fix(ios): use minimal windowing control style on iPadOS 26

[velocitysystems]

Resolves tauri-apps/tauri#15521

Description

iPadOS 26 adds macOS-style system window controls to the top-left corner of every windowed scene. Because a Tao window hosts a fullscreen WKWebView with no native toolbar, these controls do not contribute to the safe area and float on top of, overlapping, the web content. There is no native toolbar for them to integrate with.

Fix

Implement UIWindowSceneDelegate's optional preferredWindowingControlStyle(for:) method on TaoSceneDelegate, returning the minimal style. The minimal style places the controls in a safe-area strip above the content instead of floating over it. This is the same approach taken by Flutter and Capacitor.

No runtime version check is needed: preferredWindowingControlStyleForScene: is an optional protocol method the system only sends on iPadOS 26+, and the UISceneWindowingControlStyle class is resolved lazily at call time. On earlier iOS versions the conformance is inert and nothing changes.

This also enables the UISceneWindowingControlStyle and UIWindowScene features on objc2-ui-kit and bumps the objc2 crate family 0.3.0 -> 0.3.2, since the UISceneWindowingControlStyle type does not exist in 0.3.0. The bump is patch-level and the macOS build is unaffected.

Testing

• cargo check --target aarch64-apple-ios -p tao compiles with no errors.
• cargo check -p tao (macOS host) still compiles, confirming the dependency bump does not regress the desktop build.
• Verified on iPadOS 26 on a physical device

Related

madsmtm/objc2#849

[github-actions]

Package Changes Through 118c980

There are 1 changes which include tao with minor

Planned Package Versions

The following package releases are the planned based on the context of changes in this pull request.

package	current	next
tao	0.35.3	0.36.0

Add another change file through the GitHub UI by following this link.

---

Read about change files or the docs at github.com/jbolda/covector

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	objc2-foundation@​0.3.0 ⏵ 0.3.2
	objc2-ui-kit@​0.3.0 ⏵ 0.3.2

View full report

[velocitysystems]

@FabianLars This now forces Tao to use the correct windowing mode on iOS 26 (and is compatible with iOS 27).
Can we get this into the next release? Thanks!

[FabianLars]

i have no means to test this atm but looks safe enough

[velocitysystems]

i have no means to test this atm but looks safe enough

I've verified this with local debug + release builds and a CI/CD build pushed to TestFlight.