blocks|key|4296605|text|考虑到你想要做什么并不完全清楚，我将根据我对你的问题的解释提供一个答案，我相信你的问题是问用户如何将带有SCNTextGeometry的SCNNode放置在用户指定的位置(点击位置)，然后定位或与其交互。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4296606|下面的代码是一个非常粗糙的示例，它允许用户在tapLocation中放置一个带有SCNTextGeometry的SCNNode。|4296607|然后，用户可以使用UIPinchGestureRecognizer缩放它或使用UIRotationGestureRecognizer旋转它。|4296608|您需要在tapGestureRecognizer中设置currentNode，但它应该为您指明正确的方向。|4296609|所有的代码都有完整的注释，所以应该很有意义：|4296610|class+ViewController:+UIViewController+{

++++//1.+Create+A+Reference+To+Our+ARSCNView+In+Our+Storyboard+Which+Displays+The+Camera+Feed
++++@IBOutlet+weak+var+augmentedRealityView:+ARSCNView!

++++//2.+Create+Our+ARWorld+Tracking+Configuration
++++let+configuration+=+ARWorldTrackingConfiguration()

++++//3.+Create+Our+Session
++++let+augmentedRealitySession+=+ARSession()

++++//4.+Create+A+Variable+To+Store+The+Current+Nodes+Rotation+Around+It's+Y-Axis
++++var+currentAngleY:+Float+=+0.0
++++var+isRotating+=+false
++++var+currentNode:+SCNNode?

++++//--------------------
++++//MARK:+View+LifeCycle
++++//--------------------

++++override+func+viewDidLoad()+{
++++++++super.viewDidLoad()

++++++++//1.+Run+The+ARSession
++++++++augmentedRealityView.session+=+augmentedRealitySession
++++++++augmentedRealitySession.run(configuration,+options:+[.resetTracking,+.removeExistingAnchors])

++++++++//2.+Add+A+UIPinchGestureRecognizer+So+We+Can+Scale+Our+TextNode
++++++++let+scaleGesture+=+UIPinchGestureRecognizer(target:+self,+action:+#selector(scaleCurrentNode(_:)))
++++++++self.view.addGestureRecognizer(scaleGesture)

++++++++//3.+Add+A+Tap+Gesture+Recogizer+So+We+Can+Place+Our+TextNode
++++++++let+tapGesture+=+UITapGestureRecognizer(target:+self,+action:+#selector(placeOrAssignNode(_:)))
++++++++self.view.addGestureRecognizer(tapGesture)

++++++++//4.+Add+A+Rotation+Gesture+Recogizer+So+We+Can+Rotate+Our+TextNode
++++++++let+rotateGesture+=+UIRotationGestureRecognizer(target:+self,+action:+#selector(rotateNode(_:)))
++++++++self.view.addGestureRecognizer(rotateGesture)
++++}

++++override+func+didReceiveMemoryWarning()+{+super.didReceiveMemoryWarning()+}

++++//-----------------------
++++//MARK:+Touch+Interaction
++++//-----------------------

++++///+Performs+An+ARHitTest+Or+SCNHitTest+So+We+Can+Place+Or+Assign+Our+TextNode
++++///
++++///+-+Parameter+gesture:+UITapGestureRecognizer
++++@objc+func+placeOrAssignNode(_+gesture:+UITapGestureRecognizer){

++++++++//1.+Get+The+Current+Location+Of+The+Tap
++++++++let+currentTouchLocation+=+gesture.location(in:+self.augmentedRealityView)

++++++++//2.+If+We+Hit+An+SCNNode+Set+It+As+The+Current+Node+So+We+Can+Interact+With+It
++++++++if+let+nodeHitTest+=+self.augmentedRealityView.hitTest(currentTouchLocation,+options:+nil).first?.node{

++++++++++++currentNode+=+nodeHitTest
++++++++++++return
++++++++}

++++++++//3.+Do+An+ARHitTest+For+Features+Points+So+We+Can+Place+An+SCNNode
++++++++if+let+hitTest+=+self.augmentedRealityView.hitTest(currentTouchLocation,+types:+.featurePoint).first+{

++++++++++++//4.+Get+The+World+Transform
++++++++++++let+hitTestPosition+=+hitTest.worldTransform.columns.3

++++++++++++//5.+Add+The+TestNode+At+The+Desired+Position
++++++++++++createTextFromPosition(SCNVector3(hitTestPosition.x,+hitTestPosition.y,+hitTestPosition.z))
++++++++++++return

++++++++}

++++}

++++//-------------------
++++//MARK:+Node+Creation
++++//-------------------

++++///+Creates+An+SCNNode+With+An+SCNTextGeometry
++++///
++++///+-+Parameter+position:+SCNVector3
++++func+createTextFromPosition(_+position:+SCNVector3){

++++++++let+textNode+=+SCNNode()

++++++++//1.+Create+The+Text+Geometry+With+String+&+Depth+Parameters
++++++++let+textGeometry+=+SCNText(string:+"StackOverFlow"+,+extrusionDepth:+1)

++++++++//2.+Set+The+Font+With+Our+Set+Font+&+Size
++++++++textGeometry.font+=+UIFont(name:+"Helvatica",+size:+1)

++++++++//3.+Set+The+Flatness+To+Zero+(This+Makes+The+Text+Look+Smoother)
++++++++textGeometry.flatness+=+0

++++++++//4.+Set+The+Colour+Of+The+Text
++++++++textGeometry.firstMaterial?.diffuse.contents+=+UIColor.white

++++++++//5.+Set+The+Text's+Material
++++++++textNode.geometry+=+textGeometry

++++++++//6.+Set+The+Pivot+At+The+Center
++++++++let+min+=+textNode.boundingBox.min
++++++++let+max+=+textNode.boundingBox.max

++++++++textNode.pivot+=+SCNMatrix4MakeTranslation(
++++++++++++min.x+%2B+(max.x+-+min.x)/2,
++++++++++++min.y+%2B+(max.y+-+min.y)/2,
++++++++++++min.z+%2B+(max.z+-+min.z)/2
++++++++)

++++++++//7.+Scale+The+Text+So+We+Can+Actually+See+It!
++++++++textNode.scale+=+SCNVector3(0.005,+0.005+,+0.005)

++++++++//8.+Add+It+To+The+Hierachy+&+Position+It
++++++++self.augmentedRealityView.scene.rootNode.addChildNode(textNode)
++++++++textNode.position+=+position

++++++++//9.+Set+It+As+The+Current+Node
++++++++currentNode+=+textNode
++++}


++++//-------------
++++//MARK:+Scaling
++++//-------------

++++///+Scales+The+Currently+Selected+Node
++++///
++++///+-+Parameter+gesture:+UIPinchGestureRecognizer
++++@objc+func+scaleCurrentNode(_+gesture:+UIPinchGestureRecognizer)+{

++++++++if+!isRotating,+let+selectedNode+=+currentNode{

++++++++++++if+gesture.state+==+.changed+{

++++++++++++++++let+pinchScaleX:+CGFloat+=+gesture.scale+*+CGFloat((selectedNode.scale.x))
++++++++++++++++let+pinchScaleY:+CGFloat+=+gesture.scale+*+CGFloat((selectedNode.scale.y))
++++++++++++++++let+pinchScaleZ:+CGFloat+=+gesture.scale+*+CGFloat((selectedNode.scale.z))
++++++++++++++++selectedNode.scale+=+SCNVector3Make(Float(pinchScaleX),+Float(pinchScaleY),+Float(pinchScaleZ))
++++++++++++++++gesture.scale+=+1

++++++++++++}

++++++++++++if+gesture.state+==+.ended+{}
++++++++}
++++}

++++//----------------
++++//MARK:+Rotation
++++//----------------

++++///+Rotates+The+Currently+Selected+Node+Around+It's+YAxis
++++///
++++///+-+Parameter+gesture:+UIRotationGestureRecognizer
++++@objc+func+rotateNode(_+gesture:+UIRotationGestureRecognizer){

++++++++if+let+selectedNode+=+currentNode{

++++++++++++//1.+Get+The+Current+Rotation+From+The+Gesture
++++++++++++let+rotation+=+Float(gesture.rotation)

++++++++++++//2.+If+The+Gesture+State+Has+Changed+Set+The+Nodes+EulerAngles.y
++++++++++++if+gesture.state+==+.changed{
++++++++++++++++isRotating+=+true
++++++++++++++++selectedNode.eulerAngles.y+=+currentAngleY+%2B+rotation
++++++++++++}

++++++++++++//3.+If+The+Gesture+Has+Ended+Store+The+Last+Angle+Of+The+CurrentNode
++++++++++++if(gesture.state+==+.ended)+{
++++++++++++++++currentAngleY+=+selectedNode.eulerAngles.y
++++++++++++++++isRotating+=+false
++++++++++++}
++++++++}

++++}
}|code-block|syntax|javascript|4296611|希望这能帮上忙。|4296612|entityMap^0|1G|F|1W|7|0|14|F|1K|7|0|9|O|13|R|0|4|K|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|L|3|M|5|6|7|1E|8|@]|D|@]|E|$]]|$1|N|3|O|5|P|7|1F|8|@]|D|@]|E|$Q|R]]|$1|S|3|T|5|6|7|1G|8|@]|D|@]|E|$]]|$1|U|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]]|V|$]]

Seeing as its not entirely clear as to what you want to do, I will provide an answer based on my interpretation of your question, which I believe is asking how a user can place an <code>SCNNode</code> with an <code>SCNTextGeometry</code> at a user specified position e.g. (a tapped location), and then position or interact with it.

The code below, is a very crude example which allows the user to place an <code>SCNNode</code> with an <code>SCNTextGeometry</code> at a tapLocation.

The user can then scale it using a <code>UIPinchGestureRecognizer</code> or rotate it using a <code>UIRotationGestureRecognizer</code>.

You will need to work on setting the currentNode in the <code>tapGestureRecognizer</code>, but it should point you in the right direction.

All the code is fully commented so should make perfect sense:

<pre><code>class ViewController: UIViewController {

 //1. Create A Reference To Our ARSCNView In Our Storyboard Which Displays The Camera Feed
 @IBOutlet weak var augmentedRealityView: ARSCNView!

 //2. Create Our ARWorld Tracking Configuration
 let configuration = ARWorldTrackingConfiguration()

 //3. Create Our Session
 let augmentedRealitySession = ARSession()

 //4. Create A Variable To Store The Current Nodes Rotation Around It's Y-Axis
 var currentAngleY: Float = 0.0
 var isRotating = false
 var currentNode: SCNNode?

 //--------------------
 //MARK: View LifeCycle
 //--------------------

 override func viewDidLoad() {
 super.viewDidLoad()

 //1. Run The ARSession
 augmentedRealityView.session = augmentedRealitySession
 augmentedRealitySession.run(configuration, options: [.resetTracking, .removeExistingAnchors])

 //2. Add A UIPinchGestureRecognizer So We Can Scale Our TextNode
 let scaleGesture = UIPinchGestureRecognizer(target: self, action: #selector(scaleCurrentNode(_:)))
 self.view.addGestureRecognizer(scaleGesture)

 //3. Add A Tap Gesture Recogizer So We Can Place Our TextNode
 let tapGesture = UITapGestureRecognizer(target: self, action: #selector(placeOrAssignNode(_:)))
 self.view.addGestureRecognizer(tapGesture)

 //4. Add A Rotation Gesture Recogizer So We Can Rotate Our TextNode
 let rotateGesture = UIRotationGestureRecognizer(target: self, action: #selector(rotateNode(_:)))
 self.view.addGestureRecognizer(rotateGesture)
 }

 override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() }

 //-----------------------
 //MARK: Touch Interaction
 //-----------------------

 /// Performs An ARHitTest Or SCNHitTest So We Can Place Or Assign Our TextNode
 ///
 /// - Parameter gesture: UITapGestureRecognizer
 @objc func placeOrAssignNode(_ gesture: UITapGestureRecognizer){

 //1. Get The Current Location Of The Tap
 let currentTouchLocation = gesture.location(in: self.augmentedRealityView)

 //2. If We Hit An SCNNode Set It As The Current Node So We Can Interact With It
 if let nodeHitTest = self.augmentedRealityView.hitTest(currentTouchLocation, options: nil).first?.node{

 currentNode = nodeHitTest
 return
 }

 //3. Do An ARHitTest For Features Points So We Can Place An SCNNode
 if let hitTest = self.augmentedRealityView.hitTest(currentTouchLocation, types: .featurePoint).first {

 //4. Get The World Transform
 let hitTestPosition = hitTest.worldTransform.columns.3

 //5. Add The TestNode At The Desired Position
 createTextFromPosition(SCNVector3(hitTestPosition.x, hitTestPosition.y, hitTestPosition.z))
 return

 }

 }

 //-------------------
 //MARK: Node Creation
 //-------------------

 /// Creates An SCNNode With An SCNTextGeometry
 ///
 /// - Parameter position: SCNVector3
 func createTextFromPosition(_ position: SCNVector3){

 let textNode = SCNNode()

 //1. Create The Text Geometry With String &amp; Depth Parameters
 let textGeometry = SCNText(string: "StackOverFlow" , extrusionDepth: 1)

 //2. Set The Font With Our Set Font &amp; Size
 textGeometry.font = UIFont(name: "Helvatica", size: 1)

 //3. Set The Flatness To Zero (This Makes The Text Look Smoother)
 textGeometry.flatness = 0

 //4. Set The Colour Of The Text
 textGeometry.firstMaterial?.diffuse.contents = UIColor.white

 //5. Set The Text's Material
 textNode.geometry = textGeometry

 //6. Set The Pivot At The Center
 let min = textNode.boundingBox.min
 let max = textNode.boundingBox.max

 textNode.pivot = SCNMatrix4MakeTranslation(
 min.x + (max.x - min.x)/2,
 min.y + (max.y - min.y)/2,
 min.z + (max.z - min.z)/2
 )

 //7. Scale The Text So We Can Actually See It!
 textNode.scale = SCNVector3(0.005, 0.005 , 0.005)

 //8. Add It To The Hierachy &amp; Position It
 self.augmentedRealityView.scene.rootNode.addChildNode(textNode)
 textNode.position = position

 //9. Set It As The Current Node
 currentNode = textNode
 }


 //-------------
 //MARK: Scaling
 //-------------

 /// Scales The Currently Selected Node
 ///
 /// - Parameter gesture: UIPinchGestureRecognizer
 @objc func scaleCurrentNode(_ gesture: UIPinchGestureRecognizer) {

 if !isRotating, let selectedNode = currentNode{

 if gesture.state == .changed {

 let pinchScaleX: CGFloat = gesture.scale * CGFloat((selectedNode.scale.x))
 let pinchScaleY: CGFloat = gesture.scale * CGFloat((selectedNode.scale.y))
 let pinchScaleZ: CGFloat = gesture.scale * CGFloat((selectedNode.scale.z))
 selectedNode.scale = SCNVector3Make(Float(pinchScaleX), Float(pinchScaleY), Float(pinchScaleZ))
 gesture.scale = 1

 }

 if gesture.state == .ended {}
 }
 }

 //----------------
 //MARK: Rotation
 //----------------

 /// Rotates The Currently Selected Node Around It's YAxis
 ///
 /// - Parameter gesture: UIRotationGestureRecognizer
 @objc func rotateNode(_ gesture: UIRotationGestureRecognizer){

 if let selectedNode = currentNode{

 //1. Get The Current Rotation From The Gesture
 let rotation = Float(gesture.rotation)

 //2. If The Gesture State Has Changed Set The Nodes EulerAngles.y
 if gesture.state == .changed{
 isRotating = true
 selectedNode.eulerAngles.y = currentAngleY + rotation
 }

 //3. If The Gesture Has Ended Store The Last Angle Of The CurrentNode
 if(gesture.state == .ended) {
 currentAngleY = selectedNode.eulerAngles.y
 isRotating = false
 }
 }

 }
}
</code></pre>

Hope it helps...

The code below just positions the text randomonly in a view. I would like the user to be able to point and then position the text in the way they would choose. 
<a href="https://i.stack.imgur.com/TDqJr.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TDqJr.png" alt="enter image description here"></a>

how to point and position arkit text

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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下面的代码只是在视图中随机定位文本。我希望用户能够指向，然后在他们选择的方式定位文本。​

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