Memory leak when using Event handlers

[georgepedrosa]

I created a demo app to try to drag and scale shapes using onPan and onPinch events on a rectangle Node. The app has a large background image inside a scroll view, and the macaw view has the same size as the image view. I want to create a rectangle shape over the image, and be able to drag and resize it, but I noticed some memory leak every time I activate an event, crashing the app after some time. I downsized the application to the following lines and it's still retaining memory, though much less. I'm using version 0.9.5. What could be the cause? Is the memory leak normal?

import UIKit
import Macaw

class ViewController: UIViewController {
    
    var macawView = MacawView()
    
    let stroke = Stroke(fill: Color.red, width: 1.0)
    var group: Group!
    override func viewDidLoad() {
        super.viewDidLoad()
        configMacawView()
        
        let square = Shape(form: Rect(x: 0, y: 0, w: 80.0, h: 120.0), fill: Color.clear, stroke: stroke)
        
        square.onPan { event in
            square.place = square.place.move(dx: event.dx, dy: event.dy)
        }
        
        macawView.node = square
        
    }
    
    func configMacawView(){
        let imageView = UIImageView()
        let image = #imageLiteral(resourceName: "Medical_X-Ray_imaging_AAR02_nevit")
        imageView.image = image
        imageView.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(imageView)
        
        imageView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        imageView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
        imageView.widthAnchor.constraint(equalTo:view.widthAnchor).isActive = true
        imageView.heightAnchor.constraint(equalTo:view.heightAnchor).isActive = true
        
        macawView.backgroundColor = .clear
        macawView.translatesAutoresizingMaskIntoConstraints = false
        self.view.addSubview(macawView)
        
        macawView.centerXAnchor.constraint(equalTo: imageView.centerXAnchor).isActive = true
        macawView.centerYAnchor.constraint(equalTo: imageView.centerYAnchor).isActive = true
        macawView.widthAnchor.constraint(equalTo:imageView.widthAnchor).isActive = true
        macawView.heightAnchor.constraint(equalTo:imageView.heightAnchor).isActive = true
    }
}

[ystrot]

Hi @georgepedrosa,

Thanks for reporting! The fix available in the master branch and will be part of the next release.