在我的 SwiftUI 应用程序中,我有一个 .onDelete SwiftUI 修饰符(在导航视图、列表、ForEach、链接等内),用于滑动删除核心数据实体对象。直到删除核心数据对象为止一切都很好。当我在托管对象上下文上调用 .Save() 时,发生崩溃。我一直在拔头发试图找出原因。这是代码的快照:
List {
ForEach(claims, id: \.self.id) {(tmpClaim: Claim) in
NavigationLink(destination: EditClaimView(passedClaim: tmpClaim, uuidString: tmpClaim.id.uuidString)) {
HStack {
VStack(alignment: .leading, spacing: 5) {
Text(tmpClaim.providerName)
.font(.headline)
Text("\(tmpClaim.serviceDate, formatter: DateFormatter.editing)")
.font(.footnote)
}
Spacer()
Text("\(String(describing: tmpClaim.serviceAmount).currencyFormatting())")
}
.contextMenu {
Button(action:
{
// code to create a new claim is here
})
{
Text("Duplicate")
Image(systemName: "doc.on.doc")
}
}
}
}
.onDelete { indexSet in
for index in indexSet {
(UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext.delete(self.claims[index])
}
if (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext.hasChanges { …Run Code Online (Sandbox Code Playgroud)