Errors and Exceptions Respond to problem situations in your interactions with APIs, and fine-tune your app for better debugging. TopicsUser-Relevant ErrorsErrorNSErrorLocalizedErrorRecoverableErrorCustomNSErrorAssertionsNSAssertionHandlerExceptionsNSExceptionDiagnostics and DebuggingNSLogv(_:_:)NSLog(_:_:) See AlsoApp SupportTask ManagementResourcesNotificationsApp Extension SupportScripting Support