在 iOS 的特定时间启动本地通知

Question

我正在尝试创建一个计时器，它会在用户设置的时间触发本地通知。我遇到的问题是我无法找到一种方法来将本地通知设置为在 7:00PM 时关闭。在研究这个问题时发现的几乎所有方法都涉及在从当前日期开始的特定时间发出本地通知。我试图让用户 select 7:00PM 然后让通知在那个时候消失。从逻辑上讲，这可以通过最终时间（select用户输入的值）-当前时间来实现，这会给您带来时差。然而，我并不完全确定该怎么做。

非常感谢有关该主题的任何帮助，谢谢。下面是我目前用来触发本地通知的代码。

let center = UNUserNotificationCenter.current()

content.title = storedMessage
content.body = "Drag down to reset or disable alarm"
content.categoryIdentifier = "alarm"
content.userInfo = ["customData": "fizzbuzz"]
content.sound = UNNotificationSound.init(named: "1.mp3")
content.badge = 1

let trigger = UNTimeIntervalNotificationTrigger(timeInterval: timeAmount, repeats: false)
let request = UNNotificationRequest(identifier: "requestAlarm", content: content, trigger: trigger)
    center.add(request)


center.delegate = self

Answer 1

试试这个

    let dateformateer = NSDateFormatter()
    dateformateer.timeStyle = .ShortStyle

    let notification = UILocalNotification()
    var datecomponent = NSDateComponents()

    datecomponent = NSCalendar.currentCalendar().components([NSCalendarUnit.Day,NSCalendarUnit.Month,NSCalendarUnit.Hour,NSCalendarUnit.Year, NSCalendarUnit.Minute],fromDate: Datepicker.date)


    var fixdate = NSDate()
    fixdate = NSCalendar.currentCalendar().dateFromComponents(datecomponent)!
    notification.fireDate = fixdate
    notification.alertTitle = "Title"
    notification.alertBody = "Body"
   UIApplication.sharedApplication().scheduleLocalNotification(notification)`

Answer 2

好的 iOS 10 Apple 已弃用 UILocalNotification，这意味着是时候熟悉新的通知框架了。

设置这是一个很长的 post 所以让我们从导入新的通知框架开始：

// Swift
import UserNotifications

// Objective-C (with modules enabled)
@import UserNotifications;

您通过共享的 UNUserNotificationCenter 管理通知 object:

// Swift
let center = UNUserNotificationCenter.current()

// Objective-C
UNUserNotificationCenter *center = [UNUserNotificationCenter currentNotificationCenter];

授权与旧的通知框架一样，您需要获得用户对您的应用程序将使用的通知类型的许可。在您的应用程序生命周期的早期提出请求，例如 application:didFinishLaunchingWithOptions:. 您的应用程序第一次请求授权时，系统会向用户显示警报，之后他们可以管理权限设置：

// Swift
let options: UNAuthorizationOptions = [.alert, .sound];

// Objective-C
UNAuthorizationOptions options = UNAuthorizationOptionAlert + UNAuthorizationOptionSound;

您使用共享通知中心发出实际授权请求：

// Swift
center.requestAuthorization(options: options) { (granted, error) in
    if !granted {
        print("Something went wrong")
    }
}

// Objective-C
[center requestAuthorizationWithOptions:options
completionHandler:^(BOOL granted, NSError * _Nullable error) {
if (!granted) {
NSLog(@"Something went wrong");
}
}];

框架使用布尔值调用完成处理程序，指示是否已授予访问权限和一个错误 object 如果没有发生错误，该错误将为 nil。

注意：用户可以随时更改您应用的通知设置。您可以使用 getNotificationSettings 检查允许的设置。这使用 UNNotificationSettings object 异步调用完成块，您可以使用它来检查授权状态或单独的通知设置：

 // Swift
 center.getNotificationSettings { (settings) in
     if settings.authorizationStatus != .authorized {
         // Notifications not allowed
     }
 }

 // Objective-C
 [center getNotificationSettingsWithCompletionHandler:^(UNNotificationSettings * _Nonnull settings) {
 if (settings.authorizationStatus != UNAuthorizationStatusAuthorized) {
// Notifications not allowed
 }
 }];

创建通知请求一个UNNotificationRequest通知请求包含内容和触发条件：

通知内容

通知的内容是 UNMutableNotificationContent 的一个实例，根据需要设置了以下属性：

标题：包含警报主要原因的字符串。

subtitle：包含警报副标题的字符串（如果需要）

body：包含警报消息文本的字符串

徽章：显示在应用程序图标上的数字。

声音：发出警报时播放的声音。使用 UNNotificationSound.default() 或从文件创建自定义声音。 launchImageName：如果您的应用响应通知而启动，则使用启动图像的名称。

userInfo：要在通知中传递的自定义信息的字典附件：一组 UNNotificationAttachment objects。用于包含音频、图像或视频内容。

请注意，在本地化标题等警告字符串时，最好使用 localizedUserNotificationString(forKey:arguments:)，它会延迟加载本地化，直到通知被发送。

一个简单的例子：

 // Swift
 let content = UNMutableNotificationContent()
 content.title = "Don't forget"
 content.body = "Buy some milk"
 content.sound = UNNotificationSound.default()

 // Objective-C
 UNMutableNotificationContent *content = [UNMutableNotificationContent new];
 content.title = @"Don't forget";
 content.body = @"Buy some milk";
 content.sound = [UNNotificationSound defaultSound];

通知触发器

根据时间、日历或位置触发通知。触发器可以重复：

时间间隔：安排几秒后的通知。例如五分钟后触发：

 // Swift
 let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 300, repeats: false)

 // Objective-C
 UNTimeIntervalNotificationTrigger *trigger =     [UNTimeIntervalNotificationTrigger triggerWithTimeInterval:300
                              repeats:NO];

日历：在特定日期和时间触发。触发器是使用日期组件 object 创建的，这使得某些重复间隔更容易。要将日期转换为其日期组件，请使用当前日历。例如：

 // Swift
 let date = Date(timeIntervalSinceNow: 3600)
 let triggerDate = Calendar.current.dateComponents([.year, .month, .day, .hour, .minute, .second], from: date)

 // Objective-C
 NSDate *date = [NSDate dateWithTimeIntervalSinceNow:3600];
 NSDateComponents *triggerDate = [[NSCalendar currentCalendar]   
          components:NSCalendarUnitYear +
          NSCalendarUnitMonth + NSCalendarUnitDay +
          NSCalendarUnitHour + NSCalendarUnitMinute +
          NSCalendarUnitSecond fromDate:date];

从日期组件创建触发器：

 // Swift
 let trigger = UNCalendarNotificationTrigger(dateMatching: triggerDate, repeats: false)

 // Objective-C
 UNCalendarNotificationTrigger *trigger = [UNCalendarNotificationTrigger triggerWithDateMatchingComponents:triggerDate
                                     repeats:NO];

要创建以特定时间间隔重复的触发器，请使用正确的日期组件集。例如，要让通知每天在同一时间重复，我们只需要小时、分钟和秒：

 let triggerDaily = Calendar.current.dateComponents([hour, .minute, .second], from: date)
 let trigger = UNCalendarNotificationTrigger(dateMatching: triggerDaily, repeats: true)

要使其每周同时重复，我们还需要工作日：

 let triggerWeekly = Calendar.current.dateComponents([.weekday, .hour, .minute, .second], from: date)
 let trigger = UNCalendarNotificationTrigger(dateMatching: triggerWeekly, repeats: true)

计划

准备好内容和触发器后，我们创建一个新的通知请求并将其添加到通知中心。每个通知请求都需要一个字符串标识符以供将来参考：

 // Swift
 let identifier = "UYLLocalNotification"
 let request = UNNotificationRequest(identifier: identifier, content: content, trigger: trigger)

 center.add(request, withCompletionHandler: { (error) in
     if let error = error {
         // Something went wrong
     }
 })

 // Objective-C
 NSString *identifier = @"UYLLocalNotification";
 UNNotificationRequest *request = [UNNotificationRequest requestWithIdentifier:identifier
                              content:content trigger:trigger]

 [center addNotificationRequest:request withCompletionHandler:^(NSError * _Nullable error) {
  if (error != nil) {
    NSLog(@"Something went wrong: %@",error);
  }
  }];

Answer 3

对于 Swift 您可以使用此代码：

  let calendar = Calendar.current
    let components = DateComponents(year: 2018, month: 05, day: 06, hour: 20, minute: 22) // Set the date here when you want Notification
    let date = calendar.date(from: components)
    let comp2 = calendar.dateComponents([.year,.month,.day,.hour,.minute], from: date!)
    let trigger = UNCalendarNotificationTrigger(dateMatching: comp2, repeats: true)

    let content = UNMutableNotificationContent()
    content.title = "Notification Demo"
    content.subtitle = "Demo"
    content.body = "Notification on specific date!!"

    let request = UNNotificationRequest(
        identifier: "identifier",
        content: content,
        trigger: trigger
    )

    UNUserNotificationCenter.current().add(request, withCompletionHandler: { error in
        if error != nil {
            //handle error
        } else {
            //notification set up successfully
        }
    })

希望对您有所帮助。

Answer 4

要在特定时间使用下面的代码启动通知。

let content = UNMutableNotificationContent()
content.title = "Title"
content.body = "Body"
content.sound = UNNotificationSound.default()
                
let gregorian = Calendar(identifier: .gregorian)
let now = Date()
var components = gregorian.dateComponents([.year, .month, .day, .hour, .minute, .second], from: now)
                
// Change the time to 7:00:00 in your locale
components.hour = 7
components.minute = 0
components.second = 0
                
let date = gregorian.date(from: components)!
                
let triggerDaily = Calendar.current.dateComponents([.hour,.minute,.second,], from: date)
let trigger = UNCalendarNotificationTrigger(dateMatching: triggerDaily, repeats: true)
              
                
let request = UNNotificationRequest(identifier: CommonViewController.Identifier, content: content, trigger: trigger)
print("INSIDE NOTIFICATION")
                
UNUserNotificationCenter.current().add(request, withCompletionHandler: {(error) in
    if let error = error {
        print("SOMETHING WENT WRONG")
    }
})

并在特定时间间隔内不断启动，例如每 2 分钟后使用下面的行触发。

let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 120, repeats: true)

Answer 5

这是在特定时间添加通知的最简单方法，它基于 Apple 的开发者文档：https://developer.apple.com/documentation/usernotifications

这是我在模块化函数中的实现：

public func simpleAddNotification(hour: Int, minute: Int, identifier: String, title: String, body: String) {
    // Initialize User Notification Center Object
    let center = UNUserNotificationCenter.current()

    // The content of the Notification
    let content = UNMutableNotificationContent()
    content.title = title
    content.body = body
    content.sound = .default

    // The selected time to notify the user
    var dateComponents = DateComponents()
    dateComponents.calendar = Calendar.current
    dateComponents.hour = hour
    dateComponents.minute = minute

    // The time/repeat trigger
    let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: true)

    // Initializing the Notification Request object to add to the Notification Center
    let request = UNNotificationRequest(identifier: identifier, content: content, trigger: trigger)

    // Adding the notification to the center
    center.add(request) { (error) in
        if (error) != nil {
            print(error!.localizedDescription)
        }
    }
}

在 iOS 的特定时间启动本地通知

Launch a local notification at a specific time in iOS

time

timer

ios

uilocalnotification

swift