Xcode – SourceKitService taking up to 200% of CPU

I just updated to Xcode 12.5.1, and now my SourceKitService is taking insanely high amounts of my CPU whenever I edit a specific file. After editing this file to any extent my CPU usage jumps through the roof, and basic services such as code completion stop working. I’ve already tried most of the solutions online about this issue, and nothing is helping. Does anyone have any ideas for this? Thanks.

I’ll just put all of the file’s code in here, because I’m not sure where the issue might originate.

//
//  ScheduleView.swift
//  ClassWidget
//
//  Created by Ben K on 6/17/21.
//

import SwiftUI
import CoreData

struct ScheduleView: View {
    @Environment(.managedObjectContext) var moc
    
    @ObservedObject var schedule: Schedule
    @State private var showingAddPeriod = false
    @State private var showingEditPeriod = false
    @State private var editPeriod: Period?
    @State private var isEditMode: EditMode = .inactive
    
    @State private var showingSettings = false
    @State private var showingPreview = false
    
    @State private var showingWarning = false
    @State private var warningPeriod: Period?
    
    var timeFormatter: DateFormatter {
        let formatter = DateFormatter()
        formatter.dateStyle = .none
        formatter.timeStyle = .short
        return formatter
    }
    
    var body: some View {
        ZStack {
            Text("(editPeriod?.uName ?? "")")
                .hidden()
            List {
                Section(header: Text("Classes")) {
                    if !schedule.periods.isEmpty {
                        ForEach(schedule.periods) { period in
                            Button(action: { editPeriod = period; isEditMode = .inactive; showingEditPeriod = true }) {
                                HStack {
                                    VStack {
                                        Text(timeFormatter.string(from: period.uStart))
                                        Text("to")
                                        Text(timeFormatter.string(from: period.uEnd))
                                    }
                                    .font(.caption)
                                    .padding(.trailing, 10)
                                    .padding(6)
                                    
                                    Divider()
                                        .frame(height: 35)
                                        .padding(.trailing)
                                    
                                    VStack(alignment: .leading) {
                                        Text(period.uName)
                                        
                                        if period.uTeacher != "" && period.uRoom != "" {
                                            Text("(period.uTeacher) • (period.uRoom)")
                                                .font(.caption)
                                                .foregroundColor(.secondary)
                                        } else if period.uTeacher != "" {
                                            Text("(period.uTeacher)")
                                                .font(.caption)
                                                .foregroundColor(.secondary)
                                        } else if period.uRoom != "" {
                                            Text("(period.uRoom)")
                                                .font(.caption)
                                                .foregroundColor(.secondary)
                                        }
                                    }
                                    
                                    Spacer()
                                    
                                    Image(systemName: "chevron.right")
                                        .renderingMode(.template)
                                        .padding(.trailing, 10)
                                        .opacity(0.5)
                                }
                                .foregroundColor(.primary)
                            }
                        }
                        .onDelete(perform: delete)
                    } else {
                        VStack(alignment: .leading) {
                            Text("No classes yet")
                                .font(.headline)
                            Text("Start adding classes to create this schedule!")
                                .font(.caption)
                                .italic()
                        }
                        .padding(8)
                    }
                }
                
                Section {
                    Button(action: {
                        showingSettings = true
                    }) {
                        HStack {
                            Text("Settings")
                            Spacer()
                            Image(systemName: "chevron.right")
                                .padding(.trailing, 10)
                                .opacity(0.5)
                        }
                        .foregroundColor(.primary)
                    }
                }
                
                Button("Preview Widget") {
                    showingPreview = true
                }
                
            }
            .listStyle(InsetGroupedListStyle())
        }
        .navigationTitle(schedule.uName)
        .navigationBarTitleDisplayMode(.inline)
        .navigationBarItems(trailing: Button(action: {
            showingAddPeriod = true
        }) {
            Image(systemName: "plus").padding([.vertical, .leading])
        })
        .sheet(isPresented: $showingAddPeriod) {
            AddPeriod(schedule: schedule)
                .environment(.managedObjectContext, self.moc)
        }
        /*.sheet(isPresented: $showingEditPeriod) {
            if let period = editPeriod {
                AddPeriod(period: period)
                    .environment(.managedObjectContext, self.moc)
            }
        }*/
        .fullScreenCover(isPresented: $showingEditPeriod, onDismiss: dismissedSheet) {
            if let period = editPeriod {
                AddPeriod(period: period)
                    .environment(.managedObjectContext, self.moc)
            }
        }
        .fullScreenCover(isPresented: $showingSettings) {
            ScheduleSettingsView(schedule: schedule)
                .environment(.managedObjectContext, self.moc)
        }
        .sheet(isPresented: $showingPreview) {
            PreviewWidget(schedule: schedule)
        }
        .alert(isPresented: $showingWarning) {
            Alert(title: Text("Delete (warningPeriod?.uName ?? "")"), message: Text("Are you sure?"), primaryButton: .destructive(Text("Delete")) {
                try? moc.save()
            }, secondaryButton: .cancel() {
                if let period = warningPeriod {
                    readdPeriod(period: period)
                }
            })
        }
        .environment(.editMode, self.$isEditMode)
        
    }
    
    func delete(at offsets: IndexSet) {
        for offset in offsets {
            warningPeriod = schedule.periods[offset]
            moc.delete(schedule.periods[offset])
            showingWarning = true
        }
    }
    
    func readdPeriod(period: Period) {
        let newPeriod = Period(period: period, context: moc)
        newPeriod.schedule = schedule
        try? moc.save()
    }
    
    func dismissedSheet() {
        schedule.objectWillChange.send()
    }
}


struct ScheduleView_Previews: PreviewProvider {
    static let moc = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType)
    
    static var previews: some View {
        let schedule = Schedule(name: "Example Schedule", number: 0, context: moc)
        
        NavigationView {
            ScheduleView(schedule: schedule)//.preferredColorScheme(.dark)
        }
    }
}