进行循环引用时出错 [英] Errors when making circular reference imports
问题描述
我的程序运行正常,但我改变了一些东西,现在有超过48个错误。
My program was running fine, but I changed something and now it has over 48 errors.
我想我知道问题,但我不知道修复它。我为所有的 UIViewController
创建了一个名为 mViewBase
的类。
I think I know the problem, but I don't know how to fix it. I created a class called mViewBase
for all my UIViewController
s to derive from.
我决定在我的所有视图的底部有一个导航栏,去其他视图控制器 cakes2
。 so cakes2.h import mViewBase
和 mViewBase
import cakes2.h
I decided to have a navigtion bar at the bottom of all my views, to go to other view controllers called cakes2
. So cakes2.h imports mViewBase
, and mViewBase
import cakes2.h
你必须能够在Objective-C中做到这一点。有没有人知道我可以做什么?
You must be able to do this in Objective-C. Does anybody have any idea of what I can do?
我的mViewBase.h文件:
My mViewBase.h file:
#import <UIKit/UIKit.h>
#import "Cakes2.h"
@interface mViewBase : UIViewController {
UIView *mBackground;
UIView *mBackArrow;
UITextView *mTitle;
// Cakes2 *mCakes;
}
-(void) aSetTitle: (NSString *) NewTitle;
-(IBAction) aBack: (id) tender;
-(IBAction) aHome: (id) sender;
-(IBAction) aCakes: (id) sender;
-(IBAction) aCall: (id) sender;
-(IBAction) aDirections: (id) sender;
@end
My Cakes2.h文件:
My Cakes2.h file:
#import <UIKit/UIKit.h>
#import "Gallery.h"
#import "WebView.h"
#import "mViewBase.h" // Circular reference! But I need it
@interface Cakes2 : mViewBase <UITableViewDelegate, UITableViewDataSource> {
// Gallery *mGallery;
IBOutlet UITableView *mMenu;
// WebView *mWebView;
}
-(IBAction) aOpenWeb;
@end
推荐答案
声明在您的一个头文件中,以避免需要导入其他头。例如,在mViewBase.h中,您可以说:
You can use a forward declaration in one of your header files to avoid the need to import the other header. For example, in mViewBase.h, you can say:
@class Cakes2;
现在编译器知道Cakes2是指一个类,整个Cakes2.h文件。
Now the compiler knows that "Cakes2" refers to a class, and you don't need to import the entire Cakes2.h file.
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