nsscrollview可能不响应“-text”

I am having trouble assigning a NSString to the text of a NSScrollView. I have tried the following:

    NSString *medium = codeView.text;

That didn't work so then I tried:

    NSString *medium = [codeView text];

这仍然不起作用,它给了我警告:

nsscrollview可能没有响应 “文本”

Or in the case of the "." operator it gives me the error:

Request for member 'text' is something not a structure or union.

有人对如何解决这个问题有什么建议吗?

我按照以下方式初始化代码:

@interface NetCodeViewController : NSObject {
    IBOutlet NSTextView *codeView;
}
@property(nonatomic, retain) id *codeView;
@end