我在从核心数据中提取我的对象时遇到问题。对象是这样的:从核心数据中将自定义对象提取到数组中
class cilj: NSObject {
var imeCilja: String
var slikaCilja: String }
我的实体被称为实体,并有两个属性“tekst”和“SLIKA”,无论是String类型。我保存FUNC是这样的:
func saveImage(goalName:String, imageName:String) {
let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let managedContext = appDelegate.managedObjectContext
let entityDescription = NSEntityDescription.entityForName("Entity", inManagedObjectContext:managedContext)
let thingToSaveToCD = NSManagedObject(entity: entityDescription!, insertIntoManagedObjectContext: managedContext)
thingToSaveToCD.setValue(globalGoalTitle, forKey: "tekst")
thingToSaveToCD.setValue(globalGoalImagePath, forKey: "slika")
do {
try managedContext.save()
print("managed to save to core data")
//5
// listaObjekata.append(cilj5) as! [cilj]
} catch let error as NSError {
print("Could not save \(error), \(error.userInfo)")
}
}
我使用alertController拿起文本,imagePicker拿起形象,我再在文件存储和获取路径。我将这两个存储在上面代码中可见的全局变量中。
我取功能是:
func coreDataFetch(){
//core data fetch
//1
let appDelegate =
UIApplication.sharedApplication().delegate as! AppDelegate
let managedContext = appDelegate.managedObjectContext
//2
let fetchRequest = NSFetchRequest(entityName: "Entity")
do {
let fetchedResults = try managedContext.executeFetchRequest(fetchRequest) as! [cilj]
listaObjekata = fetchedResults
} catch let error as NSError {
print("Could not fetch \(error), \(error.userInfo)")
}
}
我已经通过射线wenderlich对核心数据,苹果的文档,一对夫妇的YT影片,但文章中,我似乎仍然失去了一些东西。我将不胜感激任何帮助。谢谢 !
编辑 - 这是我的cellForRowAtIndexPath
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("myCell") as! cellController
let ciljZaPrikaz = listaObjekata[indexPath.item]
cell.labelText.text = ciljZaPrikaz.imeCilja ?? "no text found"
let path = getDocumentsDirectory().stringByAppendingPathComponent(ciljZaPrikaz.slikaCilja)
cell.imageToShow.image = UIImage(contentsOfFile: path)
return cell
}
你试试这个? 'let fetchedResults =尝试managedContext.executeFetchRequest(fetchRequest)as! [实体]' – Santosh
嘿,是的,我有,然后它在它下面的线上说“不能指定类型[实体]类型的值键入[cilj]。 – user3739902
您正在使用'Entity'进行保存并用'Entity'进行提取,然后为什么数组是'[cilj]'?只要尝试打印'fetchedResults'并检查你所得到的结果是什么?删除'as![Entity]'或'as![cilj]'并尝试。 – Santosh