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SwiftUI Core Data 92 - 데이터 업데이트SwiftUI 100 레시피/Core Data 2022. 7. 1. 13:08
#1. CoreDataManager, updateMovie() 함수 생성
import Foundation
import CoreData
class CoreDataManager{
let persistentContainer: NSPersistentContainer
init(){
persistentContainer = NSPersistentContainer(name: "HelloCoreDataModel")
persistentContainer.loadPersistentStores{(description, error) in
if let error = error {
fatalError("Core Data Store failed to initialize \(error.localizedDescription)")
}
}
}
//Fetch
func getAllMovies() -> [Movie]{
let fetchRequest: NSFetchRequest<Movie> = Movie.fetchRequest()
do{
return try persistentContainer.viewContext.fetch(fetchRequest)
} catch {
return []
}
}
//Update
func updateMovie(){
do{
try persistentContainer.viewContext.save()
} catch{
persistentContainer.viewContext.rollback()
print("Failed to save context", error.localizedDescription)
}
}
//Delete
func deleteMovie(movie: Movie){
persistentContainer.viewContext.delete(movie)
do{
try persistentContainer.viewContext.save()
} catch {
persistentContainer.viewContext.rollback()
print("Failed to save context", error.localizedDescription)
}
}
//Save Entity
func saveMovie(title: String){
let movie = Movie(context: persistentContainer.viewContext)
movie.title = title
do{
try persistentContainer.viewContext.save()
print("Movie saved!")
} catch{
print("Failed to save movie", error )
}
}
}
#2. MovieDetail 생성
import SwiftUI
struct MovieDetail: View {
let movie: Movie
@State private var movieName: String = ""
let coreDM: CoreDataManager
var body: some View {
VStack{
TextField(movie.title ?? "", text:$movieName).textFieldStyle(RoundedBorderTextFieldStyle())
Button("Update"){
if !movieName.isEmpty{
movie.title = movieName
coreDM.updateMovie()
}
}
Spacer()
}.padding()
}
}
struct MovieDetail_Previews: PreviewProvider {
static var previews: some View {
let coreDM = CoreDataManager()
let movie = Movie(context: coreDM.persistentContainer.viewContext)
MovieDetail(movie: movie, coreDM: coreDM)
}
}
#3. ContentView 수정
import SwiftUI
struct ContentView: View {
let coreDM: CoreDataManager
@State private var movieName: String = ""
@State private var movies: [Movie] = [Movie]()
//데이터 가져오기
private func populateMovies(){
movies = coreDM.getAllMovies()
print(movies[0].title!)
}
var body: some View {
////NavigatioView Start
NavigationView{
VStack{
TextField("Enter movie name", text: $movieName).textFieldStyle(RoundedBorderTextFieldStyle())
Button("Save"){
coreDM.saveMovie(title: movieName)
populateMovies()
}
List{
ForEach(movies, id: \.self){ movie in
NavigationLink(
destination: MovieDetail(movie: movie, coreDM:coreDM),
label: {
Text(movie.title ?? "")
})
}.onDelete(perform: { indexSet in
indexSet.forEach{ index in
let movie = movies[index]
coreDM.deleteMovie(movie: movie)
populateMovies()
}
})
}.listStyle(PlainListStyle())
Spacer()
}.padding()
.onAppear(perform: {
populateMovies()
})
}
////NavigatioView End
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView(coreDM: CoreDataManager())
}
}
수정할 리스트 선택 
수정전 
데이터 수정 
수정후 Back버튼 누를경우(현재 버그상태로 데이터가 refresh 되지 않음) 'SwiftUI 100 레시피 > Core Data' 카테고리의 다른 글
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