Function not called with selector action - swift

Question

I'm trying to handle tap gesture in an external UIViewController's class but my function was never called. Here is my
code:
import SceneKit
import UIKit
class SceneManager
{
private let assetFolder: String
private let mainCamera: SCNNode
private let view: SCNView
private let scene: SCNScene
init(view: SCNView, assetFolder: String, sceneFile: String, mainCameraName: String, backgroundColor: UIColor) {
self.assetFolder = assetFolder
self.scene = SCNScene(named: (self.assetFolder + "/scene/" + sceneFile))!
self.mainCamera = self.scene.rootNode.childNodeWithName(mainCameraName, recursively: true)!
self.view = view
self.view.backgroundColor = backgroundColor
self.view.allowsCameraControl = false
self.view.pointOfView = self.mainCamera
self.view.scene = self.scene
//PROBLEM BELOW
let gesture = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
self.view.addGestureRecognizer(gesture)
}
#objc func handleTap(sender: UITapGestureRecognizer) {
print("hello")
}
}
Here is my ViewController Class :
import UIKit
import QuartzCore
import SceneKit
class ViewController: UIViewController
{
override func viewDidLoad()
{
super.viewDidLoad()
let view = self.view as! SCNView
view.showsStatistics = true
_ = SceneManager(view: view, assetFolder: "art.scnassets", sceneFile: "EURO_COPTER.dae", mainCameraName: "camera", backgroundColor: UIColor.blackColor())
}
}
If someone has an idea. Thanks in advance.

Answer 1

Try following code it may help
let gesture = UITapGestureRecognizer(target: self, action: #selector(SceneManager.handleTap(_:)))

Answer 2

Try to this way:-
When you declare your class, add UIGestureRecognizerDelegate after the class it subclasses. Here's what that looks like in my case:
let gesture = UITapGestureRecognizer(target: self, action: #selector(self.handleTap(_:)))
self.view.userInteractionEnabled = true;
gesture.delegate = self
self.view.addGestureRecognizer(gesture)