1
NSError *error = nil;
NSMutableArray *mutableFetchResults = [[managedObjectContext executeFetchRequest:request error:&error] mutableCopy];
if (mutableFetchResults == nil)
{
// Handle the error.
}
// Set self's events array to the mutable array, then clean up.
[self setEventsArray:mutableFetchResults];
[mutableFetchResults release];
这些代码给出了运行时错误 “executeFetchRequest:error:
获取请求必须有一个实体”。 任何人都可以帮助解决这个错误executeFetchRequest:错误