Reverse Engineering iOS to Fix SDK Crashes

A recent issue in the Sentry Cocoa SDK was triggered by a change in iPadOS 26, where UIPrintPanelViewController began overriding the isKindOfClass: method to return true for UISplitViewController casts, despite not being a subclass. This unexpected behavior caused the SDK to crash when accessing non-existent methods, specifically when using the standard iOS UIPrintInteractionController with Sentry’s User Interaction Tracing enabled. The team investigated by analyzing Objective-C’s dynamic runtime and Apple's private frameworks, confirming the override of isKindOfClass: in UIPrintPanelViewController. The fix involved implementing a runtime check with respondsToSelector: to ensure the presence of the viewControllers method before access, thereby preventing further crashes. This solution, though not elegant, allowed for a quick release of a hotfix to address the issue.

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