从 DatePicker 设置时间以进行提醒

如何解决从 DatePicker 设置时间以进行提醒

Example（我尝试创建这样的东西。 现在你可以看到，这里你可以选择时间和间隔）

我创建了提醒，用户可以选择接收通知的频率（每 2 天、每 3 天等），但我也希望用户能够选择时间。我知道如何创建在选定时间发送通知的提醒，但我必须使用 UNCalendarNotificationTrigger，问题是我使用了 UNTimeIntervalNotificationTrigger。谢谢

@IBOutlet weak var picker: UIPickerView!
    
@IBOutlet weak var timePicker: UIDatePicker!

 @IBAction func setReminderBtnTapped(_ sender: Any) {
        
        let content = UNMutableNotificationContent()
        content.title = "Test"
        content.body = "Blablabla"
        content.sound = .default
        

        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: TimeInterval((picker.selectedRow(inComponent: 1)+1)*(24*3600)),repeats: true)
        let request = UNNotificationRequest(identifier: "blabla.reminder",content: content,trigger: trigger)
        
   
        UNUserNotificationCenter.current().add(request) { (error) in
            if let error = error {
                print("error")
            }
        }
        print("Notification added")
        
    }

解决方法

试试这个代码：

private func setLocalNotification(hour: Int,minute: Int,completionHandler: @escaping (Bool) -> Void) {
   
    let center = UNUserNotificationCenter.current()
    center.requestAuthorization(options: [.alert,.badge,.sound]) { [weak self] (granted,error) in
        guard let self = self else {
            return
        }
        
        let center = UNUserNotificationCenter.current()
        center.removeAllPendingNotificationRequests()
        
        guard error == nil else {
            completionHandler(false)
            return
        }
        
        if granted {
            
            let content = UNMutableNotificationContent()
            content.title = "title"
            content.sound = UNNotificationSound.default
            content.badge = 1
            
            var dateComponents = DateComponents()
            dateComponents.hour = hour
            dateComponents.minute = minute
            let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents,repeats: true)
            
            let request = UNNotificationRequest(identifier: UUID().uuidString,content: content,trigger: trigger)
            center.add(request)
            
            completionHandler(true)
            return
        }
        
        completionHandler(false)
    }
}

你可以像这样通过从 datePicker 获取日期来调用：

let date = self.timepPicker.date
let calendar = Calendar.current
   let hour = calendar.component(.hour,from: date) // get hour
let minutes = calendar.component(.minute,from: date) // get minute

self.setLocalNotification(hour: hour,minute: minutes) { [weak self] isSet in
    guard let self = self else {
        return
    }

    if !isSet {
        let center = UNUserNotificationCenter.current()
        center.removeAllPendingNotificationRequests() // remove previus notification
    }
}

更新答案 每 n 天重复 X 次：

create extension from date for create simple date getDateComponents:

extension Date {
    public func getDateComponents() -> DateComponents {
        let dateComponents = Calendar.current.dateComponents([.hour,.minute,.second,.day],from: self)
        
        return dateComponents
    }
}

并更新 setLocalNotification 函数：

private func setLocalNotification(repeatCount: Int,jumpNextDay: Int,hour: Int,minute: Int) {
        let center = UNUserNotificationCenter.current()
        center.requestAuthorization(options: [.alert,.sound]) { (granted,error) in
            let center = UNUserNotificationCenter.current()
            center.removeAllPendingNotificationRequests()
            
            guard error == nil else {
                return
            }
            
            if granted {
                
                let content = UNMutableNotificationContent()
                content.title = "title"
                content.sound = UNNotificationSound.default
                content.badge = 1
                
                // create date from hour and minute based on current
                let firstDate = Calendar.current.date(bySettingHour: hour,minute: minute,second: 0,of: Date())!
                
                let firstTimeInterval = firstDate.timeIntervalSince1970 // get timeInterval
                
                // example run for
                // repeat count 5 and jump 2
                // 2 4 6 8 10
                for i in stride(from: jumpNextDay,to: jumpNextDay * (repeatCount + 1),by: jumpNextDay) {

                    // create next day
                    // 86400 next time interval added to first time interval
                    
                    // create time interval from first date

                    // 2 next day = firstTimeInterval + 2 * 86400
                    
                    let timeIntervalForTrigger = firstTimeInterval + Double((i * 86400))
                    
                    // create date from time interval
                    let date = Date.init(timeIntervalSince1970: timeIntervalForTrigger)
                    
                    // create datecomponnet
                    let dateComponents = date.getDateComponents()
                    
                    let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents,repeats: false)

                    let request = UNNotificationRequest(identifier: UUID().uuidString,trigger: trigger)
                    center.add(request)
                }
            }
        }
    }

并调用：

let date = self.timepPicker.date
        let calendar = Calendar.current
           let hour = calendar.component(.hour,from: date) // get hour
        let minutes = calendar.component(.minute,from: date) // get minute

        self.setLocalNotification(repeatCount: 2,jumpNextDay: 2,hour: hour,minute: minutes)