If I create a BGContinuedProcessingTaskRequest, register it, and then "do work" within it appropriately reporting progress, and before my task has finished doing all the work it had to do, its expirationHandler triggers...
does the task later try again?
Or does it lose the execution opportunity until the app is next re-launched to the foreground?
In my testing, I never saw my task execute again once expired (which suggests the latter?).
I was able to easily force this expiry by starting my task, backgrounding my app, then launching the iOS Camera App. My example is just using test code inspired from https://developer.apple.com/documentation/backgroundtasks/performing-long-running-tasks-on-ios-and-ipados
let request = BGContinuedProcessingTaskRequest(identifier: taskIdentifier, title: "Video Upload", subtitle: "Starting Upload")
request.strategy = .queue
BGTaskScheduler.shared.register(forTaskWithIdentifier: taskIdentifier, using: nil) { task in
guard let task = task as? BGContinuedProcessingTask else { return }
print("i am a good task")
var wasExpired = false
task.expirationHandler = {
wasExpired = true
}
let progress = task.progress
progress.totalUnitCount = 100
while !progress.isFinished && !wasExpired {
progress.completedUnitCount += 1
let formattedProgress = String(format: "%.2f", progress.fractionCompleted * 100)
task.updateTitle(task.title, subtitle: "Completed \(formattedProgress)%")
sleep(1)
}
if progress.isFinished {
print ("i was a good task")
task.setTaskCompleted(success: true)
} else {
print("i was not a good task")
task.setTaskCompleted(success: false)
}
}
try? BGTaskScheduler.shared.submit(request)
Apologies if this is clearly stated somewhere and I'm missing it.
