0
我正在描述Core Data圖中的一些顏色信息。該實體是一種顏色,屬性是顏色組件。如何刪除managedObject - 不是tableView
我在兩個方面掙扎:如何從圖形中刪除顏色對象,其次(獎金問題?),我怎麼能識別重複的顏色?
在我的AppDelegate,我有一個這樣的核心數據堆棧:
lazy var persistentContainer: NSPersistentContainer = {
let container = NSPersistentContainer(name: "DD")
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {
// Replacing this implementation with code to handle the error appropriately.
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
return container
}()
// MARK: - Core Data Saving support
func saveContext() {
print(#function)
let context = persistentContainer.viewContext
if context.hasChanges {
do {
try context.save()
} catch {
// Replace this implementation with code to handle the error appropriately.
// fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
let nserror = error as NSError
fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
}
}
}
,並在那裏我試圖刪除的顏色,我有這樣的:
func deleteColor(_ sender:UIButton) {
let i : Int = (sender.layer.value(forKey: "index")) as! Int
print(#function, "object to delete: ", i)
let managedContext = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
colors.remove(at: i)
do {
try managedContext.save()
} catch let error as NSError {
print("Error While Saving Data: \(error.userInfo)")
}
recentColorCollection!.reloadData()
}
變量是:
var colors = [RecentColorEntity]()
var colorEntity = "RecentColorEntity"
我沒有得到任何錯誤,但對象沒有被刪除..有人可以幫我弄清楚什麼我做錯了
謝謝先生!這就是訣竅!我會歡迎你的想法如何識別模糊(額外信貸..)謝謝 –
您發佈了一個新問題。 – Mundi
會做。再次感謝。 –