保存和检索数字的问题

Question

我正在使用CoreData的应用程序。

我是强大的数字并检索它们，但是当我存储多个字段时，它只显示数字的最后一个字段，但是在其他字段中显示为0。下面是我的代码。

来存储他们...

let CWConvert = Double(CWeight.text!) 
          storeTranscription18CW(pageText: (CWConvert)!, textFileUrlString: "cWeight") 
           savePlus += 1 


          let TWConvert = Double(TWeight.text!) 
          storeTranscription18TW(pageText: (TWConvert)!, textFileUrlString: "tWeight") 

和...

 func getContext() -> NSManagedObjectContext { 
    _ = UIApplication.shared.delegate as! AppDelegate 
    return DataController().managedObjectContext 
} 


func storeTranscription18CW (pageText: Double, textFileUrlString: String) { 


    let context = getContext() 

    //retrieve the entity that we just created 
    let entity = NSEntityDescription.entity(forEntityName: "TextInputs", in: context) 

    let transc = NSManagedObject(entity: entity!, insertInto: context) 

    // set the entity values 

     transc.setValue(pageText, forKey: "cWeight") 

    //save the object 
    do { 
     try context.save() 
     print("saved!") 
    } catch let error as NSError { 
     print("Could not save \(error), \(error.userInfo)") 
    } catch { 

    } 
} 


func storeTranscription18TW (pageText: Double, textFileUrlString: String) { 
    let contexta = getContext() 

    //retrieve the entity that we just created 
    let entitya = NSEntityDescription.entity(forEntityName: "TextInputs", in: contexta) 

    let transc = NSManagedObject(entity: entitya!, insertInto: contexta) 

    // set the entity values 

     transc.setValue(pageText, forKey: "tWeight") 

    //save the object 
    do { 
     try contexta.save() 
     print("saved!") 
    } catch let error as NSError { 
     print("Could not save \(error), \(error.userInfo)") 
    } catch { 

    } 
} 

，并以检索。

func getTranscriptions18CW() { 
    //create a fetch request, telling it about the entity 
    let fetchRequesta: NSFetchRequest<TextInputs> = TextInputs.fetchRequest() 
    do { 
     //go get the results 
     let searchResults18CW = try getContext().fetch(fetchRequesta) 

      for transa in searchResults18CW as [NSManagedObject] { 
       if let resulta = transa.value(forKey: "cWeight") { 
        if let stra = resulta as? String { 
         CWeight.text = stra 
        }else { 
         CWeight?.text = "\(resulta)" 
        } 
       } 
      } 
      //get the Key Value pairs (although there may be a better 
    }catch { 
     print("Error with request: \(error)") 
    } 
} 

func getTranscriptions18TW() { 
    //create a fetch request, telling it about the entity 
    let fetchRequest: NSFetchRequest<TextInputs> = TextInputs.fetchRequest() 
    do { 
     //go get the results 
     let searchResults18TW = try getContext().fetch(fetchRequest) 

      for trans in searchResults18TW as [NSManagedObject] { 
       if let result = trans.value(forKey: "tWeight") { 
        if let str = result as? String { 
         TWeight.text = str 
        }else { 
         TWeight?.text = "\(result)" 

       } 
      } 
      //get the Key Value pairs (although there may be a better way to do that... 
     } 
    }catch { 
     print("Error with request: \(error)") 
    } 
} 

我已经尝试不同的名称，但得到相同的只显示最后一个为实数，如果我时刻了最后一个，则第一个显示的实际价值。

Answer 1

尝试更多的东西像这样保存，让你在同一行无论是在节约。

func storeTranscription18TW() { 
    let contexta = getContext() 

    //retrieve the entity that we just created 
    let entitya = NSEntityDescription.entity(forEntityName: "TextInputs", in: contexta) 

    let transc = NSManagedObject(entity: entitya!, insertInto: contexta) 

    // set the entity values 
    transc.setValue(CWConvert, forKey: "cWeight") // Note the change from pageText 
    transc.setValue(TWConvert, forKey: "tWeight") // Note the change from pageText 

    //save the object 
    do { 
     try contexta.save() 
     print("saved!") 
     } catch let error as NSError { 
      print("Could not save \(error), \(error.userInfo)") 
     } catch { 

    } 
} 

然后当你做一个get的时候，它们都会在同一个函数中完成。