SwiftUI Core Data 93 - 데이터 Refresh
92 강좌에서 데이터 수정후 리스트 refresh가 안되는 현상을 수정하기 위한 방법
#1. ContentView
import SwiftUI
struct ContentView: View {
let coreDM: CoreDataManager
@State private var movieName: String = ""
@State private var movies: [Movie] = [Movie]()
@State private var needsRefresh: Bool = false //리플레쉬 버그를 해결하기 위해
//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: $movieName).textFieldStyle(RoundedBorderTextFieldStyle())
Button("Save"){
coreDM.saveMovie(title: movieName)
populateMovies()
}
List{
ForEach(movies, id: \.self){ movie in
NavigationLink(
destination: MovieDetail(movie: movie, coreDM:coreDM, needsRefresh:$needsRefresh),
label: {
Text(movie.title ?? "")
})
}.onDelete(perform: { indexSet in
indexSet.forEach{ index in
let movie = movies[index]
coreDM.deleteMovie(movie: movie)
populateMovies()
}
})
}.listStyle(PlainListStyle())
.accentColor(needsRefresh ? .white: .black)
Spacer()
}.padding()
.onAppear(perform: {
populateMovies()
})
}
////NavigatioView End
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView(coreDM: CoreDataManager())
}
}
#2. MovieDetail
import SwiftUI
struct MovieDetail: View {
let movie: Movie
@State private var movieName: String = ""
let coreDM: CoreDataManager
@Binding var needsRefresh: Bool
var body: some View {
VStack{
TextField(movie.title ?? "", text:$movieName).textFieldStyle(RoundedBorderTextFieldStyle())
Button("Update"){
if !movieName.isEmpty{
movie.title = movieName
coreDM.updateMovie()
needsRefresh.toggle()
}
}
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, needsRefresh: .constant(false))
}
}
