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];
這些代碼給出了運行時錯誤 「executeFetchRequest:error:
獲取請求必須有一個實體」。 任何人都可以幫助解決這個錯誤executeFetchRequest:錯誤