UIApplication app = UIApplication.SharedApplication;
if (UIApplication.SharedApplication.CanOpenUrl(new NSUrl("myapp://"))) { // do something if the custom URL scheme is supported }This code checks whether a custom URL scheme ("myapp://" in this case) is supported by the app and performs an action accordingly. The package library for the UIApplication class is part of the iOS SDK, which is included with Xcode on macOS.