为什么我的 Objective C 实现文件无法识别我的导入语句
这是我的头文件
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import <PolygonShape.h>
@interface Controller : NSObject {
IBOutlet UIButton *decreaseButton;
IBOutlet UIButton *increaseButton;
IBOutlet UILabel *numberOfSidesLabel;
//IBOutlet PolygonShape *shape;
}
- (IBAction)decrease;
- (IBAction)increase;
@end
这是我的实现文件
#import "Controller.h"
@implementation Controller
- (IBAction)decrease {
//shape.numberOfSides -= 1;
}
- (IBAction)increase {
//shape.numberOfSides += 1;
}
@end
为什么我的 #import "Controller.h" 行出现以下错误？
error: PolygonShape.h: No such file or directory
PolygonShape.h 和 .m 文件与 Controller 类位于同一项目和同一目录中。
Here is my header file
#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import <PolygonShape.h>
@interface Controller : NSObject {
IBOutlet UIButton *decreaseButton;
IBOutlet UIButton *increaseButton;
IBOutlet UILabel *numberOfSidesLabel;
//IBOutlet PolygonShape *shape;
}
- (IBAction)decrease;
- (IBAction)increase;
@end
Here is my implementation file
#import "Controller.h"
@implementation Controller
- (IBAction)decrease {
//shape.numberOfSides -= 1;
}
- (IBAction)increase {
//shape.numberOfSides += 1;
}
@end
Why am I getting the following error on my #import "Controller.h" line?
error: PolygonShape.h: No such file or directory
The PolygonShape.h and .m files are in the same project and in the same directory as the Controller class.
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尖括号 (
<>) 表示该文件位于标准包含路径中，例如 /usr/include 或 /System/Library/Frameworks。 要导入相对于当前目录的文件，您需要像在#import "Controller.h"中那样使用双引号。The angle braces (
<>) mean that the file is in a standard include path, such as /usr/include or /System/Library/Frameworks. To import a file relative to the current directory, you need to use double-quotes like you do in#import "Controller.h".系统头文件使用<>。 你的头文件应该使用“”。
所以应该是：
您可能想在头文件中使用 @class PolygonShape 并在实现中进行导入。
System header files use <>. Your header files should use "".
So it should be:
And you might want to use @class PolygonShape in your header file and do the import in your implementation.
如果你在B中导入A类，然后在A中导入B类，你会得到这个错误
If you import class A in B and then import class B in A you will get this error