hi,我想从字符串时间发出本地通知,我希望通知在给定时间之前10分钟启动。我在如何将时间从4:01转换为3:51时遇到麻烦,请帮忙。这是我的代码
let a = "4:01"
func startNoftification(prayer: String) {
let time = prayer.split(separator: ":").map { (x) -> Int in
return Int(String(x))!
}
let content = UNMutableNotificationContent()
content.title = "Adzan"
content.body = "it's time to sholat dzuhur"
let gregorian = Calendar(identifier: .gregorian)
var component = gregorian.dateComponents([.year, .month, .day, .hour, .minute, .second], from: Date())
component.hour = time[0]
component.minute = time[1] - 10
guard let date = gregorian.date(from: component) else { return }
let triggerDaily = Calendar.current.dateComponents([.hour, .minute, .second], from: date)
let trigger = UNCalendarNotificationTrigger(dateMatching: triggerDaily, repeats: true)
let request = UNNotificationRequest(identifier: "Hijrah", content: content, trigger: trigger)
UNUserNotificationCenter.current().add(request) { (error) in
if let err = error {
print("Notif error:", err)
return
}
}
}
答案 0 :(得分:3)
这是您需要的吗?
let time = "4:01"
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "hh:mm"
guard let date = dateFormatter.date(from: time) else {
return
}
let targetTime = Date(timeInterval: -(10 * 60), since: date) // Change time interval to required value in seconds
let targetTimeString = dateFormatter.string(from: targetTime)
print(targetTimeString) // Prints 3:51
或者,如果您的倒计时时间包含很多时间,请使用DateComponents
。
var dateComponents = DateComponents()
dateComponents.minute = -10
// Other components
if let targetTime = Calendar.current.date(byAdding: dateComponents, to: date)
print(dateFormatter.string(from: targetTime))
}
答案 1 :(得分:0)
在这里,我将解决方案与rakesha Shastri的答案相结合,希望它可以对其他人有所帮助。
首先在appDelegate和您的控制器中导入UserNotification
import UserNotification
并为didFinishWithLaunchingWithOptions添加代码
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge]) { (granted, error) in
if let err = error {
print("Notifications permission denied because:", err)
return
}
if granted {
print("Notifications permission granted.")
}
}
}
您可以创建一个函数并从API或任意字符串添加字符串时间参数,因为我没有使用函数,所以我在viewDidLoad中传递了解决方案
let adzan = "4:01"
let content = UNMutableNotificationContent()
content.title = "Adzan"
content.body = "It's time for sholat"
content.sound = UNNotificationSound.default
// Format the date first from string time
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "HH:mm"
//addingTimeInterval is where you want to set notification before or after deciding time in this case I set it 10 minute before deciding time
guard let date = dateFormatter.date(from: adzan)?.addingTimeInterval(-600) else { return }
// and convert our date into dateComponents
let triggerDate = Calendar.current.dateComponents([.hour, .minute, .second], from: date)
let trigger = UNCalendarNotificationTrigger(dateMatching: triggerDate, repeats: true)
let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
UNUserNotificationCenter.current().add(request)