[MessageUI] Update bindings up to Xcode 27.0 Beta 3 by dalexsoto · Pull Request #26180 · dotnet/macios

dalexsoto · 2026-07-17T23:54:33Z

Summary

Bind MFMailDraft, including its properties and full initializer, for iOS and Mac Catalyst.
Bind MFComposeAssistantViewController and its required delegate protocol.
Keep native initialization paths that create invalid state or abort non-public, while exposing initWithDelegate: as the supported initializer.
Mirror Apple’s header by leaving initWithDelegate: without designated-initializer metadata, and narrowly exempt the inherited UIViewController initializer that aborts at runtime.
Remove the resolved MessageUI xtro todo files.

Validation

make world
Clean xtro generation/classification: sanity passed with no MessageUI unclassified entries
Clean Cecil suite: passed
Focused iOS 27 constructor introspection: designated-initializer check passed; only unrelated existing UIBarMinimization default-constructor failure remains
Focused Mac Catalyst constructor introspection: 3/3 passed
Mac Catalyst full introspection: 39/39 passed; macOS full introspection: 32/32 passed
Full iOS/tvOS introspection completed with no MessageUI failures; remaining failures are unrelated Xcode 27 beta runtime gaps in UIKit, AVKit, and AVFoundation
Clean AppSizeTest: 0 failures; all 16 cases skipped by the beta-Xcode guard

Bind MFMailDraft and MFComposeAssistantViewController for iOS and Mac Catalyst. Model the draft properties, initializer, compose-assistant delegate, and required callback with Xcode 27 availability and nullability. Hide native initialization paths that produce invalid state or abort, and identify initWithDelegate: as the valid designated initializer. Remove the resolved xtro todo files and document the SDK-header/runtime mismatch for the designated initializer. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 153b8939-99d0-4969-9178-e1f2fc5ce69a

Copilot

Pull request overview

Updates the MessageUI bindings to align with Xcode 27.0 Beta 3 by adding new types/APIs and adjusting test expectations in xtro annotations to reflect a designated-initializer mismatch between headers and runtime behavior.

Changes:

Added bindings for MFMailDraft, MFComposeAssistantViewController, and MFComposeAssistantViewControllerDelegate (iOS/Mac Catalyst 27.0).
Hid unsafe initialization paths for MFComposeAssistantViewController and exposed initWithDelegate: as the designated initializer.
Removed resolved MessageUI xtro .todo files and added .ignore entries documenting/acknowledging the header vs runtime designated-initializer discrepancy.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/xtro-sharpie/api-annotations-dotnet/MacCatalyst-MessageUI.todo	Removed resolved xtro TODO entries after bindings were added.
tests/xtro-sharpie/api-annotations-dotnet/MacCatalyst-MessageUI.ignore	Added ignore entry (and rationale) for the designated-initializer mismatch reported by xtro.
tests/xtro-sharpie/api-annotations-dotnet/iOS-MessageUI.todo	Removed resolved xtro TODO entries after bindings were added.
tests/xtro-sharpie/api-annotations-dotnet/iOS-MessageUI.ignore	Added ignore entry (and rationale) for the designated-initializer mismatch reported by xtro.
src/messageui.cs	Introduced new MessageUI bindings for Xcode 27.0 APIs and adjusted initialization semantics.

dalexsoto · 2026-07-18T05:19:14Z

/azp run

azure-pipelines · 2026-07-18T05:19:41Z

Azure Pipelines: Successfully started running 3 pipeline(s).

dalexsoto · 2026-07-18T08:49:27Z

/azp run xamarin-macios-sim-pr-tests

azure-pipelines · 2026-07-18T08:49:45Z

Azure Pipelines: Successfully started running 1 pipeline(s).

Remove the designated-initializer attribute from MFComposeAssistantViewController.initWithDelegate: because the Xcode header does not annotate it. Drop the corresponding xtro exceptions and add a narrow introspection match for the inherited UIViewController initializer that aborts at runtime. Keep the invalid generated initialization paths non-public. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Copilot-Session: 153b8939-99d0-4969-9178-e1f2fc5ce69a

dalexsoto · 2026-07-20T22:25:42Z

/azp run xamarin-macios-sim-pr-tests

azure-pipelines · 2026-07-20T22:25:59Z

Azure Pipelines: Successfully started running 1 pipeline(s).

dalexsoto · 2026-07-20T22:42:53Z

/azp run xamarin-macios-pr-apidiff

azure-pipelines · 2026-07-20T22:43:05Z

Azure Pipelines: Successfully started running 1 pipeline(s).

vs-mobiletools-engineering-service2 · 2026-07-21T00:54:12Z

✅ API diff for current PR / commit

NET (empty diffs)

iOS: vsdrops gist ( No breaking changes )
tvOS: vsdrops gist ( No breaking changes )
MacCatalyst: vsdrops gist ( No breaking changes )
macOS: vsdrops gist ( No breaking changes )

✅ API diff vs stable

NET (empty diffs)

iOS: vsdrops gist ( No breaking changes )
tvOS: vsdrops gist ( No breaking changes )
MacCatalyst: vsdrops gist ( No breaking changes )
macOS: vsdrops gist ( No breaking changes )

ℹ️ Generator diff

Generator Diff: vsdrops (html) vsdrops (raw diff) gist (raw diff) - Please review changes)

Pipeline on Agent
Hash: 897e85a4b8e8e206c57ea59a7b0c3088abf18e15 [PR build]

dalexsoto · 2026-07-21T03:13:15Z

/azp run xamarin-macios-sim-pr-tests

azure-pipelines · 2026-07-21T03:13:33Z

Azure Pipelines: Successfully started running 1 pipeline(s).

dalexsoto · 2026-07-21T09:20:56Z

/azp run xamarin-macios-sim-pr-tests

azure-pipelines · 2026-07-21T09:21:15Z

Azure Pipelines: Successfully started running 1 pipeline(s).

rolfbjarne · 2026-07-21T12:15:53Z

+	/// <summary>Provides an interface for composing an email draft.</summary>
+	[NoTV, NoMac, iOS (27, 0), MacCatalyst (27, 0)]
+	[BaseType (typeof (UIViewController))]
+	[PrivateDefaultCtor] // init and initWithCoder: abort at runtime


Why not just [DisableDefaultCtor]?

[DisableDefaultCtor] only suppresses the generated parameterless init. Because UIViewController conforms to NSCoding, bgen separately emits .ctor(NSCoder) and leaves it public under [DisableDefaultCtor]. On the Xcode 27 Beta 3 runtime, both initWithCoder: and initWithNibName:bundle: unconditionally trap; only initWithDelegate: works. [PrivateDefaultCtor] is intentional so the generated init and .ctor(NSCoder) stay non-public, while the narrow introspection match avoids re-exposing the trapping nib initializer. I verified this against the generated iOS/Mac Catalyst sources and the Beta 3 runtime implementation. There is no separate bgen attribute to suppress only the NSCoder constructor.

vs-mobiletools-engineering-service2 · 2026-07-22T02:36:39Z

🚀 [CI Build #897e85a] Test results 🚀

Test results

✅ All tests passed on VSTS: test results.

🎉 All 195 tests passed 🎉

Tests counts

✅ assembly-processing: All 1 tests passed. Html Report (VSDrops) Download
✅ cecil: All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (iOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (MacCatalyst): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (macOS): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (Multiple platforms): All 1 tests passed. Html Report (VSDrops) Download
✅ dotnettests (tvOS): All 1 tests passed. [attempt 2] Html Report (VSDrops) Download
✅ framework: All 2 tests passed. Html Report (VSDrops) Download
✅ fsharp: All 4 tests passed. Html Report (VSDrops) Download
✅ generator: All 5 tests passed. Html Report (VSDrops) Download
✅ interdependent-binding-projects: All 4 tests passed. Html Report (VSDrops) Download
✅ introspection: All 6 tests passed. Html Report (VSDrops) Download
✅ linker (iOS): All 15 tests passed. Html Report (VSDrops) Download
✅ linker (MacCatalyst): All 15 tests passed. Html Report (VSDrops) Download
✅ linker (macOS): All 21 tests passed. Html Report (VSDrops) Download
✅ linker (tvOS): All 15 tests passed. Html Report (VSDrops) Download
✅ monotouch (iOS): All 19 tests passed. [attempt 4] Html Report (VSDrops) Download
✅ monotouch (MacCatalyst): All 18 tests passed. [attempt 2] Html Report (VSDrops) Download
✅ monotouch (macOS): All 19 tests passed. Html Report (VSDrops) Download
✅ monotouch (tvOS): All 19 tests passed. Html Report (VSDrops) Download
✅ msbuild: All 2 tests passed. Html Report (VSDrops) Download
✅ sharpie: All 1 tests passed. Html Report (VSDrops) Download
✅ windows: All 3 tests passed. Html Report (VSDrops) Download
✅ xcframework: All 4 tests passed. Html Report (VSDrops) Download
✅ xtro: All 1 tests passed. Html Report (VSDrops) Download

macOS tests

✅ Tests on macOS Sonoma (14): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Sequoia (15): All 5 tests passed. Html Report (VSDrops) Download
✅ Tests on macOS Tahoe (26): All 5 tests passed. Html Report (VSDrops) Download
⚠️ Tests on macOS Golden Gate (27): Tests skipped, incorrect beta version. Html Report (VSDrops) Download

Linux Build Verification

✅ Linux build succeeded

Pipeline on Agent
Hash: 897e85a4b8e8e206c57ea59a7b0c3088abf18e15 [PR build]

Copilot AI review requested due to automatic review settings July 17, 2026 23:54

dalexsoto added this to the xcode27 milestone Jul 17, 2026

dalexsoto added the copilot label Jul 17, 2026

dalexsoto requested a review from rolfbjarne July 17, 2026 23:54

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dalexsoto enabled auto-merge (squash) July 18, 2026 21:05

rolfbjarne requested changes Jul 20, 2026

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Comment thread tests/xtro-sharpie/api-annotations-dotnet/iOS-MessageUI.ignore Outdated

rolfbjarne mentioned this pull request Jul 20, 2026

[CI] Infrastructure: VSM-XAM-03.Tahoe.arm64 persistent 'Clean for remote tests' failure #26190

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This was referenced Jul 21, 2026

[CI] Infrastructure: Provisionator blob storage failures on July 20 #26191

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[CI] Provisionator Xcode downloads at ~160 KB/s hit the 180-minute job limit #26212

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dalexsoto requested a review from rolfbjarne July 21, 2026 14:58

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dalexsoto merged commit cf6ff84 into xcode27.0 Jul 22, 2026
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dalexsoto deleted the dev/alex/xc27-MessageUI branch July 22, 2026 02:37

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vs-mobiletools-engineering-service2 commented Jul 21, 2026

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vs-mobiletools-engineering-service2 commented Jul 22, 2026

🚀 [CI Build #897e85a] Test results 🚀

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dalexsoto commented Jul 17, 2026 •

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