我想为我的 NSArrayController 子类编写一些单元测试。
我首先设置一个 Core Data 托管对象上下文，然后将实体“Asset”的一些对象添加到核心数据，然后设置我的数组 Controller :
@interface MYAssetArrayControllerTest : XCTestCase
...
- (void)setUp
{
[super setUp];
[self setUpManagedObjectContext];
[self setUpAssets];
[self setUpMYAssetArrayController];
}
- (void)setUpMYAssetArrayController
{
_arrayController = [[MYAssetArrayController alloc] init];
[_arrayController setManagedObjectContext:_moc];
[_arrayController setEntityName:@"Asset"];
[_arrayController setSelectsInsertedObjects:YES];
[_arrayController setAutomaticallyPreparesContent:YES];
[_arrayController fetch: self];
}
当我尝试查看排列的对象时，没有:
- (void)testGetArrangedObjects
{
id myArrangedObjects;
myArrangedObjects = [_arrayController arrangedObjects];
...
}
myArrangedObjects 始终为空...
我必须如何设置 NSArrayController 才能从中检索对象？
最佳答案
当我不发送 fetch: 而是 fetchWithRequest:merge:error: 到我的数组 Controller 时，我发现它有效。我的原始代码:
- (void)setUpMYAssetArrayController
{
_arrayController = [[MYAssetArrayController alloc] init];
[_arrayController setManagedObjectContext:_moc];
[_arrayController setEntityName:@"Asset"];
[_arrayController setSelectsInsertedObjects:YES];
[_arrayController setAutomaticallyPreparesContent:YES];
[_arrayController fetch: self];
}
变成:
- (void)setUpMYAssetArrayController
{
_arrayController = [[MYAssetArrayController alloc] init];
[_arrayController setManagedObjectContext:_moc];
[_arrayController setEntityName:@"Asset"];
[_arrayController setSelectsInsertedObjects:YES];
[_arrayController setAutomaticallyPreparesContent:YES];
NSError *error = nil;
BOOL ok = [_arrayController fetchWithRequest:nil merge:NO error:&error];
}
也许以下对 -fetch 的注释可能是一个解释？
Beginning with OS X v10.4 the result of this method is deferred until the next iteration of the runloop so that the error presentation mechanism can provide feedback as a sheet.
关于objective-c - 如何对 NSArrayController (子类)进行单元测试？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25312583/