Let a nav-data download survive leaving the app - #40
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The consent screen asked the pilot to leave the app open until the import finished, because a plain Task gets seconds of runtime once the app is backgrounded and the transfer would restart from nothing next launch. A BGContinuedProcessingTask buys that time, and gives the system a progress and cancel affordance the app does not have to draw. This was blocked, and is not any more. The system expires these tasks as conditions change, and cancels them outright when the app is swiped out of the switcher, without telling the app. Against an import that emptied the live dataset before writing its replacement, that meant an empty airport database — the state the app cannot work from. An import now writes a generation nothing is reading, so a cancelled one costs a file that the next launch reclaims. The task is an enhancement, not a dependency: if the system will not start one, the import runs exactly as it did before. The request asks to start now or not at all rather than queue, because an import would rather run unprotected than wait to begin. One fixed identifier is registered and submitted, advertised verbatim in BGTaskSchedulerPermittedIdentifiers. A wildcard entry there permits the concrete identifiers beneath it, but the wildcard itself is not one the scheduler will register a handler for; since a handler has to be registered while launching, the identifier it answers for has to be known by then, and naming each submission after its own import is not open to us. No UIBackgroundModes entry is involved; that belongs to app refresh, and the comment claiming otherwise was describing BGProcessingTask, a different API for unattended work that is still its own piece of work. Progress is reported because it is required, not merely useful: a task the system reads as stalled is expired to reclaim its resources. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01471376Uhug2TYZN8RDFGtq
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The consent screen asked the pilot to leave the app open until the import
finished, because a plain Task gets seconds of runtime once the app is
backgrounded and the transfer would restart from nothing next launch. A
BGContinuedProcessingTask buys that time, and gives the system a progress
and cancel affordance the app does not have to draw.
This was blocked, and is not any more. The system expires these tasks as
conditions change, and cancels them outright when the app is swiped out
of the switcher, without telling the app. Against an import that emptied
the live dataset before writing its replacement, that meant an empty
airport database — the state the app cannot work from. An import now
writes a generation nothing is reading, so a cancelled one costs a file
that the next launch reclaims.
The task is an enhancement, not a dependency: if the system will not
start one, the import runs exactly as it did before. The request asks to
start now or not at all rather than queue, because an import would rather
run unprotected than wait to begin.
The identifier is a wildcard prefix, which is how continued-processing
requests are permitted — the prefix is registered and each submission
names itself beneath it. No UIBackgroundModes entry is involved; that
belongs to app refresh, and the comment claiming otherwise was describing
BGProcessingTask, a different API for unattended work that is still its
own piece of work.
Progress is reported because it is required, not merely useful: a task
the system reads as stalled is expired to reclaim its resources.
Co-Authored-By: Claude Opus 5 (1M context) noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_01471376Uhug2TYZN8RDFGtq
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https://claude.ai/code/session_01471376Uhug2TYZN8RDFGtq