objective-c - nsmutabledictionary 没有可见接口声明选择器 setobject:forkey：

Question

谁能指出我为什么会收到编译错误

[objToSend setObject:self.pathidEdit forkey:@"PathId"];
[objToSend setObject:indexData forkey:@"data"];

在下面的代码中？

NSMutableArray *indexData = [[NSMutableArray alloc]init];

        NSMutableDictionary *dict = [NSMutableDictionary dictionary];
        NSMutableDictionary *objToSend = [NSMutableDictionary dictionary];

        for(int i=0;i<myPathvideoArray.count;i++)
        {


        NSString *vId=[[myPathvideoArray objectAtIndex:i]valueForKey:@"videoId"];
    NSNumber *indexNum = [NSNumber numberWithInt:i+1];

            [dict setObject:vId forKey: @"VideoId"];

            [dict setObject:indexNum forKey: @"index"];

            [indexData addObject:dict];



        }

        [objToSend setObject:self.pathidEdit forkey:@"PathId"];
        [objToSend setObject:indexData forkey:@"data"];

Answer 1

Objective-C 区分大小写：

这是对的：

[dict setObject:object forKey:key];

虽然这不是：

[dict setObject:object forkey:key];