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如果按下開始按鈕,我的通知將繼續每隔30秒關閉一次。我想這樣做是爲了每當用戶點擊開始按鈕時,倒計時都會被重置,並且通知只會在按下開始按鈕後的30秒內出現。因此,如果用戶在30秒內無限次地點擊開始按鈕,用戶將永遠看不到通知。如何延遲/去抖通知定時器(swift3)
import UIKit
import UserNotifications
class ViewController: UIViewController,UNUserNotificationCenterDelegate {
var isGrantedAccess = false
private var timer = Timer()
func startTimer(){
let timeInterval = 30.0
if isGrantedAccess && !timer.isValid { //allowed notification and timer off
timer = Timer.scheduledTimer(withTimeInterval: timeInterval, repeats: true, block: { (timer) in
self.sendNotification()
})}}
func stopTimer(){
//shut down timer
timer.invalidate()
//clear out any pending and delivered notifications
UNUserNotificationCenter.current().removeAllPendingNotificationRequests()
UNUserNotificationCenter.current().removeAllDeliveredNotifications()
}
func sendNotification(){
if isGrantedAccess{
let content = UNMutableNotificationContent()
content.title = "HIIT Timer"
content.body = "30 Seconds Elapsed"
content.sound = UNNotificationSound.default()
content.categoryIdentifier = "timer.category"
let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 0.001, repeats: false)
let request = UNNotificationRequest(identifier: "timer.request", content: content, trigger: trigger)
UNUserNotificationCenter.current().add(request) { (error) in
if let error = error{
print("Error posting notification:\(error.localizedDescription)")
}}}}
@IBAction func startButton(_ sender: UIButton) {
startTimer()
}
func timeString(time:TimeInterval) -> String {
let minutes = Int(time)/60 % 60
let seconds = Int(time) % 60
return String(format: " %02i : %02i", minutes, seconds)
}
override func viewDidLoad() {
super.viewDidLoad()
UNUserNotificationCenter.current().delegate = self
UNUserNotificationCenter.current().requestAuthorization(options: [.alert,.sound]) { (granted, error) in
self.isGrantedAccess = granted
}
let stopAction = UNNotificationAction(identifier: "stop.action", title: "Stop", options: [])
let timerCategory = UNNotificationCategory(identifier: "timer.category", actions: [stopAction], intentIdentifiers: [], options: [])
UNUserNotificationCenter.current().setNotificationCategories([timerCategory])
}
func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping() -> Void) {
if response.actionIdentifier == "stop.action"{
stopTimer()
}
completionHandler()
}
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
completionHandler([.alert,.sound])
}}
這工作。我不敢相信這很簡單。看起來在編碼過度的情況下它是常態 –