核心数据条件

Question

我需要添加核心数据条件我该怎么做？ 。如果记录是在这种情况下， “sonuc” 变量将是真正的

核心数据模型：

如果 “kullaniciadi” 是 “埃姆雷” 和 “otogiris” 为“1 “那么 ”sonuc“ 将 是真的

func getContext() -> NSManagedObjectContext { 
     let appDelegate = UIApplication.shared.delegate as! AppDelegate 
     if #available(iOS 10.0, *) { 
      return appDelegate.persistentContainer.viewContext 
     } else { 
      return DatabaseController.managedObjectContext 
     } 
    } 



func otomatikGirisKontrol() -> Bool 
    { 
     var sonuc = false 
     let fetchRequest:NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: "Kullanicilar") 
     fetchRequest.returnsObjectsAsFaults = false 
     do{ 
      let results = try getContext().fetch(fetchRequest) 
      if results.count > 0 
      { 
      sonuc = true 
      } 
      else 
      { 
      sonuc = false 
      } 

     } 
     catch 
      { 

      } 
     return (sonuc) 
    } 

Answer 1

使用NSPredicate只取符合您的条件的物品：

let fetchRequest = ... 

let kullaniciadi = "emre" 
let otogiris = "1" 
let predicate = NSPredicate(format: "kullaniciadi = %@ AND otogiris = %@", kullaniciadi, otogiris) 

request.predicate = predicate 

//... execute fetch request