添加 ViewController 时出现“无法识别的选择器发送到实例”错误

Question

我最近尝试在我的 AR 应用中添加一个欢迎屏幕，用作主屏幕。当应用加载时，用户可以点击按钮，然后应用冻结、崩溃并显示代码

 "Thread 1: "-[_0_2_2020_2.WelcomeViewController letsGo:]: unrecognized selector sent to instance 0x13ec05e00"

• 我已经尝试了一些可用的解决方案，但我无法提出解决方案。我认为这与我的 *IBAction 连接有关。非常感谢任何帮助！

   import UIKit
   import RealityKit
   import ARKit
  
   class WelcomeViewController: UIViewController {
  
  
  
    @IBAction func gotPressed(_ sender: Any) {let storyboard = UIStoryboard(name: "Main", 
    bundle: nil)
       if let viewController = storyboard.instantiateViewController(withIdentifier: 
   "ViewController") as? ViewController {
        self.present(viewController, animated: true, completion: nil) /// present the view 
   controller (the one with the ARKit)!
    }    }
  
  
  }
  
  
  
    class ViewController: UIViewController, ARSessionDelegate {
       //delay app launch to show splash screen
      func application(_ application: UIApplication, didFinishLaunchingWithOptions 
    launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
          Thread.sleep(forTimeInterval: 3.0)
          // Override point for customization after application launch.
          return true
     }
   //end splash screen delay
   @IBOutlet var arView: ARView!
  
    override func viewDidLoad() {
    super.viewDidLoad()
  
    arView.session.delegate = self
  
    showModel()
    overlayCoachingView()
    setupARView()
  
    arView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleTap(recognizer:))))
  
    }
  
  func showModel(){
  
    let anchorEntity = AnchorEntity(plane: .horizontal, minimumBounds:[0.7, 0.7])
  
    anchorEntity.scale = [0.2, 0.2, 0.2]
  
      let entity = try! Entity.loadModel(named: "COW_ANIMATIONS")
      entity.setParent(anchorEntity)
  
      arView.scene.addAnchor(anchorEntity)
  
  
    }
  //Overlay coaching view "adjust iphone scan"
  func overlayCoachingView () {
  
    let coachingView = ARCoachingOverlayView(frame: CGRect(x: 0, y: 0, width: arView.frame.width, height: arView.frame.height))
  
    coachingView.session = arView.session
    coachingView.activatesAutomatically = true
    coachingView.goal = .horizontalPlane
  
    view.addSubview(coachingView)
  
  }//end overlay
  
  
  func setupARView(){
    arView.automaticallyConfigureSession = false
    let configuration = ARWorldTrackingConfiguration()
    configuration.planeDetection = [.horizontal, .vertical]
    configuration.environmentTexturing = .automatic
    arView.session.run(configuration)
  }
  
  //object placement
  
  @objc
  func handleTap(recognizer: UITapGestureRecognizer){
    let location = recognizer.location(in:arView)
  
    let results = arView.raycast(from: location, allowing: .estimatedPlane, alignment: .horizontal)
  
    if let firstResult = results.first {
        let brownCowAnchor = ARAnchor(name: "COW_ANIMATIONS", transform: firstResult.worldTransform)
        arView.session.add(anchor: brownCowAnchor)
    } else {
        print("Object placement failed - couldn't find surface.")
  
  
  
        //cow animations
        //let robot = try! ModelEntity.load(named: "COW_ANIMATIONS")
       let brownCowAnchor = AnchorEntity()
        let blackCowAnchor = AnchorEntity()
  
        //anchor.children.append(robot)
        //arView.scene.anchors.append(anchor)
  
        //robot.playAnimation(robot.availableAnimations[0].repeat(duration: .infinity),
                                                      //transitionDuration: 0.5,
                                                            //startsPaused: false)
  
        //start cow animation
  
  
        let brownCow = try! ModelEntity.load(named: "COW_ANIMATIONS")
        let blackCow = try! ModelEntity.load(named: "Cow")
  
        brownCow.position.x = -1.0
        blackCow.position.x = 1.0
        brownCowAnchor.position.z = -2.0
        blackCowAnchor.position.z = -2.0
        brownCow.setParent(brownCowAnchor)
        blackCow.setParent(blackCowAnchor)
        arView.scene.anchors.append(brownCowAnchor)
        arView.scene.anchors.append(blackCowAnchor)
  
        let cowAnimationResource = brownCow.availableAnimations[0]
        let horseAnimationResource = blackCow.availableAnimations[0]
  
        brownCow.playAnimation(cowAnimationResource.repeat(duration: .infinity),
                                            transitionDuration: 1.25,
                                                  startsPaused: false)
  
        blackCow.playAnimation(horseAnimationResource.repeat(duration: .infinity),
                                                transitionDuration: 0.75,
                                                      startsPaused: false)
  
        //end cow animations
    }
  }
  
  func placeObject(named entityName: String, for anchor: ARAnchor)  {
    let entity = try! ModelEntity.loadModel(named: entityName)
  
    entity.generateCollisionShapes(recursive: true)
    arView.installGestures([.rotation, .translation], for: entity)
  
  
    let anchorEntity = AnchorEntity(anchor: anchor)
    anchorEntity.addChild(entity)
    arView.scene.addAnchor(anchorEntity)
  
  
  }
  }
  

Answer 1

该按钮正在触发一个函数letsGo，它不会出现在您发布的WelcomeViewController 的任何位置。检查界面生成器并确保您已从按钮中删除旧连接。应该是最后一个选项卡。