我目前正在使用swift 4和Xcode 9.2版开发AR应用程序，但是我一直遇到这个错误，即即使我已多次检查以确保建立连接，连接我的SCNView的IBOutlet都返回nil。我尝试删除DerivedData文件夹，以断开和重新连接插座，以替换视图控制器，但没有任何效果。对于我来说真的很奇怪，直到今天一切都无缝地工作了。这是我的ViewController代码：
import UIKit
import SceneKit
import ARKit
class ViewController: UIViewController, ARSCNViewDelegate {
@IBOutlet var sceneView: ARSCNView!
private var hud: MBProgressHUD!
private var newAngleY: Float = 0.0
private var currentAngleY: Float = -0.39
private var currentAngleX: Float = -1.64
private var newAngleX: Float = 0.0
private var localTranslationPosition: CGPoint!
private var counter: Int = 0
private var upConstraints: [NSLayoutConstraint] = []
override func viewDidLoad() {
super.viewDidLoad()
// Set the view's delegate
sceneView.delegate = self
// Show statistics such as fps and timing information
sceneView.showsStatistics = true
// Create a new scene
let scene = SCNScene()
// Set the scene to the view
sceneView.scene = scene
// Views + Buttons
let startButton = UIButton(frame: CGRect(x:200 , y: 0, width: 100, height: 50))
startButton.backgroundColor = .black
startButton.setTitle("Button", for: .normal)
startButton.setTitle("Start", for: .normal)
startButton.titleLabel!.font = UIFont(name: "AppleSDGothicNeo-Light", size: UIFont.systemFontSize)!
startButton.addTarget(self, action: #selector(start), for: UIControlEvents.touchUpInside)
self.view.addSubview(startButton)
let hideButton = UIButton(frame: CGRect(x: 0, y: 0, width: 100, height: 50))
hideButton.backgroundColor = .black
hideButton.setTitle("Hide Node", for: .normal)
hideButton.titleLabel!.font = UIFont(name: "AppleSDGothicNeo-Light", size: UIFont.systemFontSize)!
hideButton.addTarget(self, action: #selector(hideNode), for: UIControlEvents.touchUpInside)
self.view.addSubview(hideButton)
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Create a session configuration
let configuration = ARWorldTrackingConfiguration()
// Run the view's session
sceneView.session.run(configuration)
// Detects horizontal Planes
configuration.planeDetection = .horizontal
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
// Pause the view's session
sceneView.session.pause()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Release any cached data, images, etc that aren't in use.
}
// MARK: - ARSCNViewDelegate
/ * //覆盖以为添加到视图会话的锚创建和配置节点。 func renderer（_ renderer：SCNSceneRenderer，nodeFor锚点：ARAnchor）-> SCNNode？ { 让节点= SCNNode（）
return node
}
* /
func session(_ session: ARSession, didFailWithError error: Error) {
// Present an error message to the user
}
func sessionWasInterrupted(_ session: ARSession) {
// Inform the user that the session has been interrupted, for example, by presenting an overlay
}
func sessionInterruptionEnded(_ session: ARSession) {
// Reset tracking and/or remove existing anchors if consistent tracking is required
}
//objc funcs
@objc func start () {
if let bodyNode = self.sceneView.scene.rootNode.childNode(withName: "Man", recursively: true) {
let question = CreateQuestions()
question.moveNode(eular: false, organ: DigestiveSystemParts.mouth, node: bodyNode)
let button = UIButton(frame: CGRect(x:200 , y: 100, width: 100, height: 50))
button.backgroundColor = .black
button.setTitle("Button", for: .normal)
button.setTitle("Start", for: .normal)
button.titleLabel!.font = UIFont(name: "AppleSDGothicNeo-Light", size: UIFont.systemFontSize)!
button.addTarget(self, action: #selector(down), for: UIControlEvents.touchUpInside)
self.view.addSubview(button)
}
}
@objc func down () {
if let bodyNode = self.sceneView.scene.rootNode.childNode(withName: "Man", recursively: true) {
let moveDown = SCNAction.move(by: SCNVector3(0,-0.7,1.7), duration: 2)
bodyNode.runAction(moveDown)
let button = UIButton(frame: CGRect(x:200 , y: 100, width: 100, height: 50))
button.backgroundColor = .black
button.setTitle("Button", for: .normal)
button.setTitle("Start", for: .normal)
button.titleLabel!.font = UIFont(name: "AppleSDGothicNeo-Light", size: UIFont.systemFontSize)!
button.addTarget(self, action: #selector(rotate), for: UIControlEvents.touchUpInside)
self.view.addSubview(button)
}
}
@objc func rotate () {
if let bodyNode = self.sceneView.scene.rootNode.childNode(withName: "Man", recursively: true) {
let rotate = SCNAction.move(by: SCNVector3(0,0,1.2), duration: 10)
bodyNode.runAction(rotate)
let button = UIButton(frame: CGRect(x:200 , y: 100, width: 100, height: 50))
button.backgroundColor = .black
button.setTitle("Button", for: .normal)
button.setTitle("Start", for: .normal)
button.titleLabel!.font = UIFont(name: "AppleSDGothicNeo-Light", size: UIFont.systemFontSize)!
button.addTarget(self, action: #selector(slide), for: UIControlEvents.touchUpInside)
self.view.addSubview(button)
}
}
@objc func slide () {
if let bodyNode = self.sceneView.scene.rootNode.childNode(withName: "Man", recursively: true) {
let rotate = SCNAction.move(by: SCNVector3(0, 3,0), duration: 10)
bodyNode.runAction(rotate)
}
}
@objc func hideNode () {
sceneView.scene.rootNode.enumerateChildNodes { (bodyNode, stop) in
bodyNode.removeFromParentNode() }
counter = 0
}
//Gesture recognizers
private func registerGestureRecognizers() {
let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(pinched))
self.sceneView.addGestureRecognizer(pinchGesture)
let tapGestureRecognizer = UITapGestureRecognizer(target:self, action: #selector(tapped))
self.sceneView.addGestureRecognizer(tapGestureRecognizer)
let panGestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(panned))
self.sceneView.addGestureRecognizer(panGestureRecognizer)
let longPressedGestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(longPressed))
}
@objc func longPressed (recognizer: UILongPressGestureRecognizer) {
print("heyno")
if let bodyNode = self.sceneView.scene.rootNode.childNode(withName: "Man", recursively: true) {
let mouth = bodyNode.childNode(withName: "Mouth", recursively: true)
guard let sceneView = recognizer.view as? ARSCNView else {
return
}
let touch = recognizer.location(in:sceneView)
let hitTestResults = sceneView.hitTest(touch, options: nil)
if hitTestResults.first?.node == mouth
{
print("hey")
}
}
}
@objc func panned(recognizer :UIPanGestureRecognizer) {
if recognizer.state == .changed {
guard let sceneView = recognizer.view as? ARSCNView else {
return
}
let touch = recognizer.location(in: sceneView)
let translation = recognizer.translation(in: sceneView)
if let bodyNode = self.sceneView.scene.rootNode.childNode(withName: "Man", recursively: true) {
self.newAngleY = Float(translation.x) * (Float) (Double.pi)/180
self.newAngleY += self.currentAngleY
bodyNode.eulerAngles.y = self.newAngleY
self.newAngleX = Float(translation.y) * (Float) (Double.pi)/180
self.newAngleX += self.currentAngleX
bodyNode.eulerAngles.x = self.newAngleX
print("eulx: \(bodyNode.eulerAngles.x)")
print("euly: \(bodyNode.eulerAngles.y)")
}
}
else if recognizer.state == .ended {
self.currentAngleY = self.newAngleY
self.currentAngleX = self.newAngleX
}
}
func presentQuestion () {
}
@objc func tapped(recognizer: UITapGestureRecognizer) {
if self.sceneView.scene.rootNode.childNode(withName: "Man", recursively: true) != nil {
}
var bodyNode: SCNNode!
let bodyScene = SCNScene(named:"art.scnassets/Man.scn")!
bodyNode = bodyScene.rootNode.childNode(withName: "Man", recursively: true)
guard let sceneView = recognizer.view as? ARSCNView else{
return
}
let touch = recognizer.location(in:sceneView)
let hitTestResults = sceneView.hitTest(touch, types: .estimatedHorizontalPlane)
if (hitTestResults.first != nil) && self.sceneView.scene.rootNode.childNode(withName: "Man", recursively: true) == nil
{
self.sceneView.scene.rootNode.addChildNode(bodyNode!)
let alert = UIAlertController(title: "Start Game", message: "Center Body In Front of the Screen and Press 'Start'", preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "Start", style: UIAlertActionStyle.default, handler: { (alert: UIAlertAction!) in
let moveToMouth = SCNAction.move(by: SCNVector3(0,0,8), duration: 8)
bodyNode.runAction(moveToMouth)
}))
self.present(alert, animated: true, completion: nil)
}
}
@objc func pinched(recognizer: UIPinchGestureRecognizer) {
if recognizer.state == .changed {
guard let sceneView = recognizer.view as? ARSCNView else{
return
}
let touch = recognizer.location(in:sceneView)
let hitTestResults = self.sceneView.hitTest(touch, options: nil)
if let hitTest = hitTestResults.first {
let DSNode = self.sceneView.scene.rootNode.childNode(withName: "Man", recursively: true)!
let pinchScaleX = Float(recognizer.scale) * DSNode.scale.x
let pinchScaleY = Float(recognizer.scale) * DSNode.scale.y
let pinchScaleZ = Float(recognizer.scale) * DSNode.scale.z
DSNode.scale = SCNVector3(pinchScaleX, pinchScaleY, pinchScaleZ)
}
}
}
}