42、iOS Core Data 开发指南：从基础搭建到实体管理

iOS Core Data 开发指南：从基础搭建到实体管理

1. Core Data 栈的搭建

在 iOS 开发中使用 Core Data 前，需要搭建 Core Data 栈。以下是相关代码：

AppModel.h

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>

@interface AppModel : NSObject
-(NSURL *)dataStoreURL;
@property (nonatomic, strong, readonly) NSManagedObjectModel *managedObjectModel;
@property (nonatomic, strong, readonly) NSPersistentStoreCoordinator *persistentStoreCoordinator;
@property (nonatomic, strong, readonly) NSManagedObjectContext *managedObjectContext;
@end

AppModel.m

#import "AppModel.h"

@implementation AppModel
NSManagedObjectModel *_managedObjectModel;
NSPersistentSt