.NET MAUI 9.0 preview version increased MacCatalyst minimum version to 15.0(macOS 12.0 Monterey)

[tounaobun]

Description

We are planning to migrate from .NET MAUI 8.0 to 9.0. Our project support MacCatalyst 14.0 and above. However, when we change SDK from 8.0 to 9.0. The compiler tells that I must upgrade from 14.0 to 15.0. I am curious why this happens, does SDK include some new features? Does 9.0 plan to include MacCatalyst 14.0 when officially released? Thanks.

Public API Changes

`
14.0

15.0
`

Intended Use-Case

..

[jfversluis]

This seems to originate from a level deeper than .NET MAUI, on the .NET for iOS layer and was merged here. Can't really see what the exact reason for it is. @rolfbjarne?

[rolfbjarne]

I am curious why this happens

It's because Mac Catalyst 14.0 = macOS 11.0, and Apple doesn't support macOS 11.0 anymore: https://endoflife.date/macos

See also:

• Bump iOS/tvOS minimum supported version to 12.2 runtime#91736
• Release notes: .NET 8 supported macOS versions are inconsistent core#9038

[jfversluis]

That clears it up, thanks!

Was checking to see if our templates need updating because of this change, but that happened here: #21011

[tounaobun]

Thanks, @rolfbjarne. I know that Apple maintains a major version for around three years, but that doesn't stop users from using older versions(Like macOS 11.0). It might no be a good reason to bump into macOS12.0( MacCatalyst 15.0 ) , since our project will lose users who's mac book is running under macOS 12.0.

[tounaobun]

The reason that we eagerly plan to move to .NET MAUI 9.0 is that 9.0 resolves plenty of bug fixes and improvements. And we hope we could still build our project using a minimum version of MacCatalyst 13.1 ( macOS 10.15 Catalina ).