Hello,
I'm currently experiencing an issue with the DeviceActivityMonitor extension in my code, specifically with the eventDidReachThreshold callback. I'm hoping to get some insights into why this problem occurs and how to resolve it.
Problem:
Issue 1: The eventDidReachThreshold callback is not triggering as expected. It appears that the callback is not being invoked when the threshold is reached.
Issue 2: After a few seconds, the eventDidReachThreshold callback starts to trigger multiple times. This unexpected behavior is causing problems in my code, as it results in incorrect actions being taken.
iOS version: iOS16.7.2 and iOS17.1
Xcode version: 15.0.1
Swift version: 5.9
Here is my code to start the monitoring:
func startMonitoring() {
var startTime : DateComponents = DateComponents(hour: 0, minute: 0)
let endTime : DateComponents = DateComponents(hour: 23, minute: 59)
/// Creates the schedule for the activity, specifying the start and end times, and setting it to repeat.
let schedule = DeviceActivitySchedule(intervalStart: startTime, intervalEnd: endTime, repeats: true, warningTime: nil)
/// Defines the event that should trigger the encouragement.
let event = DeviceActivityEvent(applications: socialActivitySelection.applicationTokens, categories: socialActivitySelection.categoryTokens, webDomains: socialActivitySelection.webDomainTokens, threshold: DateComponents(minute: 2))
let events: [DeviceActivityEvent.Name: DeviceActivityEvent] = [.socialScreenTimeEvent : event]
do {
activityCenter.stopMonitoring([.socialScreenTime])
/// Tries to start monitoring the activity using the specified schedule and events.
try activityCenter.startMonitoring(.socialScreenTime, during: schedule, events: events)
} catch {
/// Prints an error message if the activity could not be started.
print("Could not start monitoring: \(error)")
}
}
If there are any known workarounds or potential solutions, please share them.
Thank you for your help in resolving this problem.
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Swift Concurrency Resources:
Forums tags: Concurrency
The Swift Programming Language > Concurrency documentation
Migrating to Swift 6 documentation
WWDC 2022 Session 110351 Eliminate data races using Swift Concurrency — This ‘sailing on the sea of concurrency’ talk is a great introduction to the fundamentals.
WWDC 2021 Session 10134 Explore structured concurrency in Swift — The table that starts rolling out at around 25:45 is really helpful.
Swift Async Algorithms package
Swift Concurrency Proposal Index DevForum post
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Dispatch Resources:
Forums tags: Dispatch
Dispatch documentation — Note that the Swift API and C API, while generally aligned, are different in many details. Make sure you select the right language at the top of the page.
Dispatch man pages — While the standard Dispatch documentation is good, you can still find some great tidbits in the man pages. See Reading UNIX Manual Pages. Start by reading dispatch in section 3.
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WWDC 2017 Session 706 Modernizing Grand Central Dispatch Usage [1]
Avoid Dispatch Global Concurrent Queues forums post
Waiting for an Async Result in a Synchronous Function forums post
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