swift - NSTimer 无法在非 GameScene 的类中工作

Question

这个问题已经有答案了:

Object X of class Y does not implement methodSignatureForSelector in Swift (3 个回答)

已关闭 7 年前。

我似乎无法让 NSTimer 在我创建的类中工作。每次我运行该应用程序时，它都会崩溃并显示以下内容:

2015-11-06 19:23:47.108 Project[30546:7771747] *** NSForwarding: warning: object 0x7b025190 of class 'Project.LogoScreen' does not implement methodSignatureForSelector: -- trouble ahead Unrecognized selector -[Project.LogoScreen show] (lldb)

但是，当我在 GameScene 中使用 NSTimers 时，我没有收到任何错误。

下面是我正在运行但失败的代码:

// Class #1

    import SpriteKit

    var background: SKSpriteNode!

    class GameScene: SKScene {
        override func didMoveToView(view: SKView) {

            anchorPoint = CGPointMake(0.5, 0.5)

            background = SKSpriteNode(color: UIColor.whiteColor(), size: size)
            addChild(background)

            LogoScreen().create()

        }

    }


// Class #2

    import Foundation
    import SpriteKit

        var spriteLogo: SKSpriteNode!
        var spriteScreenLogo: SKSpriteNode!

        class LogoScreen {

            func create() {

                spriteScreenLogo = SKSpriteNode(color: UIColor.blackColor(), size: background.size)
                spriteScreenLogo.zPosition = 1
                background.addChild(spriteScreenLogo)

                spriteLogo = SKSpriteNode(imageNamed: "logo")
                spriteLogo.alpha = 0
                spriteLogo.zPosition = 2
                background.addChild(spriteLogo)

                NSTimer.scheduledTimerWithTimeInterval(3, target: self, selector: Selector("show"), userInfo: nil, repeats: false)

            }

            func show() {

                print("here")

            }

        }

Answer 1

像这样:

        @objc func show() {

            print("here")

        }