web-dev-qa-db-ja.com

Swift：コアデータを配列として取得する

Sqliteテーブルのすべての保存データを取得したい。

私は現在これをやっています：

 func GetAllData() -> NSArray
{
    var error : NSError? = nil;
    var request : NSFetchRequest = NSFetchRequest(entityName: "Locations");
    let result : [AnyObject] = managedObjectContext!.executeFetchRequest(request, error:&error)!;
      var elements : NSMutableArray = NSMutableArray();
    for fetchedObject in result
    {
        elements.addObject(fetchedObject[0]);
    }
    print(elements);
    return elements;
}

Objective-Cでデータを取得するのに問題はありませんが、Swift取得できません！

データの保存は正常に機能します。 「名前」と「カテゴリ」の2つの行があります。保存されたすべてのデータを表示するにはどうすればよいですか？

iossqlitecore-dataswift
17
TdoubleG

Swift

func fetchData(){

    onlyDateArr.removeAll()
    let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
    let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "PhotoData")

    do {
        let results = try context.fetch(fetchRequest)
        let  dateCreated = results as! [PhotoData]

        for _datecreated in dateCreated {
            print(_datecreated.dateCreation!)
            onlyDateArr.append(_datecreated)
        }
    }catch let err as NSError {
        print(err.debugDescription)
    }


}
7
Abdul Karim

これを試して：

let fetchRequest = NSFetchRequest(entityName: "Locations")

 do {
     let results = try managedObjectContext.executeFetchRequest(fetchRequest)
     let  Locations = results as! [Locations]

     for location in Locations {
        println(location)   
     }
    } catch let error as NSError {
       print("Could not fetch \(error)”)
 }
7
Vikram Biwal
import UIKit
import CoreData
class CoreDataHandler: NSObject {

    private class func getContext() -> NSManagedObjectContext
    {
        let delegate = UIApplication.shared.delegate as? AppDelegate

        return (delegate?.persistentContainer.viewContext)!
    }


    class func saveObeject (name:String,roll:String,college:String)
    {
        let context =  getContext()
        let entity = NSEntityDescription.entity(forEntityName: "CountryInfo", in: context)

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

        manageObjet.setValue(name, forKey: "name")
        manageObjet.setValue(roll, forKey: "roll")
        manageObjet.setValue(college, forKey: "college")


        do
        {
            try context.save()
        }catch
        {
            print("unable to save data")
        }
    }

    class func getCountryDetail(name:String) ->Array<Any>?
    {

        // return "http://1.bp.blogspot.com/-J9emWhBZ_OM/TtQgVQmBHRI/AAAAAAAAD2w/j7JJMRMiuAU/s1600/Al_Ain_FC.png"
        let contecxt = getContext()
        let fetchRequest:NSFetchRequest<CountryInfo> = CountryInfo.fetchRequest()

        var user:[CountryInfo] = []
        let predicate = NSPredicate(format: "name LIKE[cd] %@",name)
        fetchRequest.predicate = predicate
        do{
            user =  try contecxt.fetch(fetchRequest)
            let ClubInfoBO = user
            print(ClubInfoBO)
            return (ClubInfoBO) as? Array<Any>
        }catch
        {
            return nil

        }

    }


    class func deleteObject(user:CountryInfo) ->Bool{
        let context = getContext()
        context.delete(user)
        do
        {
            try context.save()
            return true
        }catch{
            return false
        }
    }

    //Clean delete

    class func cleanDelete () ->Bool
    {
        let context = getContext()
        let delete = NSBatchDeleteRequest(fetchRequest: CountryInfo.fetchRequest())

        do{
            try context.execute(delete)
            return true
        }catch
        {
            return false
        }
    }
}
1
user9476144