little snippet for saving every frame in a scenekit render loop

saveframe.swift

            if !self.shouldRender {
                return
            }
            
            if self.imageCount == 4 * 60 {
                self.showGroupLogo(showBoolean: NSNumber.init(value: true))
            } else if self.imageCount == 6 * 60 {
                self.showGroupLogo(showBoolean: NSNumber.init(value: false))
            } else if self.imageCount == 10 * 60 {
                self.setErrorState(errorStateBoolean: NSNumber.init(value: true))
            } else if self.imageCount == 12 * 60 {
                self.setErrorState(errorStateBoolean: NSNumber.init(value: false))
            } else if self.imageCount == 16 * 60 {
                self.showNameLogo(showBoolean: NSNumber.init(value: true))
            } else if self.imageCount == 18 * 60 {
                self.showNameLogo(showBoolean: NSNumber.init(value: false))
            } else if self.imageCount == 22 * 60 {
                self.setErrorState(errorStateBoolean: NSNumber.init(value: true))
            } else if self.imageCount == 24 * 60 {
                self.setErrorState(errorStateBoolean: NSNumber.init(value: false))
            } else if self.imageCount == 28 * 60 {
                self.setSilent1State(silentStateBoolean: NSNumber.init(value: true))
            } else if self.imageCount == 30 * 60 {
                self.setSilent1State(silentStateBoolean: NSNumber.init(value: false))
            } else if self.imageCount == 32 * 60 {
                self.setSilent2State(silentStateBoolean: NSNumber.init(value: true))
            } else if self.imageCount == 34 * 60 {
                self.setSilent2State(silentStateBoolean: NSNumber.init(value: false))
            } else if self.imageCount == 36 * 60 {
                self.endItAll()
                self.shouldRender = false
            }
            
            if self.imageCount % 60 == 0 {
                print("time to render a second: \(Date.timeIntervalSinceReferenceDate - self.secondStart)")
                
                self.secondStart = Date.timeIntervalSinceReferenceDate
            }
            
            UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, self.view.isOpaque, 0.0)
            self.view.drawHierarchy(in: self.view.bounds, afterScreenUpdates: false)
            let snapshotImageFromMyView = UIGraphicsGetImageFromCurrentImageContext()
            UIGraphicsEndImageContext()
            
            if let image = snapshotImageFromMyView {
                if let data = UIImagePNGRepresentation(image) {
                    print("image \(self.imageCount)")
                    
                    let paths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)
                    let path = URL(fileURLWithPath: paths[0]).appendingPathComponent("\(self.imageCount).png")
                    do {
                        try data.write(to: path)
                    } catch {}
                }
            }

            self.imageCount += 1