Swift ObjC Attribute

import Foundation

// Default inference
@objc class NetworkManager: NSObject {
    @objc var isConnected: Bool = false
    
    @objc func connect() {}
}

// Explicit symbol renaming
@objc(XYZAdvancedNetworkManager)
class AdvancedNetworkManager: NSObject {
    
    // Renaming a method and its parameters for Objective-C
    @objc(updateWithConfiguration:forceRefresh:)
    func update(configuration: [String: Any], force: Bool) {}
}

@objc class DataProcessor: NSObject {
    // Valid: String and Int are bridged to NSString and NSInteger
    @objc func process(data: String) -> Int { return 0 }
    
    // Invalid: Tuples cannot be represented in Objective-C
    // @objc func fetch() -> (String, Int) { return ("", 0) }
}

// Valid: Integer-backed enum exposed to Objective-C
@objc enum Status: Int16 {
    case active
    case inactive
}

// Valid: Applying @objc to an extension implicitly exposes all eligible members
@objc extension DataProcessor {
    func reset() {} // Implicitly @objc
    func flush() {} // Implicitly @objc
}

@objcMembers
class Configuration: NSObject {
    var timeout: Double = 30.0 // Implicitly @objc
    var retries: Int = 3       // Implicitly @objc
    
    // Not exposed to Objective-C due to incompatible type (Tuple)
    var metadata: (String, String)? 
}

class Session: NSObject {
    // Exposed to Obj-C, but may still be statically dispatched in Swift
    @objc func start() {} 
    
    // Exposed to Obj-C AND forced to use Objective-C message passing
    @objc dynamic func terminate() {} 
}

struct NativeConfiguration {
    // Native Swift dynamic dispatch, completely independent of Objective-C
    dynamic func update() {}
}