[英]How to do timeIntervalSinceNow in Swift3?
我正在發布通知並觀看教程,當我輸入時:
notification.fireDate = NSDate(timeIntervalSinceNow: 0)
它說
參數標簽'(timeIntervalSinceNow :)'與任何可用的重載都不匹配
我該如何解決? 這是我的代碼:
import UIKit
import UserNotifications
class ViewController: UIViewController {
var timer = Timer()
var time = 10
override func viewDidLoad() {
super.viewDidLoad()
timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: Selector(("Notification")), userInfo: nil, repeats: true)
// Do any additional setup after loading the view, typically from a nib.
}
func notification() {
time -= 1
if time <= 0 {
let notification = UILocalNotification()
notification.alertAction = "Call"
notification.alertBody = "You have a call right now"
notification.fireDate = NSDate(timeIntervalSinceNow: 0)
UIApplication.shared.scheduleLocalNotification(notification)
timer.invalidate()
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func pushNotification(_ sender: AnyObject) {
let AlertView = UIAlertController(title: "Time for your call!", message: "Press go to continue", preferredStyle: .alert)
AlertView.addAction(UIAlertAction(title: "Go", style: .default, handler: nil))
self.present(AlertView, animated: true, completion: nil)
}
}
斯威夫特3
let minute:TimeInterval = 11.0 * 60.0;
Date(timeIntervalSinceNow: minute);
到現在為+11分鍾。
如果您想要現在的開火日期,它只是:
notification.fireDate = Date()
正如Leo在別處指出的那樣,選擇器是不正確的。 它應該是:
weak var timer: Timer?
var time = 10
override func viewDidLoad() {
super.viewDidLoad()
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(handleTimer(_:)), userInfo: nil, repeats: true)
}
func handleTimer(_ timer: Timer) {
time -= 1
if time <= 0 {
let notification = UILocalNotification()
notification.alertAction = "Call"
notification.alertBody = "You have a call right now"
notification.fireDate = Date()
UIApplication.shared.scheduleLocalNotification(notification)
timer.invalidate()
}
}
然后你問:
這肯定有效,但現在我離開應用程序時沒有得到通知
當您離開應用程序時,您不會收到通知,因為當應用程序未運行時, Timer
不會繼續觸發。 最好完全取消計時器,並立即安排本地通知所需的時間。 例如,要在10秒內安排本地通知:
override func viewDidLoad() {
super.viewDidLoad()
scheduleLocalNotification(delay: 10)
}
func scheduleLocalNotification(delay: TimeInterval) {
let notification = UILocalNotification()
notification.alertAction = "Call"
notification.alertBody = "You have a call right now"
notification.fireDate = Date().addingTimeInterval(delay)
UIApplication.shared.scheduleLocalNotification(notification)
}
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