我正在使用 BGTaskScheduler API 在我的 iOS 14 应用程序中注册后台任务,该应用程序使用新应用程序作为 @Main
而不是 AppDelegate
.我以为我们要使用 scenePhase
如下所示,以模仿 AppDelegate 中 didFinishLaunching 的先前功能,但以下会导致崩溃:*** Assertion failure in -[BGTaskScheduler _unsafe_registerForTaskWithIdentifier:usingQueue:launchHandler:], BGTaskScheduler.m:185 2020-12-01 12:53:40.645091-0500 newFitnessApp[13487:1952133] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'All launch handlers must be registered before application finishes launching'
如何实现BGTaskScheduler?
@main
struct newFitnessAppApp: App {
@Environment(\.scenePhase) var scenePhase
//Launch Count (for requesting reviews and to show tutorial)
//var launchCount = UserDefaults.standard.integer(forKey: TrackerConstants.launchCountKey)
//var testMode = true
//@Environment(\.scenePhase) private var phase
let trackerDataStore = TrackerDataStore(workoutLoader: HealthKitWorkoutLoader())
var body: some Scene {
WindowGroup {
AppRootView().environmentObject(trackerDataStore)
}
.onChange(of: scenePhase) { newScenePhase in
switch newScenePhase {
case .active:
print("App is active")
registerBackgroundTasks()
最佳答案
尝试在init
中执行
@main
struct newFitnessAppApp: App {
init() {
registerBackgroundTasks()
}
// ... other code
}
或使用 AppDelegate 适配器在委托(delegate)回调中执行此操作 https://stackoverflow.com/a/62538373/12299030
关于ios - 将 BGTaskScheduler API 与新的 iOS 14 应用程序结合使用。如何在没有 AppDelegate 的情况下注册任务?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/65096278/