我有一个错误,其中标记错误//错误
db为空,我尝试附加Persistence记录,然后设置其值
tasks[0].persistencevalue = "Some Text"
!
任何帮助都将不胜感激。
由于
堆栈显示:
2017-08-18 10:09:07.158047 + 0100 Ontrack [6491:1684506] [错误]错误: CoreData:错误:无法调用指定的初始化程序 NSManagedObject类'持久' CoreData:错误:CoreData:错误:无法在NSManagedObject类上调用指定的初始化程序“Persistence”2017-08-18 10:09:08.678 Ontrack [6491:1684506] - [Persistence setPersistencevalue:]:无法识别的选择器发送到实例 0x60800026a040 2017-08-18 10:09:08.681 Ontrack [6491:1684506] ***由于未捕获的异常'NSInvalidArgumentException'终止应用程序,原因: ' - [Persistence setPersistencevalue:]:发送到的无法识别的选择器 实例0x60800026a040'
func Update() {
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
let app = (UIApplication.shared.delegate as! AppDelegate )
var tasks: [ Persistence] = []
let pers = Persistence()
tasks.append(pers)
cnt = tasks.count
// ERRORS HERE
tasks[0].persistencevalue = Rate.text!
// END ERROR
}
答案 0 :(得分:0)
感谢您的帮助,我能够使用以下代码解决问题。希望它可以帮助有同样问题的人。
func Update() {
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
let app = (UIApplication.shared.delegate as! AppDelegate )
var persistencies: [ Persistence]?
var cnt = persistencies?.count
var perRec: AnyObject! = NSEntityDescription.insertNewObject(forEntityName: "Persistence", into: context) as NSManagedObject
perRec.setValue(DbKeys.PERSISTENCE_SPEECHRATE_KEY, forKey: "persistencekey")
perRec.setValue(Rate.text, forKey: "persistencevalue")
do {
try context.save()
} catch {
print (" ERROR")
}
app.saveContext()
do {
persistencies = try context.fetch(Persistence.fetchRequest())
} catch {
print("Fetching Failed")
}
cnt = persistencies?.count
}