如何解决过渡过程中SKTransition效果不起作用？

Question

从场景过渡到MainScene时，SKTransition不起作用。它只是跳转到MainScene，没有过渡效果。你可以在下面找到代码。

import UIKit
import SpriteKit
import GameplayKit
import FBSDKLoginKit
import TwitterKit
import Firebase
import GoogleSignIn
import GoogleMobileAds

protocol SceneManagerDelegate {
    func presentMainScene()
    func presentGameScene()
    func presentWelcomeScene()
    func presentGameOverScene()
    func presentSettingsScene()
}

class GameViewController: UIViewController, TransitionDelegate, GIDSignInDelegate, GIDSignInUIDelegate, GADRewardBasedVideoAdDelegate, UIAlertViewDelegate{
    /.....
}
/....
extension GameViewController: SceneManagerDelegate {            
    func presentSettingsScene() {
        let settingsScene = SettingsScene(fileNamed: "SettingsScene")
        settingsScene?.sceneManagerDelegate = self
        present(scene: settingsScene!)
    }

    func presentGameOverScene() {
        let gameOverScene = GameOverScene(fileNamed: "GameOverScene")
        gameOverScene?.sceneManagerDelegate = self
        present(scene: gameOverScene!)
    }    

    func presentWelcomeScene() {
        let welcomeScene = WelcomeScene(fileNamed: "WelcomeScene")
        welcomeScene?.sceneManagerDelegate = self
        present(scene: welcomeScene!)
    }

    func presentMainScene() {
        let mainScene = MainScene(fileNamed: "MainScene")
        mainScene?.sceneManagerDelegate = self
        present(scene: mainScene!)
    }

    func presentGameScene() {
        let gameScene = GameScene(fileNamed: "GameScene")
        gameScene?.sceneManagerDelegate = self
        present(scene: gameScene!)
    }

    func presentMatchingScene() {
        let matchingScene = MatchingScene(fileNamed: "MatchingScene")
        matchingScene?.sceneManagerDelegate = self
        present(scene: matchingScene!)
    }    

    func present(scene: SKScene) {
        let transition = SKTransition.reveal(with: .left, duration: 1)
        if let view = self.view as! SKView? {
            if let gestureRecognizers = view.gestureRecognizers {
                for recognizer in gestureRecognizers {
                    view.removeGestureRecognizer(recognizer)
                }
            }

            scene.scaleMode = .aspectFit
            scene.delegate = self as TransitionDelegate
            view.presentScene(scene, transition: transition)
            view.ignoresSiblingOrder = true
            view.showsNodeCount = true
            view.showsFPS = true
        }
    }
}

从其他场景调用该方法

var sceneManagerDelegate: SceneManagerDelegate? // sceneManagerDelegate.present....

Answer 1

您的转换函数是正常的，但您的委托实现是错误的。在您的present(scene:)方法中，您将scene.delegate = self设置为TransitionDelegate，它将不在那里。我已经在in method in Swift 4中实现了你的转换代码，它工作得很好。你可以使用see this tutorial for Delegate implementation for transition in SpriteKit。另请阅读KnightOfDragon提供的this answer。