进行循环引用导入时出错
我的程序运行良好，但我更改了一些内容，现在它有超过 48 个错误。
我想我知道问题所在，但我不知道如何解决。我创建了一个名为 mViewBase 的类，供我的所有 UIViewController 派生。
我决定在所有视图的底部有一个导航栏，以转到名为 cakes2 的其他视图控制器。所以 cakes2.h 导入 mViewBase，并且 mViewBase import cakes2.h
您必须能够在 Objective-C 中执行此操作。有人知道我能做什么吗？
我的 mViewBase.h 文件：
#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
我的 Cakes2.h 文件：
#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
My program was running fine, but I changed something and now it has over 48 errors.
I think I know the problem, but I don't know how to fix it. I created a class called mViewBase for all my UIViewControllers to derive from.
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
You must be able to do this in Objective-C. Does anybody have any idea of what I can do?
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 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
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您可以在一个头文件中使用前向声明，以避免导入另一个头文件。例如，在mViewBase.h中，您可以说：
现在编译器知道“Cakes2”引用一个类，并且您不需要导入整个Cakes2.h文件。
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:
Now the compiler knows that "Cakes2" refers to a class, and you don't need to import the entire Cakes2.h file.
我认为您也许应该考虑使用
UITabBarController。它是专门为从屏幕底部的栏管理多个视图控制器而设计的。I think you should perhaps consider using a
UITabBarController. It is made specifically for managing several view controllers from a bar at the bottom of the screen.