NSManagedObjectContext

NSManagedObjectContext

本文介绍了NSManagedObject是否保留其NSManagedObjectContext?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

的访问, ?



根据, NSManagedObject 保留对其 NSManagedObjectContext 在内部,我们可以访问它。



Zarra如何知道这一点,
$ b

我问,因为我想知道 NSManagedObjectContext 是否 dealloc tearDown 方法中。 (我使用。)

  #import< SenTestingKit / SenTestingKit.h> 
#import< CocoaPlant / CocoaPlant.h>

#importAccountUser.h

@interface AccountUserTests:SenTestCase {
AccountUser * accountUser;
}
@end

@implementation AccountUserTests

- (void)setUp {
accountUser = [AccountUser insertIntoManagedObjectContext:
[NSManagedObjectContext contextWithStoreType:NSInMemoryStoreType error:NULL]];
}

- (void)tearDown {
[accountUser delete];
}

- (void)testFetchWithLinkedAccountUserID {
//测试到这里...
}

@end

NSManagedObject不会强制引用其NSManagedObjectContext。

我检查了一个测试项目。
因此,只要你使用它的对象,你应该保持对NSManagedObjectContext的强引用。


NSManagedObject provides access to its NSManagedObjectContext, but does it retain it?

According to "Passing Around a NSManagedObjectContext on iOS" by Marcus Zarra, "The NSManagedObject retains a reference to its NSManagedObjectContext internally and we can access it."

How does Zarra know this and is he correct?

I'm asking because I want to know if the NSManagedObjectContext will be dealloc'ed in the tearDown method below. (I'm using CocoaPlant.)

#import <SenTestingKit/SenTestingKit.h>
#import <CocoaPlant/CocoaPlant.h>

#import "AccountUser.h"

@interface AccountUserTests : SenTestCase {
    AccountUser *accountUser;
}
@end

@implementation AccountUserTests

- (void)setUp {
    accountUser = [AccountUser insertIntoManagedObjectContext:
                   [NSManagedObjectContext contextWithStoreType:NSInMemoryStoreType error:NULL]];
}

- (void)tearDown {
    [accountUser delete];
}

- (void)testFetchWithLinkedAccountUserID {    
    // Tests go here...
}

@end
解决方案

NSManagedObject DOES NOT hold strong reference to its NSManagedObjectContext. I've checked that on a test project.Therefore, you should keep strong reference to NSManagedObjectContext as long as you use its objects.

这篇关于NSManagedObject是否保留其NSManagedObjectContext?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

10-14 02:50