Question

我是Core Data的新手。需要保存文本字段的值。我做了：

Model.xcdatamodeld：“Entity” - ＆gt; “attribute”（整数32）;

编写代码但我不确定：

//ViewController.h
@property (weak, nonatomic) IBOutlet UITextField *textOutlet;
@property (readonly, strong, nonatomic) NSManagedObjectContext *managedObjectContext;
@property (readonly, strong, nonatomic) NSManagedObjectModel *managedObjectModel;
@property (readonly, strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;

//ViewController.m
    -(id)init{

        NSString *const kDtabaseFileName=@"file.sqlite";
        NSArray *paths=NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory,NSUserDomainMask, YES);
        NSString *documentsDirectory=[paths objectAtIndex:0];
        NSString *databasePath=[documentsDirectory stringByAppendingPathComponent:kDtabaseFileName];

        NSManagedObjectModel *managedObjectModel=[NSManagedObjectModel mergedModelFromBundles:nil];
        NSPersistentStoreCoordinator *persistentStoreCoordinator=[[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:managedObjectModel];
        [persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:[NSURL URLWithString:databasePath] options:nil error:nil];
        NSManagedObjectContext *managedObjectContext=[[NSManagedObjectContext alloc]init];
        managedObjectContext.persistentStoreCoordinator=persistentStoreCoordinator;
        self.managedObjectContext=managedObjectContext;

        return self;
    }

下一步做什么？

Answer 1

MyObject *myObject = [NSEntityDescription insertNewObjectForEntityForName:@"MyObject" inManagedObjectContext:self.managedObjectContext];

myObject.field = anything;

也许这些代码行可以提供帮助

如何在核心数据中保存文本字段的值？

1 个答案: