Learn about changes to the iOS SDK.
The Apple Developer Program provides everything you need to build and distribute your apps on the App Store for iPhone and iPad. Membership includes access to beta OS releases, advanced app capabilities, and tools to develop, test, and distribute apps and Safari extensions. For more information, visit Apple Developer Program.
For issues not mentioned in release notes, file bugs through Apple Bug Reporter.
When filing a bug, please include the full version number in the bug title and in the description. This looks like “12 (16Axxxx).” You can find the full version number in Settings > General > About > Version.