xcode 预期标识符或 '(' 在 '.' 标记之前
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Expected identifier or '(' before '.' token
提问by Zachary Markham
I'm new to Objective-C so I'm using a book to get to grips with it. I'm at a bit where it's explaining structs and I can't for the life of me get them to work.
我是 Objective-C 的新手，所以我正在使用一本书来掌握它。我有点在解释结构，我一生都无法让它们工作。
I have the following code:
我有以下代码：
int main (int argc, char *argv[])
{
struct node
{
int nodeID;
int x;
int y;
BOOL isActive;
};
typedef struct node myNode;
myNode.nodeID = 1;
}
and I'm getting the error written in the title. Every time I search for this error online I found different variations such as 'before '>' token' or 'before '}' token' but i can't find anything with the '.' token and it's really frustrating and I assume it's somethings ridiculously trivial and basic. Any help would be appreciated.
我收到了标题中写的错误。每次我在网上搜索此错误时，我都会发现不同的变体，例如“before '>' token”或“before '}' token”，但我找不到任何带有 '.' 的内容。令牌，这真的很令人沮丧，我认为这是非常琐碎和基本的事情。任何帮助，将不胜感激。
采纳答案by Zachary Markham
I've got it sorted now, I used the following and it seems to be fixed now:
我现在已经整理好了，我使用了以下内容，现在似乎已修复：
int main (int argc, char *argv[])
{
struct node
{
int nodeID;
int x;
int y;
BOOL isActive;
};
struct node myNode;
myNode.nodeID = 1;
myNode.x = 100;
myNode.y = 200;
myNode.isActive = TRUE;
}
Thanks for all your help Darth! :)
感谢您对达斯的所有帮助！:)
回答by
I believe you're trying to modify the actual type itself. nodeAis now the type of that struct, much like int. You need to do something like nodeA myNode, then you would be able to perform myNode.nodeID = 1without error.
我相信您正在尝试修改实际类型本身。nodeA现在是该结构的类型，很像int. 你需要做一些类似的事情nodeA myNode，然后你就可以毫无错误地执行myNode.nodeID = 1。
回答by RAX
I think the problem with the original code was, it was trying to make myNode a type name using typedef. Thus, myNode is NOT a variable that assignment can happen to. Rather, it was another alias for struct node.
我认为原始代码的问题是，它试图使用 typedef 使 myNode 成为类型名称。因此， myNode 不是一个可以赋值的变量。相反，它是 struct node 的另一个别名。
