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Shared code that exists in framework

@objc public protocol Sound {
	@objc optional func woo()
}

public class Foo: NSObject, Sound {
  func action() {
 ((self as Sound).woo ?? default_woo)() // calls `woo` method if available or defaults to default_woo method

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// Framework code
public protocol _XCTestCaseProtocol: NSObjectProtocol {
	func _expectation(description: String) -> _XCTestExpectationProtocol
}
public protocol _XCTestExpectationProtocol {
	func fulfill()
}

extension _XCTestCaseProtocol {
	public func _expectation(description: String) -> _XCTestExpectationProtocol {

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// Source: http://stackoverflow.com/a/40634752/3400034
extension UIAlertController {
	func tapButton(at index: Int, animated: Bool) {
		guard Thread.isMainThread else {
			DispatchQueue.main.async {
				self.tapButton(at: index, animated: animated)
			}
			return
		}
		

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enum Planets: String {
	case Mercury
	case Venus
	case Earth
}

// Add protocol to enums that need it
public protocol UsesRawValue {
	var rawValue: String { get }
}

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// An enum of some planets
enum Planets: String {
	case Mercury
	case Venus
	case Earth
}

// This extension will allow us to use string enums without
// explicitly calling rawValue to get the string
extension Dictionary where Key: ExpressibleByStringLiteral {

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my_viewcontroller.customizerObject = SpecialRed()
my_viewController.customizerObject = SpecialBlue()

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// SWIFT
class SpecialRed: SpecialProtocol<ViewController> {
  override func specialMethod(_ viewController: ViewController) {
    // customization
  }
}

// Objective-C
@interface SpecialBlue: SpecialProtocol<ViewController *>
@end 

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class ViewController: UIViewController {
	
  var customizerObject: SpecialProtocol<ViewController>? 
  
  override func viewDidLoad() {
		super.viewDidLoad()
		
		specialMethod()
		
	}

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@interface SpecialProtocol <
  __covariant VIEW_CONTROLLER: UIViewController *
> : NSObject

- (void)specialMethod:(VIEW_CONTROLLER _Nonnull)viewController;
@end

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protocol SpecialProtocol: class {
	func specialMethod(_ vc: ViewController)
}

class VCCustomizer: NSObject, SpecialProtocol {
	func specialMethod(_ vc: ViewController) {
		// Special implementation
	}
}