Dear Apple Developer Support,
I am reporting a critical bug in iOS 26.0 that affects the entire system's keyboard functionality and device performance.
Issue Description: When a UIInputView is displayed and a new ViewController is presented, the UIInputView loses focus and disappears. After the presented ViewController is dismissed, the UIInputView regains focus and reappears. However, in this specific scenario, the app becomes completely unresponsive without any error logs or crashes.
Critical System Impact:
- The device becomes sluggish and performance degrades significantly
- Other apps' keyboard functionality is completely broken - text fields cannot activate keyboards
- This is a system-level issue that persists even after the affected app is terminated
- Device performance remains degraded until restart
Technical Details:
- The issue appears to be related to First Responder chain corruption during UIInputView focus transitions
- No crashes or error logs are generated, making it difficult to debug
- The problem affects the entire iOS keyboard subsystem, not just the specific app
- This suggests a potential memory leak or resource management issue at the system level
Version Information:
- iOS Version: 26.0
- Previous versions: No such issues reported
- Affected devices: Multiple devices tested
Evidence of System-Level Bug: The fact that other apps' keyboard functionality is affected and device performance degrades system-wide strongly indicates this is an iOS 26.0 system bug rather than an application-specific issue. The First Responder chain corruption appears to be preventing proper cleanup of keyboard-related resources.
This issue is blocking production releases and requires urgent attention as it affects the core iOS keyboard functionality.
Thank you for your prompt attention to this critical issue.
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