Invoke Platform Code

Invoking platform code is only supported on Wisej.NET Hybrid Local Applications.

In situations where Wisej.NET Hybrid doesn't provide any APIs for accessing specific platform APIs, you can write your own code to access the required platform APIs. This requires knowledge of Apple's iOS and MacCatalyst APIs, Google's Android APIs, and Microsoft's Windows App SDK APIs.

Platform code can be invoked from cross-platform code by using conditional compilation, or by using partial classes and partial methods.

Example Project

https://github.com/iceteagroup/wisej-hybrid-examples/tree/main/PlatformCode

Examples

Registering for remote notifications on iOS:

// register for remote notifications in a Wisej.NET button click.
private void button1_Click(object sender, System.EventArgs e)
{
#if IOS
	// execute code on iOS UI Thread.
	CoreFoundation.DispatchQueue.MainQueue.DispatchAsync(() =>
	{
		// register for remote notifications.
		UIKit.UIApplication.SharedApplication.RegisterForRemoteNotifications();
	});
#endif
}

Determining what type of biometrics are supported on the device:

private void button1_Click(object sender, System.EventArgs e)
{
#if IOS
	var context = new LocalAuthentication.LAContext();
	Foundation.NSError error = null;

	context.CanEvaluatePolicy(LocalAuthentication.LAPolicy.DeviceOwnerAuthenticationWithBiometrics, out error);

	if (error?.LocalizedDescription == null)
		AlertBox.Show(context.BiometryType.ToString());
	else
		AlertBox.Show(error?.LocalizedDescription);
#endif
}

You must also add the NSFaceIDUsageDescription key to the Info.plist file to use biometrics.

Further Reading

.NET MAUI invoking platform code - .NET MAUIMicrosoftLearn

Invoking Platform Code in .NET MAUI