Linking problems with AppKit

Question

I've created a class using XCode3.2.1 and I want to make it inherit from NSViewController (or any other AppKit entity) .

#import < Cocoa/Cocoa.h>

@interface myCustomView : NSViewController {}

@end

I've linked in the Cocoa libraries, but I get the error that it can't find the class header file

Undefined symbols: "_OBJC_CLASS_$_NSViewController", referenced from:
    _OBJC_CLASS_$_myCustomView in myCustomView.o

I have other classes in my project that are inherit Cocoa classes without a problem. I don't have any errors if I make it inherit from classes that are part of Framework or CoreData (eg NSObject, NSArray, NSEntityDescription).

Any suggestions?

Answer 1

检查子类化的NSViewController实现文件是否处于活动目标的“编译源”构建阶段。

Answer 2

Somehow the some of the Frameworks become disconnected in XCode. Under if you control-click Frameworks and select GetInfo, it the box had a dash through it (meaning it was partially selected). Clicking it again activated it for all classes.