jackxujh’s Profile | Apple Developer Forums

Reply to app crashes with EXC_CRASH (SIGABRT), when manually launched on device with Debug build

Wow, thank you eskimo, that is really helpful!I opened the console, and it turned out that the log did is different from the crash report.Here is what I got:*** Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named MTKView because no class named MTKView was found; the class needs to be defined in source code or linked in from a library (ensure the class is part of the correct target)'Now that is kind of odd. Because if during attached debug run, it works, then why would MTKView not found during detached runs. I feel while this indicates that it is related to an instance of MTKView, it is more related to the app lifecycle, as how each items are initiated during the launch stage.Here is a excerpt of the view controller, which is derived from the GameViewController from the iOS Game template in Xcode.import UIKit import MetalKit class GameViewController: UIViewController { private var renderer: Renderer! // Renderer is a custom class that manages // renderings inside pathTracingView @IBOutlet weak var pathTracingView: MTKView! @IBOutlet weak var sceneTableView: UITableView! @IBOutlet weak var inspectorTableView: UITableView! // Other members... override func viewDidLoad() { super.viewDidLoad() guard let mtkView = pathTracingView else { print("View of Gameview controller is not an MTKView") return } // Select the device to render with. We choose the default device guard let defaultDevice = MTLCreateSystemDefaultDevice() else { print("Metal is not supported") return } mtkView.device = defaultDevice mtkView.backgroundColor = UIColor.black guard let newRenderer = Renderer(metalKitView: mtkView) else { print("Renderer cannot be initialized") return } renderer = newRenderer renderer.viewController = self renderer.view.isPaused = true sceneTableView.delegate = self sceneTableView.dataSource = self sceneTableView.reloadData() inspectorTableView.delegate = self inspectorTableView.dataSource = self inspectorTableView.reloadData() renderer.mtkView(mtkView, drawableSizeWillChange: mtkView.drawableSize) mtkView.delegate = renderer } // Other methods... }