✨ RaPla parser is now aware of recurring events

- Also some small improvements and basic implementation of Notifications

DHBW-Service.xcodeproj/project.pbxproj

@@ -16,6 +16,7 @@
 		CD730A35259A860E00E0BB69 /* SettingsAcknowledgements.swift in Sources */ = {isa = PBXBuildFile; fileRef = CD730A34259A860E00E0BB69 /* SettingsAcknowledgements.swift */; };
 		CD8555BE25C47AE500C4ACD6 /* RaPlaFetcher.swift in Sources */ = {isa = PBXBuildFile; fileRef = CD8555BD25C47AE500C4ACD6 /* RaPlaFetcher.swift */; };
 		CD8555C325C47B5300C4ACD6 /* ApiService.swift in Sources */ = {isa = PBXBuildFile; fileRef = CD8555C225C47B5300C4ACD6 /* ApiService.swift */; };
+		CD9E3F0F25DC466100C77D10 /* SettingsPushNotifications.swift in Sources */ = {isa = PBXBuildFile; fileRef = CD9E3F0E25DC466100C77D10 /* SettingsPushNotifications.swift */; };
 		CD9FAB81258EC60200D6D0C5 /* DHBW_ServiceApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = CD9FAB80258EC60200D6D0C5 /* DHBW_ServiceApp.swift */; };
 		CD9FAB83258EC60200D6D0C5 /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = CD9FAB82258EC60200D6D0C5 /* ContentView.swift */; };
 		CD9FAB85258EC60600D6D0C5 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = CD9FAB84258EC60600D6D0C5 /* Assets.xcassets */; };
@@ -69,6 +70,8 @@
 		CD730A34259A860E00E0BB69 /* SettingsAcknowledgements.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SettingsAcknowledgements.swift; sourceTree = "<group>"; };
 		CD8555BD25C47AE500C4ACD6 /* RaPlaFetcher.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RaPlaFetcher.swift; sourceTree = "<group>"; };
 		CD8555C225C47B5300C4ACD6 /* ApiService.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ApiService.swift; sourceTree = "<group>"; };
+		CD9E3F0A25DC3C9A00C77D10 /* DHBW-Service.entitlements */ = {isa = PBXFileReference; lastKnownFileType = text.plist.entitlements; path = "DHBW-Service.entitlements"; sourceTree = "<group>"; };
+		CD9E3F0E25DC466100C77D10 /* SettingsPushNotifications.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SettingsPushNotifications.swift; sourceTree = "<group>"; };
 		CD9FAB7D258EC60200D6D0C5 /* DHBW-Service.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = "DHBW-Service.app"; sourceTree = BUILT_PRODUCTS_DIR; };
 		CD9FAB80258EC60200D6D0C5 /* DHBW_ServiceApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DHBW_ServiceApp.swift; sourceTree = "<group>"; };
 		CD9FAB82258EC60200D6D0C5 /* ContentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentView.swift; sourceTree = "<group>"; };
@@ -179,6 +182,7 @@
 			isa = PBXGroup;
 			children = (
 				CD730A34259A860E00E0BB69 /* SettingsAcknowledgements.swift */,
+				CD9E3F0E25DC466100C77D10 /* SettingsPushNotifications.swift */,
 			);
 			path = SettingsSubViews;
 			sourceTree = "<group>";
@@ -206,6 +210,7 @@
 		CD9FAB7F258EC60200D6D0C5 /* DHBW-Service */ = {
 			isa = PBXGroup;
 			children = (
+				CD9E3F0A25DC3C9A00C77D10 /* DHBW-Service.entitlements */,
 				CDCD720F25912D3C00FBF2F5 /* App */,
 				CDCD721025912D4900FBF2F5 /* Views */,
 				CDDCF4792591FE410027CDC5 /* Utility */,
@@ -475,6 +480,7 @@
 				CD9FAB8A258EC60600D6D0C5 /* Persistence.swift in Sources */,
 				CD730A35259A860E00E0BB69 /* SettingsAcknowledgements.swift in Sources */,
 				CD9FAB83258EC60200D6D0C5 /* ContentView.swift in Sources */,
+				CD9E3F0F25DC466100C77D10 /* SettingsPushNotifications.swift in Sources */,
 				CDCD72242591316500FBF2F5 /* LocalSettings.swift in Sources */,
 				CDD970E125D453D90061755E /* RaPlaEvent+CoreDataClass.swift in Sources */,
 				CDD970DD25D453D90061755E /* User+CoreDataClass.swift in Sources */,
@@ -675,8 +681,11 @@
 		CD9FABA8258EC60600D6D0C5 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CODE_SIGN_ENTITLEMENTS = "DHBW-Service/DHBW-Service.entitlements";
 				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1.0.1;
 				DEVELOPMENT_ASSET_PATHS = "\"DHBW-Service/Preview Content\"";
 				DEVELOPMENT_TEAM = HS7KNT4MZ2;
 				ENABLE_PREVIEWS = YES;
@@ -696,8 +705,11 @@
 		CD9FABA9258EC60600D6D0C5 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
 				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CODE_SIGN_ENTITLEMENTS = "DHBW-Service/DHBW-Service.entitlements";
 				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1.0.1;
 				DEVELOPMENT_ASSET_PATHS = "\"DHBW-Service/Preview Content\"";
 				DEVELOPMENT_TEAM = HS7KNT4MZ2;
 				ENABLE_PREVIEWS = YES;

DHBW-Service/App/DHBW_ServiceApp.swift

@@ -6,9 +6,11 @@
 //
 
 import SwiftUI
+import UserNotifications
 
 @main
 struct DHBW_ServiceApp: App {
+    @UIApplicationDelegateAdaptor private var appDelegate: AppDelegate
     let persistenceController = PersistenceController.shared
     let settings = LocalSettings()
     
@@ -20,3 +22,21 @@ struct DHBW_ServiceApp: App {
         }
     }
 }
+
+//*** Implement App delegate ***//
+class AppDelegate: NSObject, UIApplicationDelegate {
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
+        return true
+    }
+    
+    //No callback in simulator
+    //-- must use device to get valid push token
+    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data)          {
+        let tokenParts = deviceToken.map { data in String(format: "%02.2hhx", data) }
+        let token = tokenParts.joined()
+        print("Device Token: \(token)")
+    }
+    func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {
+        print(error.localizedDescription)
+    }
+}

DHBW-Service/CoreData/DHBW_Service.xcdatamodeld/DHBW_Service.xcdatamodel/contents

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="17709" systemVersion="20D62" minimumToolsVersion="Automatic" sourceLanguage="Swift" usedWithCloudKit="YES" userDefinedModelVersionIdentifier="">
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="17709" systemVersion="20E5172i" minimumToolsVersion="Automatic" sourceLanguage="Swift" usedWithCloudKit="YES" userDefinedModelVersionIdentifier="">
     <entity name="Lecturer" representedClassName="Lecturer" syncable="YES">
         <attribute name="email" optional="YES" attributeType="String"/>
         <attribute name="name" optional="YES" attributeType="String"/>
@@ -20,10 +20,11 @@
         <attribute name="course" optional="YES" attributeType="String"/>
         <attribute name="director" optional="YES" attributeType="String"/>
         <attribute name="name" optional="YES" attributeType="String"/>
+        <attribute name="raplaLink" optional="YES" attributeType="String"/>
     </entity>
     <elements>
         <element name="Lecturer" positionX="-351" positionY="99" width="128" height="74"/>
         <element name="RaPlaEvent" positionX="-271.3642578125" positionY="83.64776611328125" width="128" height="164"/>
-        <element name="User" positionX="-428.6358032226562" positionY="2.067169189453125" width="128" height="74"/>
+        <element name="User" positionX="-428.6358032226562" positionY="2.067169189453125" width="128" height="89"/>
     </elements>
 </model>

DHBW-Service/CoreData/Persistence.swift

@@ -90,6 +90,18 @@ struct PersistenceController {
         normalEvent2.category = "Lehrveranstaltung"
         examEvent.category = "Prüfung"
         
+        
+        let lecturer1 = Lecturer(context: PersistenceController.shared.context)
+        let lecturer2 = Lecturer(context: PersistenceController.shared.context)
+        lecturer1.name = "Mustermann, Prof. Dr."
+        lecturer1.email = "mustermann@dhbw-karlsruhe.de"
+        lecturer2.name = "Musterfrau, Prof. Dr."
+        lecturer2.email = "musterfrau@dhbw-karlsruhe.de"
+        normalEvent1.addToLecturers(lecturer1)
+        normalEvent2.addToLecturers(lecturer2)
+        examEvent.addToLecturers(lecturer1)
+        examEvent.addToLecturers(lecturer2)
+        
         var currentDate = Date()
         currentDate.addTimeInterval(1*60*60);normalEvent1.startDate = currentDate
         currentDate.addTimeInterval(1*60*60);normalEvent2.startDate = currentDate

DHBW-Service/DHBW-Service.entitlements

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>aps-environment</key>
+	<string>development</string>
+</dict>
+</plist>

DHBW-Service/Supporting Files/Info.plist

@@ -20,16 +20,22 @@
 				<false/>
 			</dict>
 		</dict>
-		<key>CFBundlePrimaryIcon</key>
+	</dict>
+	<key>CFBundleIcons~ipad</key>
+	<dict>
+		<key>CFBundleAlternateIcons</key>
+		<dict>
+			<key>Alpaca-Alt-Icon</key>
 			<dict>
 				<key>CFBundleIconFiles</key>
 				<array>
-				<string>dhbw-standard-icon</string>
+					<string>alpaca-alt-icon</string>
 				</array>
 				<key>UIPrerenderedIcon</key>
 				<false/>
 			</dict>
 		</dict>
+	</dict>
 	<key>CFBundleIdentifier</key>
 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
 	<key>CFBundleInfoDictionaryVersion</key>
@@ -41,7 +47,9 @@
 	<key>CFBundleShortVersionString</key>
 	<string>1.0</string>
 	<key>CFBundleVersion</key>
-	<string>1</string>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+	<key>ITSAppUsesNonExemptEncryption</key>
+	<false/>
 	<key>LSRequiresIPhoneOS</key>
 	<true/>
 	<key>UIApplicationSceneManifest</key>

DHBW-Service/Utility/RaPlaFetcher.swift

@@ -18,6 +18,13 @@ class RaPlaFetcher {
         var category: String = ""       // CATEGORIES
         var uid: String = ""            // UID
         var lecturers: [LecturerObj] = []  // ATTENDEE
+        var excludedDates: [Date] = []  // EXDATE
+        var isRecurring: Bool = false   // If the event is recurring
+        var frequency: String = ""      // Frequence in case of recurring events, e.g. DAILY or WEEKLY
+        var recCount: Int = 0           // How often the event occurs in case of recurring events
+        var recInterval: Int = 0        // Interval of the recurring event, e.g. 1 for every week / day / ...
+        var recDay: String = ""         // The day of the recurrence, e.g. FR for friday
+        var recUntil: Date = Date()     // Until when the event has to be repeated
     }
     
     public class LecturerObj {
@@ -84,7 +91,14 @@ class RaPlaFetcher {
             for lineNr in 0...lines.count-1 {
                 if(lines[lineNr].hasPrefix(" ")){
                     lines[lineNr] = String(lines[lineNr].dropFirst())
-                    lines[lineNr-1].append(lines[lineNr])
+                    
+                    // If there are more than 2 lines that have to be merged, we need to find out how many lines we have to go up
+                    var goUp = 1
+                    while(lines[lineNr-goUp] == ""){
+                        goUp += 1
+                    }
+                    
+                    lines[lineNr-goUp].append(lines[lineNr])
                     lines[lineNr] = ""
                 }
             }
@@ -144,6 +158,57 @@ class RaPlaFetcher {
                     lecturer.email = lecturerEmail
                     
                     evt.lecturers.append(lecturer)
+                } else if(line.hasPrefix("RRULE")) {
+                    // This line normally looks like this:  RRULE:FREQ=WEEKLY;COUNT=12;INTERVAL=1;BYDAY=TU
+                    // Can also look smth like this though: RRULE:FREQ=WEEKLY;COUNT=12
+                    
+                    evt.isRecurring = true
+                    
+                    let params = lineWithoutPrefix.components(separatedBy: ";")
+                    
+                    for param in params {
+                        let keyword = param[param.startIndex..<param.firstIndex(of: "=")!]
+                        let value = param[param.index(param.firstIndex(of: "=")!, offsetBy: 1)..<param.endIndex]
+                        
+                        switch keyword {
+                        case "FREQ":
+                            evt.frequency = String(value)
+                            break
+                        case "COUNT":
+                            evt.recCount = Int(value)!
+                            break
+                        case "INTERVAL":
+                            evt.recInterval = Int(value)!
+                            break
+                        case "BYDAY":
+                            evt.recDay = String(value)
+                            break
+                        case "UNTIL":
+                            let dateFormatter = DateFormatter()
+                            dateFormatter.dateFormat = "yyyyMMdd"
+                            let date = dateFormatter.date(from: String(value))!
+                            evt.recUntil = date
+                            break
+                        default:
+                            print("Unknown parameter found: " + line)
+                        }
+                    }
+                } else if (line.hasPrefix("EXDATE")) {
+                    // Excluded from recurring events
+                    // Format: 20210401T133000,20210408T133000,20210513T133000
+                    
+                    let exclDateStrings = lineWithoutPrefix.components(separatedBy: ",")
+                    
+                    for exclDate in exclDateStrings {
+                        let dateFormatter = DateFormatter()
+                        if(lineWithoutPrefix.contains("Z")){
+                            dateFormatter.dateFormat = "yyyyMMdd'T'HHmmss'Z'"
+                        } else {
+                            dateFormatter.dateFormat = "yyyyMMdd'T'HHmmss"
+                        }
+                        let date = dateFormatter.date(from: exclDate)!
+                        evt.excludedDates.append(date)
+                    }
                 }
             }
             
@@ -156,37 +221,125 @@ class RaPlaFetcher {
     // Save the given iCalEvent objects to CoreData
     // Updates the events if they already exist and deletes old (/invalid) ones
     private class func saveToCoreData(eventObjects: [iCalEvent]) -> Bool{
+        // Get known UIDs
         let existingEvents: [RaPlaEvent] = RaPlaEvent.getAll()
         var existingEventsDict: [String:RaPlaEvent] = [:]
         for event in existingEvents {
             existingEventsDict[event.uid!] = event
         }
-        let newEventUIDs = eventObjects.map{$0.uid}
+        // List for new UIDs
+        var newEventUIDs: [String] = []
         
         for event in eventObjects {
             // If the event already exists locally, update it. Otherwise, create a new record
+            if(event.isRecurring){
+                // Create as many events as we need
+                // If we e.g. need 12 events, we create 0...11
+                for iteration in 0..<event.recCount {
+                    // Calculate start- and enddate
+                    // Calculate offset
+                    let offsetType: Calendar.Component
+                    let offsetAmount: Int
+                    
+                    switch event.frequency {
+                    case "DAILY":
+                        offsetType = Calendar.Component.day
+                        offsetAmount = 1
+                        break
+                    case "WEEKLY":
+                        offsetType = Calendar.Component.day
+                        offsetAmount = 7
+                        break
+                    case "MONTHLY":
+                        offsetType = Calendar.Component.month
+                        offsetAmount = 1
+                        break
+                    case "YEARLY":
+                        offsetType = Calendar.Component.year
+                        offsetAmount = 1
+                        break
+                    default:
+                        offsetType = Calendar.Component.day
+                        offsetAmount = 0
+                        print("Found unknown frequency: " + event.frequency)
+                    }
+                    
+                    let startDate = Calendar.current.date(byAdding: offsetType, value: (offsetAmount * iteration), to: event.startDate)!
+                    let endDate = Calendar.current.date(byAdding: offsetType, value: (offsetAmount * iteration), to: event.endDate)!
+                    
+                    // Check if this recurrence should be excluded
+                    if(event.excludedDates.contains(startDate)){
+                        continue
+                    }
+                    
+                    // Generate UID
+                    // Appending iteration to distinguish between recurring events
+                    let newUID = event.uid + "---" + String(iteration)
+                    
+                    // Create or update existing CoreData object
                     let evt: RaPlaEvent
-            if existingEventsDict.keys.contains(event.uid) {
+                    if existingEventsDict.keys.contains(newUID) {
-                evt = existingEventsDict[event.uid]!
+                        evt = existingEventsDict[newUID]!
                     } else {
                         evt = RaPlaEvent(context: PersistenceController.shared.context)
                         
                         // Set default values for new object
                         evt.isHidden = false
                     }
+                    
+                    // Populate fields
+                    // (offsetAmount * iteration) because for the 1st event, we dont want to add an offset, and
+                    // for every event after that we want to add e.g. 1 week, 2 weeks, 3 weeks etc.
+                    evt.startDate = startDate
+                    evt.endDate = endDate
+                    evt.summary = event.summary
+                    evt.descr = event.description
+                    evt.location = event.location
+                    evt.category = event.category
+                    evt.uid = newUID
+                    for lecturer in event.lecturers {
+                        let lect = Lecturer(context: PersistenceController.shared.context)
+                        lect.name = lecturer.name
+                        lect.email = lecturer.email
+                        lect.event = evt
+                    }
+                    
+                    // Add UID to new UIDs list
+                    newEventUIDs.append(newUID)
+                }
+            } else {
+                // Generate UID
+                let newUID = event.uid + "---0"  // Appending ---0 to distinguish between recurring events
+                
+                // Create or update existing CoreData object
+                let evt: RaPlaEvent
+                if existingEventsDict.keys.contains(newUID) {
+                    evt = existingEventsDict[newUID]!
+                } else {
+                    evt = RaPlaEvent(context: PersistenceController.shared.context)
+                    
+                    // Set default values for new object
+                    evt.isHidden = false
+                }
+                
+                // Populate fields
                 evt.startDate = event.startDate
                 evt.endDate = event.endDate
                 evt.summary = event.summary
                 evt.descr = event.description
                 evt.location = event.location
                 evt.category = event.category
-            evt.uid = event.uid
+                evt.uid = newUID
                 for lecturer in event.lecturers {
                     let lect = Lecturer(context: PersistenceController.shared.context)
                     lect.name = lecturer.name
                     lect.email = lecturer.email
                     lect.event = evt
                 }
+                
+                // Add UID to new UIDs list
+                newEventUIDs.append(newUID)
+            }
         }
         
         // Now we also have to delete locally stored events that have been deleted from RaPla

DHBW-Service/Views/Other/FirstOpeningSettings.swift

@@ -11,8 +11,10 @@ import CoreData
 struct FirstOpeningSettings: View {
     @EnvironmentObject var settings: LocalSettings
     @State private var name = ""
+    @State private var dhbwLocation = ""
     @State private var course = ""
     @State private var director = ""
+    @State private var raplaLink = ""
     @State private var invalidInputName = false
     @State private var invalidInputCourse = false
     
@@ -28,10 +30,18 @@ struct FirstOpeningSettings: View {
                 .frame(minWidth: 200, idealWidth: nil, maxWidth: 500, minHeight: nil, idealHeight: nil, maxHeight: nil, alignment: .center)
                 .padding(.horizontal)
             
+            Picker(selection: self.$dhbwLocation, label: Text("Location")){
+                Text("Karlsruhe")
+                Text("Mannheim")
+                Text("Stuttgart")
+                Text("Mosbach")
+            }.frame(maxWidth: 500, alignment: .center)
+            .pickerStyle(SegmentedPickerStyle())
+            
             TextField("course".localized(tableName: "General"), text: self.$course)
                 .overlay(RoundedRectangle(cornerRadius: 10).stroke(invalidInputCourse ? Color.red : Color.secondary, lineWidth: 1))
                 .onChange(of: course, perform: { value in
-                    self.setDirector()
+                    self.setCourseInfo()
                     self.course = self.course.uppercased()
                 })
                 .foregroundColor(invalidInputCourse ? .red : .primary)
@@ -65,10 +75,12 @@ struct FirstOpeningSettings: View {
 }
 
 extension FirstOpeningSettings{
-    func setDirector() {
+    func setCourseInfo() {
-        if (course == "TINF19B4") {
+        // TODO: Replace this with some database query or stuff like this to load actual data
+        switch course {
+            case "TINF19B4":
                 director = "Jörn Eisenbiegler"
-        } else {
+            default:
                 director = ""
         }
     }

DHBW-Service/Views/Tabs/SettingsMain.swift

@@ -20,6 +20,11 @@ struct SettingsMain: View {
                         label: {
                             Text("Acknowledgements")
                         })
+                    NavigationLink(
+                        destination: SettingsPushNotifications(),
+                        label: {
+                            Text("Push Notifications")
+                        })
                     Button(action: {
                         self.showLogoutConfirmationAlert = true
                     }, label: {

DHBW-Service/Views/Tabs/SettingsSubViews/SettingsPushNotifications.swift

@@ -0,0 +1,72 @@
+//
+//  SettingsPushNotifications.swift
+//  DHBW-Service
+//
+//  Created by Patrick Müller on 16.02.21.
+//
+
+import SwiftUI
+
+struct SettingsPushNotifications: View {
+    @State private var notificationsEnabled = false
+    
+    var body: some View {
+        VStack {
+            Toggle(isOn: $notificationsEnabled) {
+                Text("Receive push notifications")
+            }
+            .frame(maxWidth: 500, alignment: .center)
+            
+            Button(action: {
+                scheduleTestNotification()
+            }){
+                Text("Test Notification")
+            }
+        }
+        .onChange(of: notificationsEnabled) { newVal in
+            if(newVal) {
+                enablePushService()
+            }
+        }
+    }
+}
+
+extension SettingsPushNotifications {
+    private func enablePushService() {
+        UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound]) { (allowed, error) in
+            //This callback does not trigger on main loop be careful
+            if allowed {
+                print("Allowed")
+            
+                // Get token
+                DispatchQueue.main.async {
+                    UIApplication.shared.registerForRemoteNotifications()
+                }
+            } else {
+                print("Error")
+            }
+        }
+    }
+    
+    private func scheduleTestNotification() {
+        let content = UNMutableNotificationContent()
+        content.title = "Upcoming Exam"
+        content.subtitle = "Your exam in theoretical computer science 3 is one week from now."
+        content.sound = UNNotificationSound.default
+
+        // show this notification five seconds from now
+        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 10, repeats: false)
+
+        // choose a random identifier
+        let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
+
+        // add our notification request
+        UNUserNotificationCenter.current().add(request)
+    }
+}
+
+struct SettingsPushNotifications_Previews: PreviewProvider {
+    static var previews: some View {
+        SettingsPushNotifications()
+    }
+}