[jokerlin]

Problem

VSSubscription is unavailable on Mac Catalyst in the Xcode 27 SDK, so the hook_setCurrentSubscription: parameter type fails to build.

Fix

Type the argument as id. The hook ignores its argument, so runtime behaviour is unchanged.

Split out of #240.

[TheMoonThatRises]

Should the swizzle hook be runtime restricted to versions below 18.0 since setCurrentSubscription is also deprecated?

[jokerlin]

I tested calling -[VSSubscriptionRegistrationCenter setCurrentSubscription:] at runtime under Mac Catalyst on macOS 27.0.1 (26A434) with Xcode 27.0 (27A266a, target arm64-apple-ios18.0-macabi). Even though the API is marked deprecated in iOS 18 headers, the class and selector still exist in VideoSubscriberAccount.framework at runtime, and invoking setCurrentSubscription: without the restricted entitlement throws an Objective-C NSException.

In a small test harness that wraps the call in @try / @catch to log the exception (Caught exception: below):

2026-10-21 22:30:19.236 test_vss[99470:13768961] Class: VSSubscriptionRegistrationCenter
2026-10-21 22:30:19.237 test_vss[99470:13768961] Center: <VSSubscriptionRegistrationCenter: 0x1009068e0>
2026-10-21 22:30:19.237 test_vss[99470:13768961] IMP: 0x1db8c031c
2026-10-21 22:30:19.237 test_vss[99470:13768961] Caught exception: The -[VSSubscriptionRegistrationCenter setCurrentSubscription:] method requires an entitlement.

In a real app where callers don't wrap setCurrentSubscription: in @try / @catch, that exception goes uncaught and crashes the process. Since PlayCover runs pre-compiled iOS IPAs (which may still call setCurrentSubscription: regardless of the host macOS/Catalyst version) with entitlements stripped/re-signed, restricting the swizzle to < 18.0 would cause those apps to crash on macOS 27.0.1. So keeping the no-op swizzle unconditional on all OS versions seems safer.