我尝试在首次加载视图时将一些数据预加载到CoreData中，此时还没有任何条目，并且视图创建了正确的条目数，但随后它会将这些条目设置为相同的值（相同项目的重复）。这个想法是创建一个CoreData实体，预先加载用户可以在整个应用程序中获得的成就，它只会更新条目的“completed”属性。问题是，它创建了正确的条目数，但创建的都是一样的。下面是我目前拥有的：
import SwiftUI
import CoreData
struct AchievementView: View {
@Environment(\.managedObjectContext) private var viewContext
@FetchRequest(entity: Achievements.entity(), sortDescriptors: [
NSSortDescriptor(key: "id", ascending: true)])
private var achievements: FetchedResults<Achievements>
var body: some View {
NavigationView {
ZStack {
Color("Background")
.ignoresSafeArea(.all)
VStack {
HStack {
let completedCount = achievements.filter(\.completed).count
let totalCount = achievements.count
let pctComp: Double = (Double(completedCount) / Double(totalCount)) * 100
Image(systemName: "star.circle").padding(.leading, 5)
.foregroundColor(.secondary)
Text("Achievements".uppercased())
.fontWeight(.heavy)
.foregroundColor(.secondary)
Spacer()
Text("\(completedCount) OF \(totalCount) (\(pctComp, specifier: "%.f")%)")
.font(.system(size:16))
.fontWeight(.heavy)
.foregroundColor(.secondary)
.padding(.trailing, 10)
}
ScrollView(showsIndicators: false) {
VStack {
ForEach(achievements) { achievement in
HStack {
VStack {
if achievement.completed == false {
Text(achievement.image ?? "")
.padding()
.grayscale(0.99)
.overlay (
Circle()
.stroke(Color(.systemGray6), lineWidth: 2)
).padding()
} else {
Text(achievement.image ?? "")
.padding()
.overlay (
Circle()
.stroke(Color.green, lineWidth: 2)
).padding()
}
}
VStack{
if achievement.completed == false {
HStack {
Text(achievement.name ?? "")
.fontWeight(.heavy)
.foregroundColor(Color(.systemGray2))
Spacer()
}
HStack {
Text(achievement.desc ?? "")
.fontWeight(.light)
.font(.system(size:10))
.foregroundColor(Color(.systemGray2))
Spacer()
}
} else {
HStack {
Text(achievement.name ?? "")
.fontWeight(.heavy)
Spacer()
}
HStack {
Text(achievement.desc ?? "")
.fontWeight(.light)
.font(.system(size:10))
Spacer()
}
}
}
Spacer()
} .background(Color("WeekShowBack"))
.cornerRadius(15)
}
}
}
}.padding()
}
}.navigationViewStyle(StackNavigationViewStyle())
.onAppear(perform: loadAchievements)
}
private func loadAchievements() {
print("Number of Times Called")
let achievementNames = ["First Entry", "Movie Starter"]
let achievemnetDesc = ["Enter your first movie or show", "Track 10 Movies"]
let achievementComp = [false, false]
let achievementImage = ["🥇","🔟"]
if achievements.count == 0 {
for index in 0..<achievementNames.count {
let newAchievement = Achievements(context: self.viewContext)
newAchievement.name = achievementNames[index]
newAchievement.desc = achievemnetDesc[index]
newAchievement.completed = achievementComp[index]
newAchievement.image = achievementImage[index]
do {
try viewContext.save()
print("Achievement Loaded!!!!!!")
} catch let error {
print(error)
}
}
}
}
}
1条答案
按热度按时间lc8prwob1#
谢天谢地，我终于明白了！这简直要把我逼疯了，但我不知道这有什么关系，因为我以为CoreData会自动分配一个。不管怎样，我在函数的do语句中添加了这一行：
现在它在CoreData中创建了正确的成果，现在我可以开始实际编码每个成果了。谢谢大家的帮助！