#cswift

switch instance {

case 0 as Double: print("0 of Double")

case let value as Int: print("\(value) of Int")

case is Double: print("Double")

}

let object = "Casual" as AnyObject

let count: Int? = object.length let _: Void? = object.append?("Swift")

// 通常通りに実行可能（メソッドは IUO 属性付き） let result: String = object.appending("Swift")

// 通常は、メソッドに応じられない場合は強制終了 let result: String = object.appending("Swift")

// メソッドに ? をつけて、ディスパッチ可能性も判定 let result: String? = object.appending?("Swift")

// 通常通りに実行可能、ただし戻り値は Optional 型 let count: Int? = object.length

class MyClass : NSObject {

func myFunction(_ v: Int) -> Int {…} }

let object = MyClass() as AnyObject let result: Int? = object.myFunction?(10)

class MyClass : NSObject {

func myFunction(_ v: Any) -> NSNumber {…} }

let object = MyClass() as NSObject let result: Unmanaged<AnyObject>? = object.perform(MyClass.myFunction(_:), with: 5) let resultValue: Int? = result?.takeRetainedValue().intValue

protocol MyClassProtocol : AnyObject { }

class MyClass : NSObject, MyClassProtocol { func myFunction(_ v: Int) -> Int {…} }

let object = MyClass() as MyClassProtocol let result: Int? = object.myFunction?(10)

class Object : NSObject { func method1() -> Int {…} @nonobjc func method2() -> Int {…} }

let object = Object() as AnyObject

let result1 = object.method1?() // .some(x) let result2 = object.method2?() // .none

// 原則、動的ディスパッチが可能 class Object : NSObject {

func method1() -> Int {…}

// 動的ディスパッチしたくないものに @nonobjc を付与 @nonobjc func method2() -> Int {…} }

// 原則、動的ディスパッチは不可 class Object {

func method1() -> Int {…}

// 動的ディスパッチしたいものに @objc を付与 @objc func method2() -> Int {…} }

@objc protocol Protocol {

func method() }

class Object : Protocol {

func method() {} }

class Object { @objc(otherName) func originalName() {} }

let object = Object() as AnyObject

object.originalName?() // .some(())

object.otherName?()

class OtherClass { @objc func otherName() {} } class Object { @objc(otherName) func originalName() {} } let object = Object() as AnyObject

object.originalName?() // .some(()) object.otherName?() // .some(())

class OtherClass { @objc func originalName() {} @objc func otherName() {} } class Object { @objc(otherName) func originalName() {} } let object = Object() as AnyObject

object.originalName?() // ambiguous use of … object.otherName?() // .some(())

class MyClass : NSObject {

func myFunction(_ v: Int) -> Int {…} }

let object = MyClass() as AnyObject let result: Int? = object.xxxx?(10)

func doSomething() {

class Object: NSObject {

// このシグネチャーは認識されない。動的実行は可 func someMethod() {} } }