SwiftUI 中日期选择器的用户自定义通知时间

Posted 2023-05-07

【中文标题】SwiftUI 中日期选择器的用户自定义通知时间

【英文标题】：user customized notification time from date picker in SwiftUI

【发布时间】：2020-09-24 02:11:28

【问题描述】：

这就是我到目前为止所拥有的，一个显示小时和分钟的选择器，以及一个每天下午 2 点发出的通知，我正在尝试绑定它们，以便用户可以手动选择他们想要通知的时间出发，将时间转换为 24 小时格式并放入 ->

 dateComponents.hour = 14
 dateComponents.minute = 00

这是我只显示时间的选择器代码：

import UserNotifications
import SwiftUI

struct Calendar: View 

    @State private var didTap:Bool = false
    @State var alert = false
    @State private var currentDate = Date()
    @Environment(\.presentationMode) var presentationMode
    @State private var isdateshowing = false
    @State private var textfield = ""

   var body: some View 

    List 



        Section 
             TextField("Choose at when you would like to be reminded", text: $textfield, onEditingChanged: 
                 edit in

                 if edit 
                     self.isdateshowing = true
                  else 
                     self.isdateshowing = false
                 
             )
        if isdateshowing 

            DatePicker(selection: .constant(Date()), displayedComponents: .hourAndMinute, label:  Text("Time") )

    

        

这是一个按钮，既可以请求发送每日通知的权限，也可以启用它，

        Section 
Button(action: 
    UNUserNotificationCenter.current()
        .requestAuthorization(options: [.alert, .sound, .badge])  (status, _) in
    if status

        let content = UNMutableNotificationContent()
        content.title = "It Is Time!"
        content.body = "LETS DO THIS!"
         content.sound = UNNotificationSound.default

        var dateComponents = DateComponents()
        dateComponents.hour = 14
            dateComponents.minute = 00


     //   let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 5, repeats: false)

        let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: true)
        let request = UNNotificationRequest(identifier: "noti", content: content, trigger: trigger)
        UNUserNotificationCenter.current().add(request, withCompletionHandler: nil)
        return
    
    self.alert.toggle()

    
) 
    Text("Press to Enable Daily Notifications")

    .alert(isPresented: $alert) 
            return Alert(title: Text("Please Enable Notification Access from Settings Pannel !!"))
                
            



        
    

struct Calendar_Previews: PreviewProvider 
    static var previews: some View 
        Calendar()
    

【参考方案1】：

尝试这样的事情（未经测试）：

在您的日历视图中添加：

@State var selectedTime = Date()

并改变：

DatePicker(selection: self.$selectedTime), displayedComponents: .hourAndMinute, label:  Text("Time") )

编辑

在不知道您真正想要达到的目标的情况下，我的建议是；尝试将您的代码分解为单个元素，例如：

func sendNotification() 
    let content = UNMutableNotificationContent()
    content.title = "It Is Time!"
    content.body = "LETS DO THIS!"
    content.sound = UNNotificationSound.default

    if let thisHour = Calendar.current.dateComponents([.hour], from: Date()).hour,
        let selectedHour = Calendar.current.dateComponents([.hour], from: self.selectedTime).hour 
        // Note, this sends the notification at the selectedHour or later
        if (thisHour >= selectedHour) 
            var dateComponents = DateComponents()
            dateComponents.hour = selectedHour
            dateComponents.minute = 0

            let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: true)
            let request = UNNotificationRequest(identifier: "noti", content: content, trigger: trigger)
            UNUserNotificationCenter.current().add(request, withCompletionHandler: nil)
        
    

然后在您请求许可的部分：

    Section 
        Button(action: 
            UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge])  (status, _) in
                if status 
                    self.sendNotification()
                 else 
                    self.alert.toggle()
                
            
        ) 
            Text("Press to Enable Daily Notifications")
        .alert(isPresented: $alert) 
            Alert(title: Text("Please Enable Notification Access from Settings Pannel !!"))
        
    

【讨论】：

非常感谢您的建议，很抱歉打扰您，但我对 SwiftUI 很陌生。我真的不确定将最后一部分放在通知部分的哪个位置，它不断给我错误（类型 hour 和 current 在代码中没有成员）。你会怎么做才能解决它？

我已经更新了我的答案。我不知道你为什么在小时和电流方面有错误。您需要出示您的代码。