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This post describes a macOS 26 UI tweak that enforces consistent window corner radii across third-party apps using Objective-C method swizzling.
•macOS 26 introduced inconsistent window corner rounding, which the author finds more annoying than the roundness itself
•The common workaround of disabling SIP (System Integrity Protection) to edit system app libraries carries security trade-offs
•The author's approach is to make corners consistently rounded rather than consistently sharp, by forking an existing solution
•A dynamic library is written in Objective-C that swizzles NSThemeFrame methods (_cornerRadius, _getCachedWindowCornerRadius, _topCornerSize, _bottomCornerSize) to return a fixed radius of 23.0
•The dylib is compiled for arm64e and x86_64, code-signed, and injected via DYLD_INSERT_LIBRARIES set through a LaunchAgent plist
This summary was automatically generated by AI based on the original article and may not be fully accurate.
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Apple
Smashing Magazine