问题未知类型名称NSManagedObject

Question

我正在努力拥有一个非常简单的核心数据。我有一个像这样的ViewController.h：

#import <UIKit/UIKit.h>

@interface ViewController : UIResponder <UIApplicationDelegate>;

@property (readonly, strong, nonatomic) NSManagedObjectContext *managedObjectContext;
@property (readonly, strong, nonatomic) NSManagedObjectModel *managedObjectModel;
@property (readonly, strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator;

- (IBAction)boutonSave:(id)sender;

@end

和ViewController.m一样：

#import "ViewController.h"

@implementation ViewController

@synthesize managedObjectContext = __managedObjectContext;
@synthesize managedObjectModel = __managedObjectModel;
@synthesize persistentStoreCoordinator = __persistentStoreCoordinator;

- (IBAction)boutonSave:(id)sender {
ViewController *viewController = [[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [viewController managedObjectContext];
NSManagedObject *newJournee; //THIS LINE IN ERROR
newJournee = [NSEntityDescription insertNewObjectForEntityForName:@"JourneeDeTravail" inManagedObjectContext:context];
[newJournee setValue:_displayStart.text forKey:@"debut"];
[newJournee setValue:_displayEnd.text forKey:@"fin"];    

}

但是在创建newJournee时，我有一个红色警告“未知类型名称'NSManagedObject'，你的意思是NSManagedObjectModel？” ???这是我的第一个核心数据，所以我当然错过了一些对你来说显而易见的东西......但不是我！帮助！

Answer 1

添加CoreData.framework并导入如下

#import <CoreData/CoreData.h>

希望它有所帮助〜

Answer 2

听起来你错过了#import

Answer 3

别担心。一切似乎都很好......

只做一件事。转到你的ViewController.m文件并添加这一行。

#import "ViewController.h"
#import <CoreData/CoreData.h>

@implementation ViewController

@synthesize managedObjectContext = __managedObjectContext;
@synthesize managedObjectModel = __managedObjectModel;
@synthesize persistentStoreCoordinator = __persistentStoreCoordinator;

- (IBAction)boutonSave:(id)sender {
ViewController *viewController = [[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [viewController managedObjectContext];
NSManagedObject *newJournee; //Error removed
newJournee = [NSEntityDescription insertNewObjectForEntityForName:@"JourneeDeTravail" inManagedObjectContext:context];
[newJournee setValue:_displayStart.text forKey:@"debut"];
[newJournee setValue:_displayEnd.text forKey:@"fin"];

希望这会有所帮助。