iphone - 从 coredata 对象读取

Question

我正在尝试获取已保存到核心数据对象中的值，但是出现此错误

Use of undeclared identifier 'error'

这指向我在下面的代码和平中引用和错误的地方

// Test listing all FailedBankInfos from the store
        NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
        NSEntityDescription *entity = [NSEntityDescription entityForName:@"Manuf" inManagedObjectContext:context];
        [fetchRequest setEntity:entity];

NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
        for (Manuf *manuf in fetchedObjects) {

           // Log all of the values in the object  

        }

任何帮助，将不胜感激

Answer 1

您需要先声明错误，然后再将引用传递到executeFetchRequest.

像这样：

NSError *error;