Я создал тест push-уведомлений. Я создал код, который, когда приложение переходит в фоновый режим, каждые 10 секунд приложение показывает локальное push-уведомление. Код работает хорошо через несколько минут. Через несколько минут работа над фоном прекращается. Я думаю, что через какое-то время iOS убила работу, работающую в фоновом режиме. Это? Есть ли способ, которым iOS не останавливает мою работу в фоновом режиме?
Это мой код: ViewController:
import UIKit
class ViewController: UIViewController {
var timer = NSTimer()
var backgroundTaskIdentifier: UIBackgroundTaskIdentifier?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
notificatioAppGoToBackground()
setupNotificationSettings()
//call handle notifications
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ViewController.handleModifyListNotification), name: "modifyListNotification", object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ViewController.handleDeleteListNotification), name: "deleteListNotification", object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ViewController.handleStopTimerNotification), name: "stopTimer", object: nil)
backgroundTaskIdentifier = UIApplication.sharedApplication().beginBackgroundTaskWithExpirationHandler({
UIApplication.sharedApplication().endBackgroundTask(self.backgroundTaskIdentifier!)
})
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func alert(title:String, message:String ){
let alert = UIAlertController(title: title, message: message, preferredStyle: .Alert)
alert.addAction(UIAlertAction(title: "OK", style: .Default) { _ in })
self.presentViewController(alert, animated: true){}
}
func handleStopTimerNotification(){
timer.invalidate()
print("acao foreground")
UIApplication.sharedApplication().cancelAllLocalNotifications() //cancela a notificacao
}
func handleModifyListNotification() {
timer.invalidate()
print("acao editar")
//alert("Atenção", message: "Modificação ativada, notificação cancelada")
UIApplication.sharedApplication().cancelAllLocalNotifications() //cancela a notificacao
}
func handleDeleteListNotification() {
print("executou a exclusao")
}
func setupNotificationSettings() {
let notificationSettings: UIUserNotificationSettings! = UIApplication.sharedApplication().currentUserNotificationSettings()
if (notificationSettings.types == UIUserNotificationType.None){
let notificationTypes: UIUserNotificationType = [.Alert, .Sound, .Badge]
let modifyListAction = UIMutableUserNotificationAction()
modifyListAction.identifier = "editList"
modifyListAction.title = "Edit list"
modifyListAction.activationMode = UIUserNotificationActivationMode.Foreground
modifyListAction.destructive = false
modifyListAction.authenticationRequired = true
let trashAction = UIMutableUserNotificationAction()
trashAction.identifier = "trashAction"
trashAction.title = "Delete list"
trashAction.activationMode = UIUserNotificationActivationMode.Background
trashAction.destructive = true
trashAction.authenticationRequired = true
let actionsArray = NSArray(objects: modifyListAction, trashAction)
let actionsArrayMinimal = NSArray(objects: trashAction, modifyListAction)
// Specify the category related to the above actions.
let shoppingListReminderCategory = UIMutableUserNotificationCategory()
shoppingListReminderCategory.identifier = "shoppingListReminderCategory"
shoppingListReminderCategory.setActions(actionsArray as? [UIUserNotificationAction], forContext: UIUserNotificationActionContext.Default)
shoppingListReminderCategory.setActions(actionsArrayMinimal as? [UIUserNotificationAction], forContext: UIUserNotificationActionContext.Minimal)
let categoriesForSettings = NSSet(objects: shoppingListReminderCategory)
// Register the notification settings.
let newNotificationSettings = UIUserNotificationSettings(forTypes: notificationTypes, categories: categoriesForSettings as? Set<UIUserNotificationCategory>)
UIApplication.sharedApplication().registerUserNotificationSettings(newNotificationSettings)
}
}
func setActions(actions: [AnyObject]!, forContext context: UIUserNotificationActionContext){}
func notificatioAppGoToBackground(){
let notificationCenter = NSNotificationCenter.defaultCenter()
notificationCenter.addObserver(self, selector: #selector(appMovedToBackground), name: UIApplicationWillResignActiveNotification, object: nil)
}
func appMovedToBackground() {
print("App moved to background!!!")
listenerSchedule()
}
func listenerSchedule() {
timer = NSTimer.scheduledTimerWithTimeInterval(10.0, target: self, selector: #selector(ViewController.startNotication), userInfo: nil, repeats: true)
}
func startNotication(){
let date = NSDate()
let dateComponets: NSDateComponents = NSCalendar.currentCalendar().components([.Day, .Month, .Year, .Hour, .Minute, .Second], fromDate: date)
if(dateComponets.second < 20){
print("nao notifica \(dateComponets.second)" )
}else{
print("aguardando notificação \(dateComponets.second)" )
let localNotification = UILocalNotification()
localNotification.alertBody = "Teste de notificação"
localNotification.alertAction = "View List"
localNotification.category = "shoppingListReminderCategory"
localNotification.applicationIconBadgeNumber = dateComponets.second
localNotification.soundName = UILocalNotificationDefaultSoundName
UIApplication.sharedApplication().scheduleLocalNotification(localNotification)
}
}
}
AppDelegate:
import UIKit
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
return true
}
func application(application: UIApplication, didRegisterUserNotificationSettings notificationSettings: UIUserNotificationSettings) {
print(notificationSettings.types.rawValue)
}
//executa a noficacao agendada com a app aberta
func application(application: UIApplication, didReceiveLocalNotification notification: UILocalNotification) {
// Do something serious in a real app.
print("Received Local Notification:")
print(notification.alertBody!)
application.applicationIconBadgeNumber = 0 //limpa o badge ao carregar a app
application.cancelAllLocalNotifications() //limpa o badge ao carregar a app
NSNotificationCenter.defaultCenter().postNotificationName("stopTimer", object: nil)
}
//Essa funcao exibe a notificacao quando a app esta parada ou em segundo plano
func application(application: UIApplication, handleActionWithIdentifier identifier: String?, forLocalNotification notification: UILocalNotification, completionHandler: () -> Void) {
if identifier == "editList" {
NSNotificationCenter.defaultCenter().postNotificationName("modifyListNotification", object: nil)
}
else if identifier == "trashAction" {
NSNotificationCenter.defaultCenter().postNotificationName("deleteListNotification", object: nil)
}
completionHandler()
}
func applicationWillResignActive(application: UIApplication) {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}
func applicationDidEnterBackground(application: UIApplication) {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
func applicationWillEnterForeground(application: UIApplication) {
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}
func applicationDidBecomeActive(application: UIApplication) {
NSNotificationCenter.defaultCenter().postNotificationName("stopTimer", object: nil)
application.applicationIconBadgeNumber = 0 //limpa o badge ao carregar a app
application.cancelAllLocalNotifications() //limpa o badge ao carregar a app
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
func applicationWillTerminate(application: UIApplication) {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
}
