Core Data 更新某条指定记录数据

一：流程

• 同样需要先查询出指定记录
• 更新指定记录

二：代码：

//更新操作

- (void)updateThePersonData
{
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    [fetchRequest setEntity:[NSEntityDescription entityForName:@"Entity" inManagedObjectContext:self.appDelegate.managedObjectContext]];

    //更新谁的条件在这里配置；
    NSString *theName = @"uptest";
    [fetchRequest setPredicate:[NSPredicate predicateWithFormat:@"name==%@", theName]];

    NSError* error = nil;
    NSArray* results = [self.appDelegate.managedObjectContext executeFetchRequest:fetchRequest error:&error];

    if (results.count > ) {
        NSLog(@"%@",results);
        Entity *entiy = [results objectAtIndex:];
        entiy.address = @"your address is update to JiNan";
    }
}

上图代码：把 指定名为 uptest的 记录的 地址，更新为 your address is update to JiNan

参考：http://stackoverflow.com/questions/10571786/how-to-update-existing-object-in-core-data