[英]Delete Local Notification if removed from Core Data SwiftUI
我編寫了這個簡單的代碼來嘗試本地通知如何與 Core Data 一起工作,主要問題是,在添加 Data Core 項目后,我可以在 60 秒后收到通知,但如果我刪除它,我仍然會收到它。 當我調用我的 deleteItem function 時,是否有一個 function 可以調用以刪除該特定通知?
我的另一個問題是如何設置一周中的某一天和觸發該通知的時間,而不是在幾秒鍾后重復?
內容視圖:
import UserNotifications
import SwiftUI
import CoreData
struct ContentView: View {
//Core Data
@Environment(\.managedObjectContext) var managedObjectContext
@FetchRequest(entity: Notifications.entity(), sortDescriptors: [NSSortDescriptor(keyPath: \Notifications.date, ascending: false)]) var notifications: FetchedResults<Notifications>
var titles = ["Hello", "Weekend", "Streaming", "ScoobyDoo"]
var subtitles = ["Hello2", "Weekend2", "Streaming2", "ScoobyDoo2"]
var body: some View {
NavigationView {
VStack {
NavigationLink(destination: FavoriteView()) {
Text("Favorite View")
}
List {
ForEach(0 ..< titles.count) {title in
HStack {
Text(self.titles[title])
Image(systemName: "heart")
.onTapGesture {
if self.checkItem(title: self.titles[title]) {
do {
try self.deleteItem(title: self.titles[title])
print("title deleted")
} catch {
print(error)
}
} else {
self.addItem(item: self.titles[title])
print("item added")
// Notification content
let content = UNMutableNotificationContent()
content.title = self.titles[title]
content.subtitle = self.subtitles[title]
content.sound = UNNotificationSound.default
let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 60, repeats: true)
let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
UNUserNotificationCenter.current().add(request)
}
}
}
}
}
Button("Request Authorization") {
// Ask for notification when app launches
UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound]) { success, error in
if success {
print("All set")
} else if let error = error {
print(error.localizedDescription)
}
}
}
Button("Remove Notifications") {
UNUserNotificationCenter.current().removeAllDeliveredNotifications()
print("Removed")
}
}
}
}
private func checkItem(title: String) -> Bool {
let request: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: "Notifications")
request.predicate = NSPredicate(format: "title == %@", title)
request.fetchLimit = 1
var trueFalse = true
do {
let count = try managedObjectContext.count(for: request)
if count == 0 {
trueFalse = false
} else {
trueFalse = true
}
} catch {
print(error)
}
return trueFalse
}
private func deleteItem(title: String) throws {
let request: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: "Notifications")
request.predicate = NSPredicate(format: "title == %@", title)
try managedObjectContext.execute(NSBatchDeleteRequest(fetchRequest: request))
saveFavorites()
}
func addItem(item: String) {
let newItem = Notifications(context: managedObjectContext)
newItem.title = item
saveFavorites()
}
func saveFavorites() {
do {
try managedObjectContext.save()
} catch {
print(error)
}
}
}
收藏視圖:
import SwiftUI
import CoreData
struct FavoriteView: View {
//Core Data
@Environment(\.managedObjectContext) var managedObjectContext
@FetchRequest(entity: Notifications.entity(), sortDescriptors: [NSSortDescriptor(keyPath: \Notifications.date, ascending: false)]) var notifications: FetchedResults<Notifications>
var body: some View {
List {
ForEach(notifications, id: \.self) { item in
Text(item.title)
}
}
}
}
修改核心數據 model 以包含您在添加請求時提供的通知標識符。 然后在從核心數據中刪除通知時,您可以使用此標識符刪除本地通知,如下所示:
UNUserNotificationCenter.current().removeDeliveredNotifications(withIdentifiers: [identifier])
UNUserNotificationCenter.current().removePendingNotificationRequests(withIdentifiers: [identifier])
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