 'viewController' with Objective-C selector 'viewController' conflicts with method 'viewController()' from superclass 'UIView' with the same Objective-C selector,is there any way to fix this problem without changing my code ?

[hackiftekhar]

You are getting this because there is a ViewController method in a UIView category in my library. You could try changing your variable name.

[hackiftekhar]

I checked this and found that if UIView has other category class having same method name then library code compiles fine and works fine. This is the only issue with subclasses. So I decided to keep viewController method name as it is and doesn't change anything.

[dodikk]

@hackiftekhar , I am experiencing a similar issue. My project is using both IQKeyboardManager and a proprietary Scandit SDK

The name conflict is caused by two third-parties, so changing a property name is not an option for me.
What would you suggest?

/**
* Inside ScanditBarcodeScanner.framework
*/
@interface SBSBarcodePickerView : UIView
{
  // ...

   @property (nonnull, nonatomic, strong, readonly) SBSBarcodePicker *viewController;
}

P.S. Could you please re-consider using some sort of prefixes for your UIKit extensions?

[dodikk]

Detaching the introspection logic from UIView could be a good option too.
That would look a bit less "elegant" but a class would implicitly get the swift module's namespace and hence it would be protected from such naming conflicts.

class UIViewUtils
{
   public static func viewController(for view: UIView)->UIViewController? 
   {
        var nextResponder: UIResponder? = view
        
        repeat {
            nextResponder = nextResponder?.next
            
            if let viewController = nextResponder as? UIViewController {
                return viewController
            }
            
        } while nextResponder != nil
        
        return nil
   }


// rest of IQUIView+Hierarchy methods rewritten in the same manner
}

[dodikk]

So my workaround is making another category... In Objective-C...

#import <ScanditBarcodeScanner/ScanditBarcodeScanner.h>

@interface SBSBarcodePickerView (ViewControllerGetter)

@property (nonnull, nonatomic, strong, readonly) SBSBarcodePicker* scanVC;

@end

#import "SBSBarcodePickerView+ViewControllerGetter.h"

@implementation SBSBarcodePickerView (ViewControllerGetter)

@dynamic scanVC;

-(SBSBarcodePicker*)scanVC
{
    return self.viewController;
}

@end

[hackiftekhar]

hmm, thanks for letting me know, I'll try to change it's name with some prefix.

[hackiftekhar]

It's now fixed