BackgroundTasks iOS 12.4 to 13.0 API Differences

Added #def BG_EXTERN

Added BGTask

Added BGTask.identifier

Added BGTask.expirationHandler

Added -[BGTask setTaskCompletedWithSuccess:]

Added BGProcessingTask

Added BGAppRefreshTask

Added BGTaskRequest

Added BGTaskRequest.identifier

Added BGTaskRequest.earliestBeginDate

Added BGAppRefreshTaskRequest

Added -[BGAppRefreshTaskRequest initWithIdentifier:]

Added BGProcessingTaskRequest

Added -[BGProcessingTaskRequest initWithIdentifier:]

Added BGProcessingTaskRequest.requiresNetworkConnectivity

Added BGProcessingTaskRequest.requiresExternalPower

Added BGTaskSchedulerErrorDomain

Added BGTaskSchedulerErrorCode

Added BGTaskSchedulerErrorCodeUnavailable

Added BGTaskSchedulerErrorCodeTooManyPendingTaskRequests

Added BGTaskSchedulerErrorCodeNotPermitted

Added BGTaskScheduler

Added BGTaskScheduler.sharedScheduler

Added -[BGTaskScheduler registerForTaskWithIdentifier:usingQueue:launchHandler:]

Added -[BGTaskScheduler submitTaskRequest:error:]

Added -[BGTaskScheduler cancelTaskRequestWithIdentifier:]

Added -[BGTaskScheduler cancelAllTaskRequests]

Added -[BGTaskScheduler getPendingTaskRequestsWithCompletionHandler:]