Bridging an optional bool from Swift to Objective-C

swift-to-objc-bool-bridge.m

@implementation MyObjcClass
    
    . . .
    
    if(mySwiftClassInstance.hasFeatureBridged == nil) {
        // handle nil case
    }
    else if(mySwiftClassInstance.hasFeatureBridged boolValue] == YES) {
        // handle true case
    }
    else {
        // handle false case
    }

    . . .
        
@end

swift-to-objc-bool-bridge.swift

class MySwiftClass: NSObject {
    
    /// Can’t be seen by Objective-C because it can’t represent a nil value.
    private(set) var hasFeature: Bool?
    
    /// Can be seen by Objective-C because it can represent a nil object.
    var hasFeatureBridged: NSNumber? {
        guard let feature = hasFeature else { return nil }
        return NSNumber(value: feature)
    }
    
    . . .
}

Hi everyone. I have a question, I want to program iOS applications, so I have a question, how to do this, by learning Swift or by learning objective C? I read this so I am a little bit confused, what to learn?