After building the application, a crash occurs at the MacOS level when starting the application.

[TakaTeke]

I updated to macos_ui 2.0. And I built the application. The build completes normally, but a MacOS-level crash occurs when starting the app.

The RUN console displays the following message: ”Could not cast value of type 'my App.BlurryContainerViewController' (0x1046468b0) to 'FlutterViewController' (0x1098f2d20).”

It seems that the crash occurs during the "config.apply()" process in the following code. ”Future _configureMacosWindowUtils() async { MacosWindowUtilsConfig config = const MacosWindowUtilsConfig(); await config.apply(); }”

Even after updating to macos_ui2.02, the same crash occurs.

When I investigated, the contents of macos/Runner/MainFlutterWindow.swift file remained the same as when macos_ui 1.3.0 was used. There was a description of "class BlurryContainerViewController". (see macos_ui 1.3.0 https://pub.dev/packages/macos_ui/versions/1.3.0)

In another working application using macos_ui2.02, the contents of the macos/Runner/MainFlutterWindow.swift file were as follows:

”import Cocoa import FlutterMacOS

class MainFlutterWindow: NSWindow { override func awakeFromNib() { let flutterViewController = FlutterViewController.init() let windowFrame = self.frame self.contentViewController = flutterViewController self.setFrame(windowFrame, display: true)

 RegisterGeneratedPlugins(registry: flutterViewController)

 super.awakeFromNib()

} }”

When I replaced the MainFlutterWindow.swift file of the crashed application with the above code and built it, the crash did not occur.

Was my treatment good? Is there anything else I need to do? Please let me know.

[Adrian-Samoticha]

Yeah, 2.0.0 was a pretty major release which introduced breaking changes. The window is now no longer styled through modifications to the MainFlutterWindow.swift file, but instead relies on macos_window_utils, so make sure your MainFlutterWindow.swift file looks like this:

import Cocoa
import FlutterMacOS

class MainFlutterWindow: NSWindow {
  override func awakeFromNib() {
    let flutterViewController = FlutterViewController.init()
    let windowFrame = self.frame
    self.contentViewController = flutterViewController
    self.setFrame(windowFrame, display: true)

    RegisterGeneratedPlugins(registry: flutterViewController)

    super.awakeFromNib()
  }
}