Question

我试图在OSX上编写和读取CoreData，使用applescript-objc组合可可类。我编写了处理我的CoreData的方法，如教程（youtube, Cocoa Tutorial: Core Data Introduction in iOS and Mac OS Programming Part 2）＆lt; - 那些是我项目中的可可类

我有一个名为CoreDataHelper的类，它定义了操作Core Data的方法。以下是其中一些：

+(NSManagedObjectContext *) managedObjectContext{
    NSError*error;
    [[NSFileManager defaultManager] createDirectoryAtPath:[CoreDataHelper directoryForDatabaseFilename] withIntermediateDirectories:YES attributes:nil error:&error];

    if(error){
        NSLog(@"%@", [error localizedDescription]);
        return nil;
    }

    NSString* path = [NSString stringWithFormat:@"%@/%@",[CoreDataHelper directoryForDatabaseFilename],[CoreDataHelper databaseFilename]];
    NSURL *url = [NSURL fileURLWithPath:path];
    NSManagedObjectModel* managedModel = [NSManagedObjectModel mergedModelFromBundles:nil];
    NSPersistentStoreCoordinator* storeCordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:managedModel];

    if(![storeCordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:url options:nil error:&error]){
        NSLog(@"%@",[error localizedDescription]);
        return nil;
    }

    NSManagedObjectContext* managedObjectContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];

    return managedObjectContext;
}


+(id)insertManagedObjectOfClass:(Class) aClass inManagedObjectContext:(NSManagedObjectContext *)managedObjectContext{
    NSManagedObject* managedObject = [NSEntityDescription insertNewObjectForEntityForName:NSStringFromClass(aClass) inManagedObjectContext:managedObjectContext];

    return managedObject;
}

我在我的模型中使用.xcdatamodeld。我有2个实体，每个实体都有一个类：

标签
服务

Tab.h看起来像这样

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

@class Service;

NS_ASSUME_NONNULL_BEGIN

@interface Tab : NSManagedObject

// Insert code here to declare functionality of your managed object subclass

@end

NS_ASSUME_NONNULL_END

#import "Tab+CoreDataProperties.h"

和Tab.m看起来像这样：

#import "Tab.h"
#import "Service.h"

@implementation Tab

// Insert code here to add functionality to your managed object subclass

@end

标签+ CoreDataProperties.h：

 #import "Tab.h"

    NS_ASSUME_NONNULL_BEGIN

    @interface Tab (CoreDataProperties)

    @property (nullable, nonatomic, retain) NSString *nZakladka;
    @property (nullable, nonatomic, retain) NSString *uZakladka;
    @property (nullable, nonatomic, retain) Service *podstronaSerwisu;

    @end

    NS_ASSUME_NONNULL_END

标签+ CoreDataProperties.m： #import＆＃34; Tab + CoreDataProperties.h＆＃34;

@implementation Tab (CoreDataProperties)

@dynamic nZakladka;
@dynamic uZakladka;
@dynamic podstronaSerwisu;

@end

现在，我的AppDelegate.applescript看起来像这样

...

property CoreDataHelper: class "CoreDataHelper"
property cService: class "Service"
property cTab: class "Tab"

script AppDelegate

  on applicationWillFinishLaunching_(aNotification)

    set theContext to CoreDataHelper's managedObjectContext() 
    set ccTab to cTab's alloc()'s init()

    //the one below cause an error "CoreData: error: Failed to call designated initializer on NSManagedObject class 'Tab'"
    set theTab to CoreDataHelper's insertManagedObjectOfClass_inManagedObjectContext_(ccTab, theContext)

  end applicationWillFinishLaunching_

...

end Script

当我运行整件事时，我在AppleScriptObjC代码的注释行中发布了一条错误消息。导致错误的方法是NSManagedObject* managedObject = [NSEntityDescription insertNewObjectForEntityForName:NSStringFromClass(aClass) inManagedObjectContext:managedObjectContext]; 有什么问题？

在AppleScript-objc中初始化CoreData

0 个答案: